NEOKYRU Educational Tools & STEM Solvers

Basic Calculator

Standard arithmetic calculations with memory store, decimal precision, and history tape

Average Calculator

Calculate arithmetic mean, median, mode, range, and geometric mean from numbers

Fraction Calculator

Add, subtract, multiply, and divide fractions with common denominator steps and reduction

Fraction Simplifier

Reduce fractions to simplest irreducible form and convert improper to mixed numbers

Percentage Calculator

Calculate percentages, percentage change, markups, and discounts with steps

Ratio Calculator

Solve missing proportion terms (A:B = C:D), simplify ratios, and scale dimensions

Algebra Calculator

Evaluate polynomials, expand binomial products using FOIL, and compute power-rule derivatives

Equation Solver

Solve single-variable equations and 2x2 simultaneous linear systems via Cramer’s Rule

Linear Equation Solver

Solve linear equations ax + b = c with isolated steps and variable solutions

Quadratic Equation Solver

Calculate real and complex roots, discriminant, and parabola vertex for ax² + bx + c = 0

Factoring Calculator

Find all integer factors, factor pairs, and canonical prime factor trees with exponents

Exponent Calculator

Calculate powers, negative exponents, fractional powers, and scientific notation

Logarithm Calculator

Calculate natural logarithm ln(x), common log₁₀(x), binary log₂(x), and arbitrary base log_b(x)

Geometry Calculator

Calculate 2D areas, perimeters, 3D volumes, and surface areas across geometric shapes

Triangle Calculator

Calculate triangle area via Heron’s formula, interior angles via Law of Cosines, and perimeter

Circle Calculator

Calculate circle radius, diameter, circumference, surface area, arc length, and sector area

Area Calculator

Calculate 2D surface area for rectangles, squares, triangles, circles, trapezoids, and ellipses

Volume Calculator

Calculate 3D volume and total surface area for cubes, prisms, cylinders, spheres, and cones

Pythagorean Calculator

Solve right triangles using a² + b² = c² with exact simplified radicals and decimal values

Trigonometry Calculator

Calculate sin, cos, tan, csc, sec, cot, and inverse functions in degrees or radians

Sine Calculator

Evaluate sin(θ) for any angle with exact unit circle coordinates and radian conversions

Cosine Calculator

Evaluate cos(θ) for any angle with exact unit circle coordinates and conversions

Tangent Calculator

Evaluate tan(θ) = sin(θ)/cos(θ) with angle slopes and asymptote detection

Degree / Radian Converter

Convert angles bidirectionally between Degrees (°) and Radians (rad) with exact π multiples

Derivative Calculator

Compute polynomial and trigonometric derivatives with power rule and chain rule steps

Integral Calculator

Calculate definite and indefinite integrals with antiderivatives and area under the curve

Limit Calculator

Evaluate mathematical limits lim(x→c) with direct substitution, L’Hôpital’s rule, and one-sided limits

Statistics Calculator

Calculate sample and population variance, standard deviation, mean, and interquartile range

Mean Calculator

Calculate arithmetic mean, sum of observations, and dataset sample count with steps

Median Calculator

Find the exact middle median value of any sorted dataset, resistant to extreme outliers

Standard Deviation Calculator

Calculate sample std dev (s) and population std dev (σ) with step-by-step variance

Variance Calculator

Calculate sample variance s² and population variance σ² from squared deviations

Probability Calculator

Calculate event probabilities, permutations (nPr), combinations (nCr), and odds

Permutation Calculator (nPr)

Calculate permutations nPr where order matters using exact factorial formulas

Combination Calculator (nCr)

Calculate combinations nCr = n! / [r!(n-r)!] where order is irrelevant

Matrix Calculator

Add, multiply, invert, and transpose 2x2 and 3x3 matrices with step-by-step linear algebra

Determinant Calculator

Calculate determinants det(A) for 2x2 and 3x3 matrices using expansion by minors

Vector Calculator

Calculate 3D vector addition, dot product, cross product, magnitude, and angles

GCD Calculator (GCF / HCF)

Find Greatest Common Divisor using step-by-step Euclidean division algorithm

LCM Calculator

Calculate Least Common Multiple using the fundamental formula lcm(a, b) = |a·b| / gcd(a, b)

Prime Number Checker

Check primality up to 100 trillion, find divisors, and view prime factor trees

Prime Factorization Calculator

Decompose any positive integer into canonical prime factors with powers and tree steps

Fibonacci Calculator

Generate Fibonacci numbers Fn = Fn-1 + Fn-2 and compute golden ratio approximations

Sequence & Series Calculator

Calculate arithmetic and geometric sequence n-th terms, partial sums, and series formulas

Coordinate Geometry Calculator

Calculate 2D distance, midpoint, slope m, and line equations between points (x1, y1) and (x2, y2)

Graphing Calculator

Interactive HTML5 Canvas function plotter with Cartesian coordinate grid, zoom, and presets

Number to Words Converter

Convert numbers into formal written English words and check-writing currency formats

Roman Numeral Converter

Convert numbers bidirectionally between standard Arabic numbers (1–3999) and Roman numerals

Binary Converter

Convert base-2 binary strings into decimal, hexadecimal, octal, and ASCII text

Decimal Converter

Convert base-10 decimal numbers into binary, hexadecimal, octal, and BCD

Hex Converter

Translate hexadecimal strings into decimal, binary, octal, and ASCII text

Octal Converter

Convert base-8 octal numbers to decimal, binary, hex, and Unix chmod file permissions

Velocity Calculator (v = d / t)

Calculate velocity, speed, displacement, and time elapsed with multi-unit conversions

Acceleration Calculator (a = Δv / t)

Calculate constant linear acceleration, change in velocity, and g-force equivalents

Distance Kinematics Calculator

Calculate displacement d = v_i·t + ½·a·t² under constant acceleration

Projectile Motion Calculator

Simulate 2D trajectory parabolic paths, maximum height, flight time, and horizontal range

Force Calculator (F = ma)

Calculate net force in Newtons and pounds-force using Newton’s Second Law

Newton’s Second Law Calculator

Calculate net force, friction resistance f_k = μ·N, and net acceleration

Pressure Calculator (P = F / A)

Calculate mechanical pressure in Pascals, bar, PSI, and atmospheres

Density Calculator (ρ = m / V)

Calculate material mass density in kg/m³, g/cm³, and lb/ft³ with material presets

Momentum & Impulse Calculator

Calculate linear momentum p = mv, impulse J = F·Δt, and 1D collision outcomes

Kinetic Energy Calculator (KE = ½mv²)

Calculate translational kinetic energy in Joules, kJ, and kilocalories

Potential Energy Calculator (PE = mgh)

Calculate gravitational potential energy in Joules and kilojoules

Work Calculator (W = F·d·cos θ)

Calculate mechanical work done in Joules accounting for angle of applied force

Power Calculator (P = W / t)

Calculate power rate of energy transfer in Watts, Kilowatts, and Horsepower

Gravity Calculator (Newton’s Law)

Calculate universal gravitational attraction F = G·m₁m₂/r² and planetary surface gravity

Heat Energy Calculator (Q = mcΔT)

Calculate thermal energy transfer Q = m·c·ΔT in Joules, kJ, and kilocalories

Temperature Converter (°C, °F, K, °R)

Convert temperatures across Celsius, Fahrenheit, Kelvin, and Rankine scales

Ohm’s Law Calculator (V = IR)

Calculate Voltage, Current, Resistance, and Power wheel with 4-way solving

Voltage Calculator

Calculate electric potential difference V = I·R and V = P / I in Volts

Current Calculator

Calculate electric current I = V / R and I = P / V in Amperes

Resistance Calculator

Calculate electrical resistance R = V / I and series/parallel resistor networks

Electrical Power Calculator (P = VI)

Calculate electric power in Watts, Kilowatts, and BTU/h using Joule’s Law

Coulomb’s Law Calculator

Calculate electrostatic attraction and repulsion force F = k_e·|q₁q₂|/r²

Wave Speed Calculator (v = f·λ)

Calculate wave speed, frequency, and wavelength across sound, light, and water waves

Frequency Calculator (f = 1 / T)

Calculate oscillation frequency in Hertz, kHz, and MHz from wave period or speed

Wavelength Calculator (λ = v / f)

Calculate spatial wavelength in meters and nanometers from frequency and wave speed

Wave Period Calculator (T = 1 / f)

Calculate wave oscillation period in seconds and milliseconds from frequency

Thin Lens Equation Calculator

Calculate focal length, image distance, and magnification for converging and diverging lenses

Spherical Mirror Calculator

Calculate image distance and magnification for concave and convex mirrors

Physics Formula Calculator & Constants

Calculate Einstein’s E = mc², Planck’s E = hf, pendulum periods, and De Broglie wavelengths

Molar Mass Calculator

Calculate molar mass, molecular weight, and percent composition of chemical formulas

Molecular Weight Calculator

Compute molecular weight in g/mol and Daltons (Da) with atomic mass breakdowns

Mole Calculator (Grams ⇄ Moles ⇄ Particles)

Convert between mass in grams, chemical moles, and number of molecules using Avogadro’s constant

Molarity Calculator (M = mol / L)

Calculate molar concentration, solute moles, and solution volume in Liters

Molality Calculator (m = mol / kg)

Calculate temperature-independent molal concentration in moles per kilogram of solvent

Solution Concentration Calculator (g/L, ppm, %)

Calculate mass concentrations in g/L, mg/mL, parts-per-million (ppm), and weight/volume %

Dilution Calculator (C₁V₁ = C₂V₂)

Calculate stock volume and solvent addition for solution dilutions C₁·V₁ = C₂·V₂

Stoichiometry Calculator

Calculate reaction mole ratios, product yields, and limiting reactant amounts

pH Calculator (pH = -log[H⁺])

Calculate solution pH, pOH, and hydronium [H⁺] ion concentration with interactive acidity scale

pOH Calculator (pOH = -log[OH⁻])

Calculate hydroxide ion concentration [OH⁻], pOH, and corresponding pH

Acid-Base Titration Calculator

Calculate equivalence point volume in volumetric acid-base neutralization titrations

Percent Composition Calculator

Calculate percentage by mass of every element in a chemical compound

Empirical Formula Calculator

Derive simplest whole-number atomic ratio from mass percentages or elemental grams

Molecular Formula Calculator

Calculate actual molecular formula from empirical formula and experimental molar mass

Ideal Gas Law Calculator (PV = nRT)

Calculate Pressure, Volume, Moles, or Temperature with universal gas constant R

Boyle’s Law Calculator (P₁V₁ = P₂V₂)

Calculate isothermal gas pressure-volume relationship at constant temperature

Charles’s Law Calculator (V₁/T₁ = V₂/T₂)

Calculate isobaric gas thermal expansion and contraction at constant pressure

Combined Gas Law Calculator

Calculate gas transitions when Pressure, Volume, and Temperature change simultaneously

Radioactive Half-Life Calculator

Calculate exponential radioactive decay, remaining isotope mass, and elapsed half-lives

Electron Configuration Tool

Generate Aufbau orbital electron configurations and noble gas shorthand for elements 1 to 118

Oxidation Number Calculator

Determine oxidation states of transition metals and elements in chemical compounds and polyatomic ions

Chemical Equation Balancer

Balance chemical reactions and verify atomic conservation of mass automatically

Punnett Square Generator (Monohybrid & Dihybrid)

Generate 2×2 and 4×4 Punnett squares with genotypic and phenotypic inheritance ratios

Genetics Probability Calculator

Calculate multi-locus independent assortment probabilities using Mendelian product and sum rules

DNA Complement Calculator

Generate 5' to 3' Watson-Crick complementary DNA strands with base count statistics

DNA Reverse Complement Calculator

Generate 5' to 3' reverse complement sequences essential for PCR primer design and Sanger sequencing

DNA to RNA Transcription Converter

Transcribe DNA sequences to mRNA (T ⟶ U) or reverse-transcribe RNA to cDNA

Genetic Codon Translator (DNA/RNA ⟶ Protein)

Translate nucleotide sequences into 20 amino acid polypeptide chains using the universal genetic code

Hardy-Weinberg Equilibrium Calculator

Calculate allele frequencies (p, q) and genotype frequencies (p², 2pq, q²) in population genetics

Population Growth Calculator (Exponential & Logistic)

Simulate exponential unconstrained growth and logistic carrying capacity S-curve populations

Clinical BMI Calculator (WHO Standards)

Calculate Body Mass Index and healthy weight ranges according to WHO clinical criteria

Basal Metabolic Rate & TDEE Calculator

Calculate daily resting calories (BMR) and total daily energy expenditure (TDEE) using Mifflin-St Jeor

Biological Age Calculator

Estimate biological vs chronological age based on physiological biomarkers and lifestyle metrics

Microscope Magnification Calculator

Calculate total optical magnification M_total = M_ocular × M_objective for light microscopy

Field of View & Cell Sizing Calculator

Estimate individual cellular diameter in micrometers (μm) from field of view (FOV)

Mean Calculator (Arithmetic, Weighted & Trimmed)

Calculate sample mean, population mean, and central tendency measures of numerical datasets

Median Calculator

Find the middle value and robust 50th percentile of sorted datasets

Mode Calculator

Identify most frequent values, unimodal, bimodal, and multimodal distribution peaks

Range Calculator

Calculate total statistical dispersion and difference between maximum and minimum values

Variance Calculator (Sample & Population)

Calculate sample variance s² (with Bessel’s correction n-1) and population variance σ²

Standard Deviation Calculator (s & σ)

Compute sample standard deviation s and population standard deviation σ with deviation steps

Z-Score Calculator (Standard Normal Score)

Standardize values into Z-scores and find exact percentile positions on the normal distribution

Percentile Calculator

Calculate k-th percentiles and percentile rankings using empirical cumulative distribution functions

Quartile Calculator (Q₁, Q₂, Q₃)

Calculate First Quartile (Q₁), Median (Q₂), and Third Quartile (Q₃) for 5-number summaries

IQR Calculator (Interquartile Range & Outliers)

Calculate Interquartile Range (Q₃ - Q₁) and detect outliers using Tukey’s 1.5×IQR fences

Pearson Correlation Coefficient Calculator (r)

Calculate Pearson product-moment correlation coefficient r and determine relationship strength

Covariance Calculator (Sample & Population)

Calculate joint variability Cov(X, Y) between two random variables

Regression Calculator

Perform linear regression analysis with slope, intercept, and predictive evaluations

Linear Regression Calculator (ŷ = mx + b)

Calculate slope m, y-intercept b, line equation, and predict future y values

R-Squared Calculator (Coefficient of Determination)

Calculate R² to quantify the percentage of variance explained by the regression model

Probability Calculator (AND / OR Rules)

Calculate joint probability P(A ∩ B), union P(A ∪ B), and conditional probabilities

Normal Distribution Calculator (Gaussian Bell Curve)

Calculate cumulative normal distribution CDF P(X ≤ x) and standard normal probabilities

Binomial Distribution Calculator (B(n, p))

Calculate exact and cumulative binomial probabilities for n independent Bernoulli trials

Poisson Distribution Calculator

Model rare discrete events occurring independently at constant average rate λ

P-Value Calculator (Hypothesis Significance)

Calculate two-tailed and one-tailed p-values from Z, T, and Chi-Square test statistics

Student’s T-Test Calculator (One-Sample & Two-Sample)

Perform one-sample and two-sample Student's t-tests for small sample hypothesis testing

Z-Test Calculator

Perform hypothesis Z-tests for large sample sizes with known population standard deviation

Chi-Square Test Calculator (χ² Goodness of Fit)

Perform Pearson’s Chi-Square test of independence and goodness-of-fit for categorical distributions

One-Way ANOVA Calculator (F-Test)

Perform Analysis of Variance (ANOVA) to compare means across three or more treatment groups

Confidence Interval Calculator

Calculate 90%, 95%, and 99% confidence intervals for population means with margin of error

Margin of Error Calculator

Calculate sampling margin of error for surveys and opinion polls

Sample Size Calculator (Cochran’s Formula)

Determine minimum required sample size for research surveys and clinical studies

Binary Converter (Base 2 ⇄ Dec, Hex, Oct)

Convert binary sequences into decimal, hexadecimal, and octal with bit-weight expansions

Decimal Converter (Base 10 ⇄ Binary, Hex, Oct)

Convert decimal integers to binary, hexadecimal, and octal using repeated division

Hexadecimal Converter (Base 16 ⇄ Bin, Dec, Oct)

Convert hexadecimal strings (0-9, A-F) to binary, decimal, and octal formats

Octal Converter (Base 8 ⇄ Bin, Dec, Hex)

Convert octal numbers (0-7) to binary, decimal, and hexadecimal with 3-bit triplets

Arbitrary Base N Converter (Base 2 to 36)

Convert numbers between any arbitrary radices from Base 2 up to Base 36

Binary Calculator (Add, Subtract, Multiply, Divide)

Perform arithmetic on binary numbers with two's complement signed representations

Boolean Algebra Calculator & Laws

Simplify boolean expressions and explore De Morgan’s laws, absorption, and identity theorems

Truth Table Generator

Generate complete truth tables for AND, OR, XOR, NAND, NOR, and XNOR boolean functions

Interactive Logic Gate Simulator

Simulate digital logic gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) with interactive toggle pins

Bitwise Calculator (AND, OR, XOR, Shifts)

Perform bitwise operations (&, |, ^, ~, <<, >>) with interactive 8-bit binary visualizations

Text to ASCII Converter (Dec, Hex, Binary)

Convert text characters into ASCII decimal, hexadecimal, and binary byte sequences

Searchable ASCII Table (0 to 127)

Complete 0–127 ASCII reference chart with Decimal, Hex, Octal, Binary, and Control Codes

Unicode Converter (Code Points & UTF-8 Bytes)

Convert characters and emojis to Unicode code points (U+XXXX), UTF-8 bytes, and HTML entities

Big-O Complexity Calculator & Scaling Visualizer

Calculate and project operation counts for O(1), O(log n), O(n), O(n log n), O(n²), and O(2ⁿ)

Algorithm & Data Structure Complexity Reference

Interactive complexity matrix for sorting algorithms, search methods, and core data structures

IPv4 Subnet Calculator (CIDR & Masks)

Calculate network address, broadcast address, netmask, and usable host ranges from CIDR

Data Storage Converter (KB, MB, GB vs KiB, MiB, GiB)

Convert between decimal metric storage (10³) and binary operating system units (2¹⁰)

Ohm’s Law & DC Power Calculator

Calculate Voltage (V), Current (I), Resistance (R), and Power (P) across DC circuits

Resistor Calculator (Series, Parallel & Color Codes)

Calculate Series and Parallel equivalent resistance with 4-band color code interpretations

Capacitor Calculator (Energy & RC Time Constant)

Calculate stored charge Q = C·V, electrostatic energy E = ½CV², and RC time constant τ

Inductor Calculator (Energy & RL Time Constant)

Calculate stored magnetic energy E = ½LI² and RL transient time constant τ = L / R

Power Factor & AC Power Triangle Calculator

Calculate Real Power (kW), Reactive Power (kVAR), Apparent Power (kVA), and PF correction

Electrical Load & Ampacity Calculator (1Φ & 3Φ)

Calculate full load operating current and circuit breaker sizes for Single-Phase and Three-Phase systems

Gear Ratio & Speed Reducer Calculator

Calculate gear ratio, output RPM reduction, and multiplied output torque with mechanical efficiency

Torque & Rotational Horsepower Calculator

Calculate mechanical torque τ = F·r and rotational power in Watts and Imperial Horsepower (HP)

Stress & Factor of Safety Calculator

Calculate normal tensile/compressive stress σ = F/A and design safety factors (SF)

Strain & Hooke’s Law Calculator

Calculate engineering strain ε = ΔL/L₀ and elastic stress from Young’s Modulus (E)

Euler-Bernoulli Beam Deflection Calculator

Calculate maximum beam deflection δ_max and bending moment M_max under point and uniform loads

Pipe Flow & Volumetric Discharge Calculator

Calculate volumetric discharge Q = A·v, velocity, and Darcy-Weisbach friction head loss

Reynolds Number & Flow Regime Calculator

Calculate dimensionless Reynolds number Re and classify Laminar, Transitional, or Turbulent flow

Engineering Unit Converter (Pressure, Force, Power)

Convert between SI and US Customary units for Pressure, Stress, Force, Torque, and Power

College & High School GPA Calculator

Calculate semester Grade Point Average on standard 4.0, weighted, and unweighted scales

Cumulative CGPA Calculator

Calculate cumulative overall CGPA across multiple college semesters

Semester GPA Calculator (SGPA)

Calculate term SGPA with dynamic course entries and credit weighting

Degree Credits & Graduation Progress Calculator

Track completed credit hours, graduation requirements, and degree completion percentage

GPA ↔ Percentage Converter (US, India & UK)

Convert between US 4.0 GPA, India 10.0 CGPA (9.5× rule), and academic percentages

Course Grade Calculator

Calculate overall course percentage and letter grades across all syllabus categories

Final Grade Calculator

Determine the exact final exam score needed to get your desired class grade

Required Exam Score Calculator

Calculate target test marks needed to pass or achieve high honors

Weighted Grade Calculator

Calculate weighted average grades with customized syllabus percentage weights

Course Grade & Syllabus Simulator

Simulate potential course outcomes based on anticipated assignment scores

Marks Percentage Calculator (Board & School Exams)

Calculate overall percentage and division across multiple school and board exam subjects

Student Percentage Math Calculator

Quick percentage math solver for test marks, score increases, and ratios

College Attendance Percentage Calculator

Calculate current attendance percentage = (Attended / Total) × 100%

Required Attendance & Bunk / Skip Calculator

Calculate how many classes you MUST attend to hit 75%/85%, or how many you can safely bunk

Study Time & Credit Hours Recommendation Calculator

Calculate weekly study hours based on the Carnegie credit-hour rule and course difficulty

Exam Countdown & Revision Timer

Live days countdown to final exams, midterms, and SAT/ACT test dates

Assignment & Project Timeline Calculator

Break term papers and assignments into manageable daily work milestones

Study Session Stopwatch & Focus Timer

Track dedicated study hours, focus intervals, and session time milestones

Pomodoro Focus Timer (25m / 5m / 15m)

Classic 25-minute Pomodoro focus cycles with automated short and long breaks

Exam Date Countdown & Revision Window

Live days, weeks, and hours countdown to midterms and final examinations

Active Recall Flashcard Generator

Interactive 3D flip flashcards for active recall testing with custom and pre-loaded STEM decks

Interactive Quiz Generator

Interactive practice quiz maker with instant scoring, feedback, and active recall testing

Speed Mental Math Quiz Generator

Speed mental arithmetic drills (Addition, Subtraction, Multiplication) with difficulty tiers

Random Question & Oral Exam Prompt Generator

Randomized conceptual prompts for viva examinations, mock interviews, and self-testing

Printable Practice Worksheet Generator

Generate clean, printable STEM and math practice worksheets with custom problem counts

Worksheet Answer Key & Solution Generator

Instant step-by-step solutions and answer keys corresponding to generated practice sheets

Random Practice Problem Generator

Infinite randomized practice problems across Algebra, Arithmetic, and Physics

Multiplication Table & Grid Generator (Up to 20×20)

Interactive and printable multiplication grid tables from 1×1 up to 20×20 or single table views

Weekly Study Schedule & Timetable Generator

Generate balanced weekly study timetables distributing subjects across morning, afternoon, and evening

Daily Study Planner & Task Checklist

Track daily study priorities, focus hour quotas, and syllabus completion tasks

Spaced Repetition Revision Planner (1-3-7-21 Days)

Ebbinghaus forgetting curve revision schedule at 1, 3, 7, and 21-day spaced intervals

Printable STEM Formula Sheet & Cheat-Sheet Builder

Compile and print customized formula cheat-sheets for Math, Physics, Chemistry, and Engineering

2D Cartesian Graphing Calculator

Interactive 2D Cartesian graphing calculator with zoom, pan, multiple functions, and value tables

Function Curve Visualizer

Plot single and dual function curves to visualize intersections, roots, and behavior

Algebraic Equation Grapher

Graph linear, quadratic, and polynomial equations on the Cartesian plane

2D Inequality Region Shader

Shade 2D inequality solution regions (y ≥ f(x), y ≤ f(x), y > f(x), y < f(x))

Universal 2D Vector Graph Generator

Generate clean, publication-ready 2D Cartesian function and relation graphs

Interactive Coordinate Plane & Distance/Midpoint Explorer

Plot coordinate points (x, y), calculate Euclidean distance, midpoint, slope, and line equations

Interactive Number Line Inequality Visualizer

Graph open and closed rays and interval inequalities (x > a, x ≤ b, a ≤ x < b) on the real number line

Statistical Data Graph Generator

Transform raw numerical datasets into clean distributions, scatter plots, and histograms

Scatter Plot & Linear Regression Generator

Plot bivariate (x, y) points with automatic least-squares regression line (y = mx + b) and Pearson r

Continuous Frequency Distribution Histogram Generator

Group continuous datasets into custom bins and render frequency distribution histograms

Interactive Pie & Donut Chart Generator

Create interactive SVG pie and donut charts with custom categories, percentages, and legends

Comparative Bar Chart Generator

Create comparative horizontal and vertical bar charts with custom labels and values

Time-Series & Trend Line Chart Generator

Create continuous trend line charts for time-series and sequential data tracking

Compound Interest & Wealth Growth Calculator

Calculate compound interest growth A = P(1 + r/n)^(nt) with recurring monthly contributions

Simple Interest Calculator (I = P·r·t)

Calculate non-compounding interest on fixed loans, treasury bills, and promissory notes

Time Value of Money (TVM) Solver

Solve for Present Value (PV) or Future Value (FV) given discount rate and time periods

Annuity Present & Future Value Calculator

Value Ordinary Annuities and Annuities Due across recurring payment series

Return on Investment (ROI) & Annualized Rate Calculator

Calculate net profit, total percentage ROI, and annualized rate of return per year

Compound Annual Growth Rate (CAGR) Calculator

Calculate the smooth annual growth rate across multi-year business and investment periods

Inflation & Purchasing Power Erosion Calculator

Calculate future price of goods and the decline of purchasing power over time

Break-Even Analysis & Margin of Safety Calculator

Calculate unit sales and revenue needed to cover fixed and variable business costs

Profit Margin & Markup Calculator

Calculate gross profit margin percentage, net profit, and markup on cost

Price Elasticity of Demand (PED) Calculator

Calculate arc midpoint price elasticity of demand and classify Elastic, Inelastic, or Unitary

Opportunity Cost & Trade-off Analyzer

Quantify the economic value and return of the next best forgone alternative

Loan EMI & Amortization Schedule Calculator

Calculate fixed monthly EMI payments, total interest cost, and annual balance paydown

Scientific Length, Distance & Astronomical Units Converter

Subatomic to astronomical metric, imperial, and cosmological distance conversions with scientific notation

Scientific Mass, Weight & Atomic Units Converter

Micrograms, Daltons/amu, carats, slugs, kilograms, pounds, and metric tons with exact molar mass linkage

Velocity, Speed & Mach Number Converter

Kinematic velocities, aerodynamic Mach numbers at standard sea level, knots, and relativistic fractions of c

Acceleration & Gravitational G-Force Converter

Kinematic accelerations, planetary g-forces, Gal seismology units, and aerospace load factors

Scientific Area & Geodetic Surface Converter

Nuclear cross-section barns, circular mils, square meters, hectares, acres, and square kilometers

Scientific Force & Gravitational Load Converter

Newtons, dynes, pound-force (lbf), kilogram-force (kgf), kips, and poundals with Newton's second law derivations

Torque & Moment of Force Engineering Converter

Newton-meters, foot-pounds, inch-pounds, dyne-centimeters, and kilogram-force meters for mechanical powertrains

Scientific Volume & Fluid Capacity Converter

Microliters, cubic meters, liters, US/UK gallons, oil barrels, and laboratory glassware volumetric units

Volumetric Flow Rate & Discharge Converter

Cubic meters per second, L/min, CFM (cubic feet per minute), US/UK GPM, and petroleum barrels per day

Pressure, Stress & Vacuum Engineering Converter

Pascals, bar, psi, MPa, atmospheres, Torr/mmHg, inches of mercury, and deep-vacuum millitorr

Scientific Density & Specific Gravity Converter

kg/m³, g/cm³, lb/ft³, lb/gal, water relative specific gravity, and petroleum API gravity with temperature compensation

Dynamic & Kinematic Viscosity Converter

Pascal-seconds, Poise, Centipoise (cP), Stokes, Centistokes (cSt), and Saybolt Universal Seconds (SSU)

Thermodynamic Temperature Scale Converter

Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, and Réaumur with absolute zero calibration

Scientific Energy, Work & Heat Converter

Joules, calories, kilocalories, BTU, therms, electron-volts (eV), kilowatt-hours (kWh), and foot-pounds

Scientific Power & Heat Flow Rate Converter

Watts, kilowatts, metric horsepower (PS/CV), mechanical horsepower (HP), BTU/hr, and tons of refrigeration (TR)

Thermal Conductivity & Heat Transfer Coefficient Converter

W/(m·K), cal/(s·cm·°C), BTU/(hr·ft·°F), and building insulation U-values & R-values

Electric Charge, Current & Potential Converter

Coulombs, Ampere-hours, elementary charges (e), Amperes, Volts, and electrostatic statcoulombs/statvolts

Magnetic Field & Flux Density Converter

Tesla (T), Gauss (G), Weber (Wb), Maxwell (Mx), gamma (γ), Oersted (Oe), and Ampere-turns per meter

Frequency, Wavelength & Photon Energy Converter

Hertz (Hz to THz), electromagnetic wavelength (meters, nm, Å), photon energy (eV, J), and wavenumber (cm⁻¹)

Radiation Activity & Absorbed Dose Converter

Becquerel (Bq), Curie (Ci), Gray (Gy), Rad, Sievert (Sv), Rem, and ionizing exposure Roentgen (R)

Advanced Scientific Calculator

Multi-function algebraic, trigonometric, logarithmic, and combinatorics scientific workstation

Significant Figures Calculator & Counter

Count sig figs, classify digit types, and perform addition, subtraction, multiplication & division rounding rules

Scientific Notation & E-Notation Calculator

Perform arithmetic on scientific (a × 10^b) and engineering E-notation numbers with SI metric prefixes

Measurement Uncertainty & Error Propagation Calculator

Calculate propagated absolute and relative uncertainties for experimental measurements

Percent Error & Percent Difference Analyzer

Calculate experimental percent error and duplicate trial percent difference with graphical tolerance bands

CODATA Fundamental Physical Constants Explorer

Searchable NIST CODATA 2022 physical constants database with uncertainty bounds and 1-click clipboard copy

Interactive Periodic Table of Elements

Dynamic 118-element periodic grid with IUPAC blocks, electron configurations, and element inspector

Isotope Abundance & Relative Atomic Mass Calculator

Calculate weighted average atomic mass from natural isotope percentages with mass defect estimates

Radiocarbon Dating & Archaeological Age Calculator

Calculate archaeological Carbon-14 age, remaining %pMC, and calendar historical era alignment

Beer-Lambert Law & Spectrophotometry Calculator

Calculate absorbance, transmittance, molar absorptivity, and concentration with interactive calibration curve

Henderson-Hasselbalch Buffer Solution Calculator

Calculate buffer pH, conjugate acid/base molar ratio, and buffer capacity (β) against added strong acid/base

Serial Dilution & Plating Factor Calculator

Calculate multi-tube sequential logarithmic dilutions, cumulative factors, and CFU/mL microbial plating density

Standard Solution Reagent Preparation & Purity Calculator

Calculate exact reagent mass to weigh on analytical balances with chemical assay purity and hydrate corrections

Arrhenius Equation & Reaction Kinetics Calculator

Calculate activation energy (Ea), rate constants, and temperature dependence with interactive Arrhenius plot

Nernst Equation & Electrochemical Cell Potential Calculator

Calculate non-standard cell potential (Ecell), reaction quotient (Q), Gibbs free energy (ΔG), and cell spontaneity

Universal Printable Math Worksheet Maker

Create custom printable math worksheets with student headers, problem counts, and matching answer keys

Speed Arithmetic Facts & Timed Math Drill Generator

Generate timed sprint arithmetic fact sheets (20 to 100 problems) for addition, subtraction, multiplication & division

Fractions & Mixed Numbers Practice Worksheet Maker

Generate fraction addition, subtraction, multiplication, division, and mixed numbers practice sheets

Multiplication Times Tables & Mystery Grid Maker

Create printable multiplication tables, mystery missing-number grids (10×10 to 20×20), and single-table drills

Real-World Elementary Math Word Problem Generator

Generate real-world word problems covering money, change, time, distance, and sharing with scratchpad boxes

Algebraic Equations & Factoring Worksheet Generator

Generate linear equations, variables on both sides, systems of equations, and quadratic factoring worksheets

Geometric Shapes, Area, Volume & Angles Worksheet Maker

Generate perimeter, area, surface area, volume, and angle geometry worksheets with dynamic SVG figures

Cartesian Coordinate Plane Grid Worksheet Maker

Create printable coordinate grid worksheets (1, 2, 4, or 6 grids per page) with plotting drills and line graphing

Ratios, Proportions & Percentages Worksheet Maker

Generate worksheets for ratios, proportions, unit rates, discounts, sales tax, and percent change

PEMDAS / BODMAS Order of Operations Drill Maker

Generate PEMDAS/BODMAS worksheets with parentheses, brackets, exponents, and stepped evaluation trees

Trigonometric Functions & Right Triangle Worksheet Maker

Generate right triangle SOH-CAH-TOA, unit circle exact values, and Law of Sines/Cosines worksheets

Calculus Derivatives & Integrals Practice Worksheet Generator

Generate polynomial limits, power/product/chain rule derivatives, and basic integral worksheets

Sig Figs & Scientific Notation Practice Worksheet Maker

Generate sig fig counting, arithmetic rounding, scientific notation, and metric conversion worksheets

Chemical Equations & Stoichiometry Worksheet Maker

Generate chemical equation balancing, molar mass, and stoichiometry mole ratio drill sheets

Physics Kinematics & Forces Practice Worksheet Maker

Generate kinematics, Newton's laws (F=ma), work/energy, and Ohm's law physics problem worksheets

App Icon Shape Converter

Convert rounded icons to Google Play 512×512 sharp squares, Apple squircles, or circle crops

Image Padding & Canvas Extender

Add uniform or custom margins around images and logos without scaling or quality loss

AI Vocal Remover & Karaoke Instrumental Maker

Separate vocals and instruments from any song 100% locally in your browser

GIF Frame Extractor & Splitter (PNG ZIP)

Split animated GIFs into individual high-resolution PNG frames and download as ZIP

Reverse GIF Maker & Boomerang Loop Studio

Play animated GIFs backwards or create viral Boomerang loops 100% in-browser

Video Volume Booster (100% to 400% Louder)

Amplify quiet video sound up to 400% with hardware compressor limiter in-browser

Text to Realistic Handwriting Assignment Simulator

Convert typed essays and homework into authentic handwritten ruled notebook pages

AI Image to SVG Vectorizer (Lossless Bitmap Tracer)

Convert PNG, JPG, and logos into clean scalable SVG vector graphics locally in-browser

Lossless EXIF Metadata Scrubber & GPS Location Stripper

Sanitize camera metadata, GPS geo-tags, and serial numbers with zero loss in visual quality

Image Steganography Studio (Hide Secret Text in Photos)

Conceal and extract encrypted secret messages within image pixels using LSB encoding

World Time Meeting Planner & Timezone Overlap Matrix

Schedule international meetings across global timezones with a visual 24-hour availability matrix

International IBAN & BIC/SWIFT Validator

Verify bank account numbers, check digits, and BBAN structures across 80+ countries

Final Grade & Exam Target Score Calculator

Find out exactly what score you need on your final exam to secure an A, B, or C

Reverse Audio Studio (Play Backwards & Export MP3)

Play songs backwards, uncover backmasking effects, and export reversed MP3 / WAV audio

Video Flip & Mirror Studio (Horizontal / Vertical)

Flip horizontal, mirror selfie camera, flip vertical, and rotate videos without watermarks

PDF Booklet & Magazine Imposition Creator

Impose PDF pages 2-up per sheet in exact saddle-stitch folding order for duplex printing

Academic Citation & Bibliography Studio

Generate accurate APA 7, MLA 9, Chicago, Harvard, and BibTeX citations with in-text quotes

Private Ovulation & Fertility Calendar Studio

Calculate your fertile window, peak ovulation day, and estimated conception due date 100% privately

International Footwear & Ring Size Studio

Convert US, UK, EU, Japan, and Korea shoe sizes plus interactive on-screen physical ring sizer

Japanese Zenkaku ⇄ Hankaku Converter (全角半角変換)

Convert between Full-width and Half-width Katakana, Alphanumeric, and Spaces for official Japanese forms

Crypto DCA & Portfolio Accumulation Studio

Simulate recurring Bitcoin, Ethereum, and crypto investments with compounding growth curves and lump-sum comparison

Comprehensive Zakat & Wealth Purification Studio

Calculate your annual Zakat obligation on cash, gold, silver, investments, and business goods with live Nisab benchmarks

Blood Alcohol Content (BAC) & Sobriety Estimator

Estimate your current BAC percentage, legal driving status, and hours until completely sober using the Widmark formula

Dog & Cat Age to Human Years Scientific Studio

Calculate the true biological human age of your dog or cat using modern veterinary epigenetic models

Indian PPF & Gratuity Calculation Studio

Calculate Public Provident Fund (PPF) 15-year tax-free wealth compounding and statutory employee gratuity payouts

UK Stamp Duty Land Tax (SDLT) Studio

Calculate exact Stamp Duty tax on residential property purchases across England and Northern Ireland

Intermittent Fasting & Autophagy Metabolic Studio

Track 16:8, 18:6, OMAD, and extended fasts with cellular autophagy and ketosis timelines

Calculadora de Finiquito y Liquidación Laboral

Calcula tu indemnización, aguinaldo, vacaciones dignas y prima de antigüedad con la Ley Federal del Trabajo

Flight Distance & Flight Time Studio

Calculate great-circle flight distance, estimated flight time, and CO2 emissions between 120+ global airports

eGFR & Kidney Function Clinical Studio

Calculate estimated Glomerular Filtration Rate using race-free 2021 CKD-EPI and Cockcroft-Gault formulas

PGP & Asymmetric Encryption Studio

Generate RSA-2048/4096 keypairs, encrypt and decrypt secret messages 100% in-browser via Web Crypto

Brutto-Netto-Rechner (Gehaltsrechner Deutschland)

Berechne exakt dein monatliches und jährliches Nettogehalt nach Steuerklassen 1–6 und Sozialabgaben

Calculadora de Rescisão de Contrato CLT (Brasil)

Calcule seus direitos trabalhistas, aviso prévio proporcional, férias + 1/3 e multa de 40% do FGTS

Interactive Periodic Table & Molar Mass Studio

Explore all 118 chemical elements with real-time temperature state changes and molecular mass calculator

Australian Tax & Superannuation Studio

Calculate your exact take-home pay with Stage 3 tax cuts, 2% Medicare levy, and Superannuation Guarantee

App Icon & Asset Generator (iOS & Android)

Upload a 1024x1024 icon and generate all Xcode and Android mipmap resolutions into a ready-to-deploy ZIP

Cap Rate & Rental Cash Flow Studio

Analyze commercial and residential rental property returns: Cap Rate, Cash-on-Cash ROI, NOI, and 10-year cash flow

Calcolo del Codice Fiscale & Decoder Inverso

Calcola il Codice Fiscale ufficiale a 16 caratteri per cittadini italiani ed esteri con decodifica inversa

Calculateur de Salaire Brut en Net (France)

Convertissez instantanément votre salaire brut en net mensuel et annuel pour Cadre, Non-Cadre et Fonctionnaire

Canada Paycheck & Provincial Tax Studio

Calculate your net take-home pay per paycheck across Ontario, BC, Alberta, and Quebec with CPP and EI

Calculadora de Sueldo Neto e IRPF (España)

Calcula con exactitud tu sueldo neto mensual en 12 o 14 pagas, retenciones de IRPF y Seguridad Social

Sound Decibel (dB) & SPL Attenuation Studio

Calculate sound drop over distance via inverse-square law, sum multiple decibel sources, and audit hearing safety

UAE & Saudi End of Service Gratuity Calculator (مكافأة نهاية الخدمة)

Official UAE Labour Law (Decree-Law 33/2021) & Saudi Labor Code End of Service Gratuity (EOSG) calculator

Philippine 13th Month Pay & BIR Tax Calculator

Official DOLE PD 851 13th month pay calculator with TRAIN Law ₱90,000 tax-exempt cap and SSS/PhilHealth/Pag-IBIG deductions

Dutch Salary Calculator & 30% Ruling (Bruto Netto Nederland)

Official Netherlands gross-to-net salary calculator with 30% ruling expat tax exemption and 8% Vakantiegeld

Swiss Salary Calculator & Tax Deductions (Lohnrechner Schweiz)

Official Switzerland gross-to-net salary calculator with AHV/IV/EO, ALV, BVG pension, and Cantonal Quellensteuer

BPM to Milliseconds & Reverb Time Calculator

Synchronize delay times, reverb decay & pre-delay, and LFO Hz to song tempo with tap tempo and beat preview

Japan Net Salary & Shakai Hoken Calculator (手取り計算機)

Official Japan take-home pay (手取り) calculator with Health Insurance, Welfare Pension, Resident Tax and Income Tax

Singapore CPF & Take-Home Salary Calculator

Official Singapore CPF employee/employer contribution rates, OA/SA/MA allocation, and IRAS tax calculator

Calculadora de Sueldo Neto México (ISR, IMSS y Aguinaldo)

Calcula tu sueldo neto quincenal y mensual en México con retenciones del SAT (ISR 2024/2025), IMSS y aguinaldo

South Korea Net Salary & 4 Major Insurances (실수령액 계산기)

Official South Korea take-home pay (실수령액) calculator with 4 Major Insurances (4대보험) and non-taxable meals

New Zealand PAYE & KiwiSaver Salary Calculator

Official New Zealand IRD PAYE tax brackets, ACC Earner's Levy (1.60%), KiwiSaver and student loan calculator

Ireland PAYE, USC & PRSI Salary Calculator

Official Ireland net salary calculator with progressive PAYE (20% & 40%), USC rates, PRSI Class A, and Tax Credits

Kalkulator Wynagrodzeń Brutto-Netto (Polska)

Oficjalny kalkulator wynagrodzeń brutto-netto w Polsce ze składkami ZUS (13.71%), NFZ (9%) i ulgą dla młodych

Solar PV System Sizing & Battery Storage Calculator

Calculate solar array capacity (kWp), required roof area, lithium battery storage (kWh & Ah), and carbon offset

Screen PPI, DPI & Retina Viewing Distance Calculator

Calculate pixel density (PPI), dot pitch (mm), Apple Retina distance threshold, and visual acuity (PPD)

Electric Vehicle (EV) Charging Time & Cost Calculator

Calculate charging duration, added driving range, electricity cost, and fuel savings vs gasoline

Lønnskalkulator Norge (Brutto til Netto Lønn)

Offisiell lønnskalkulator for Norge 2024 / 2025: beregn nettolønn, trygdeavgift (7,8%), trinnskatt og fellesskatt

Lönekalkylator Sverige (Räkna ut Lön efter Skatt)

Officiell svensk lönekalkylator 2024 / 2025: kommunalskatt, statlig inkomstskatt (20%), grundavdrag och jobbskatteavdrag

Lønberegner Danmark (Beregn Løn efter Skat)

Dansk nettolønberegner for 2024 / 2025: AM-bidrag (8%), bundskat, kommuneskat, topskat og personfradrag

Brutto-Netto-Rechner Österreich (13. & 14. Gehalt)

Österreichischer Gehaltsrechner 2024 / 2025: Sozialversicherung (18,12%), Lohnsteuertarif und Sonderzahlungen (Urlaubs- & Weihnachtsgeld)

Calculadora de Salario Neto Colombia (Nómina y Prestaciones)

Calculadora laboral oficial de Colombia 2024 / 2025: Salud (4%), Pensión (4%), Auxilio de Transporte y Retención en la Fuente UVT

Calculadora de Sueldo Líquido Chile (Liquidación de Sueldo)

Calcula tu sueldo líquido en Chile 2024 / 2025: AFP por administradora, Salud (Fonasa/Isapre 7%), AFC y escala de Impuesto Único UTM

South Africa Salary & SARS PAYE Tax Calculator

Official South African net salary calculator 2024 / 2025: SARS PAYE brackets (18% to 45%), age rebates, Section 11F pension deductions, Medical Aid credits, and UIF cap

Türkiye Maaş Hesaplama (Brütten Nete 2024 / 2025)

Resmi Türkiye maaş hesaplama 2024 / 2025: SGK işçi primi (%14), işsizlik (%1), kümülatif gelir vergisi dilimleri ve Asgari Ücret Vergi İstisnası (7349)

Kalkulator Gaji Bersih Indonesia (PPh 21 TER 2024 / 2025)

Kalkulator gaji bersih karyawan Indonesia 2024 / 2025: skema PPh 21 TER (A, B, C), iuran BPJS TK (3%), BPJS Kesehatan (1%), dan bonus THR

Calculateur Salaire Brut-Net Belgique (Bruto-Netto Rechner)

Calculateur officiel de salaire net en Belgique 2024 / 2025: ONSS (13,07%), précompte professionnel (25% à 50%), quotité exemptée et 13e mois

Calculadora de Salário Líquido Portugal (IRS e Segurança Social)

Calculadora de salário líquido em Portugal 2024 / 2025: novas tabelas de retenção na fonte de IRS, Segurança Social (11%) e subsídio de refeição

Calculadora de Sueldo Neto Argentina (Recibo de Sueldo y Ganancias)

Calculadora de sueldo de bolsillo en Argentina 2024 / 2025: aportes de ley (17%), nuevo Impuesto a las Ganancias 4ta categoría y Aguinaldo (SAC)

Malaysia Salary & PCB Tax Calculator (Kalkulator Gaji Bersih)

Official Malaysia net pay calculator 2024 / 2025: EPF/KWSP (11%), SOCSO/PERKESO, EIS/SIP with new RM 6k ceiling, and LHDN PCB tax

CBM & Freight Volumetric Weight Calculator (Air & Ocean)

Calculate cubic meters (CBM), cubic feet (CFT), dimensional air freight weight (1:6000 & 1:5000), ocean LCL revenue tons, and container fill percentage

Amazon FBA Fee & E-commerce Profit Margin Calculator

Calculate Amazon FBA referral fees, pick & pack fulfillment fees, monthly storage, PPC advertising cost, break-even price, and net profit margin

Standard Deviation, Variance & Z-Score Calculator

Calculate sample and population standard deviation (s / σ), variance (s² / σ²), standard error of the mean (SEM), and normal distribution Z-scores

MAC Address Lookup & OUI Vendor Inspector

Identify NIC hardware manufacturers from IEEE OUIs, format MAC addresses across Unix/Windows/Cisco, and generate IPv6 modified EUI-64 link-local addresses

Taiwan Salary & Tax Calculator (台灣薪資所得稅計算機)

Calculate Taiwan net salary, labor insurance (勞保 2.2%), national health insurance (健保 2.11%), voluntary pension (0-6%), and 5-tier progressive individual income tax

Hong Kong Salary Tax & MPF Calculator (香港薪俸稅及強積金計算機)

Calculate HK net take-home salary, mandatory MPF (5% capped at HK$1,500/mo), Inland Revenue Department progressive tax vs 15% standard rate, and budget tax relief

Tính Lương Gross Sang Net Chuẩn 2025 (Vietnam Salary Calculator)

Công cụ tính lương Gross sang Net chuẩn quy định BHXH (8%), BHYT (1.5%), BHTN (1%), giảm trừ gia cảnh và 7 bậc thuế TNCN mới nhất theo Nghị định 73/2024

Thailand Salary & PIT Calculator (คำนวณเงินเดือนสุทธิและภาษี)

Calculate Thailand net take-home salary, Social Security Fund (SSF 5% max 750 THB), Provident Fund (PVD), and 8 Revenue Department progressive PIT tax tiers

Pakistan Salary Tax Calculator (FBR Finance Act 2024-2025)

Calculate monthly take-home salary, FBR income tax slabs for salaried individuals, EOBI contributions, and 10% super-rich surcharge under Finance Act 2024

Nigeria PAYE & Salary Tax Calculator (Lagos & All 36 States)

Calculate Nigeria net salary, 8% statutory pension, Consolidated Relief Allowance (CRA), National Housing Fund (NHF), and Sixth Schedule graduated PAYE tax bands

Palkkalaskuri Suomi (Finland Net Salary & Tax Calculator)

Laske käteen jäävä nettopalkka Suomessa: TyEL-eläkemaksu (7.15%), työttömyysvakuutus (0.79%), kunnallisvero, ja valtion tuloveroasteikko 2024 / 2025

Egypt Salary & Income Tax Calculator (حاسبة المرتبات والضرائب المصرية)

احسب صافي المرتب في مصر بعد خصم التأمينات الاجتماعية (11%)، ضريبة كسب العمل المتدرجة، والإعفاء الشخصي الجديد (20 ألف جنيه)

Bangladesh Salary & Income Tax Calculator (বাংলাদেশ বেতন ও আয়কর ক্যালকুলেটর)

Calculate net take-home salary in Bangladesh with NBR progressive tax slabs (5%-25%), female/senior exemptions, City Corporation minimum tax, and PF

Kenya PAYE & Net Salary Calculator (KRA Mshahara Calculator)

Calculate Kenyan net take-home pay with KRA PAYE tax bands (10%-35%), SHIF (2.75%), NSSF Tier I & II, Affordable Housing Levy (1.5%), and Personal Relief

Israel Net Salary Calculator (מחשבון שכר נטו ומס הכנסה)

Calculate Israeli take-home pay with Mas Hachnasah tax brackets (10%-50%), Bituach Leumi, Health Tax, Nekudot Zikuy credit points, and Keren Hishtalmut

Czech Republic Net Salary Calculator (Kalkulačka čisté mzdy)

Calculate Czech net wage from gross with Sociální pojištění (7.1%), Zdravotní pojištění (4.5%), progressive PIT (15%/23%), Sleva na poplatníka, and child tax credits

Romania Net Salary Calculator (Calculator Salariu Net)

Calculate Romanian net salary from gross with CAS pension (25%), CASS health (10%), income tax (10%), personal deduction, and IT exemption up to 10k RON

Interactive LaTeX Equation Editor & Math Palette

Create, edit, and render scientific formulas with visual symbol palettes, live KaTeX typesetting, MathML export, and high-resolution PNG downloads

Audio Pitch, Equalizer & Tempo Studio

Fine-tune sound with a 10-band graphic equalizer, pitch shifter, tempo scaler, volume booster, and lossless WAV export 100% in-browser

IEEE 754 Floating-Point & Binary Studio

Inspect and convert 32-bit single and 64-bit double precision floats with interactive bit flippers, hex values, and step-by-step mathematical derivation

Greece Net Salary & EFKA Calculator (Υπολογισμός Καθαρού Μισθού & ΕΦΚΑ)

Calculate Greek net salary from gross with EFKA social security (13.87%), progressive income tax (9%-44%), tax-free allowances for children, and 14 vs 12 payment periods

Hungary Net Salary Calculator (Magyar Bérkalkulátor 2024/2025)

Calculate Hungarian net wage from gross with TB social security (18.5%), flat SZJA (15%), under-25 tax exemption, and family tax allowances

Ukraine Salary & Military Tax Calculator (Калькулятор Зарплати України)

Calculate Ukrainian net salary from gross with PIT (18%), Military Tax (1.5%/5%), Diia City IT regime, and employer ESV (22%)

Peru Net Salary & 5ta Categoría Calculator (Calculadora de Sueldo Neto)

Calculate Peruvian net salary with AFP (Integra, Prima, Profuturo, Habitat) vs ONP (13%), SUNAT 5ta categoría (7 UIT deduction), and 14 payments with Gratificaciones

JWT Debugger & Security Token Inspector

Decode, inspect claims, verify HMAC-SHA256 signatures, and check token expiry 100% client-side with native Web Crypto API and zero server uploads

Cron Expression Schedule Visualizer & Guru

Translate 5-field cron syntax into plain English, inspect individual time parameters, and preview the next 8 execution timestamps in your local timezone

CSS Smooth Shadow & Glassmorphism Studio

Craft silky multi-layer realistic box shadows and frosted glass backdrop-filter surfaces with live canvas preview and instant CSS / Tailwind export

EXIF Metadata & GPS Privacy Cleaner

Inspect hidden camera metadata and GPS coordinates inside your photos, then strip all personal tracking tags 100% client-side before sharing online

Morocco Net Salary & CNSS Calculator (Calculateur Salaire Net Maroc - حاسبة الأجور)

Calculez le salaire net au Maroc avec les cotisations CNSS (4,48%), l'AMO (2,26%), les frais professionnels (35%) et le barème progressif de l'IGR

Bulgaria Net Salary & Flat Tax Calculator (Калкулатор за Заплата: Бруто - Нето)

Calculate Bulgarian net salary from gross with DOO social insurance (13.78%), the famous 10% flat tax, and child tax relief

Slovakia Net Salary Calculator (Kalkulačka čistej mzdy Slovensko)

Calculate Slovak net wage from gross with health insurance (4%), social security (9.4%), NČZD tax-free allowance (470.54 €), and child tax bonus

Ecuador Net Salary & IESS Calculator (Calculadora de Sueldo Neto Ecuador)

Calculate Ecuadorian net salary with IESS personal contribution (9.45%), SRI income tax with family expense rebates, décimo tercero, and décimo cuarto

Bcrypt Password Hash Generator & Verifier Studio

Generate secure Blowfish Bcrypt password hashes ($2b$, $2a$, $2y$) with customizable work cost factor (4-14) and verify hashes 100% client-side

Audio BPM Tap Tempo & Online Metronome Studio

Find the exact BPM of any song with rolling tap tempo, practicing with an interactive Web Audio metronome across multiple time signatures

DNS-over-HTTPS (DoH) Record Inspector

Resolve and inspect domain DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA) directly from your browser using Cloudflare and Google DoH APIs

Color Blindness & Daltonism Vision Simulator

Test and visualize designs, charts, and photos as seen by individuals with Deuteranopia, Protanopia, Tritanopia, and Achromatopsia 100% in-browser

Kazakhstan Net Salary & Payroll Studio (Калькулятор зарплаты Казахстан - Жалақы калькуляторы)

Рассчитайте чистую зарплату на руки в Казахстане с учетом ОПВ (10%), ВОСМС (2%), ИПН (10%), вычета 14 МРП и налогов работодателя

Ghana PAYE Salary & SSNIT Tax Studio

Calculate net take-home salary in Ghana under GRA progressive PAYE tax brackets and SSNIT Tier 1 & 2 pension contributions

Croatia Net Salary Calculator (Kalkulator Plaće RH - Bruto u Neto)

Izračunajte neto plaću u Hrvatskoj s Mirovinskim (I. i II. stup 20%), osobnim odbitkom 560 €, gradskim poreznim stopama i zdravstvenim osiguranjem

Sri Lanka Salary Calculator (APIT, EPF & ETF)

Compute net in-hand salary in Sri Lanka with Inland Revenue APIT tax slabs (6% to 36%), EPF (8% & 12%), and ETF (3%)

IP Subnet & CIDR Network Calculator Studio

Compute network addresses, usable host ranges, broadcast IPs, wildcard masks, and binary layouts 100% in-browser

RegEx Visualizer & Railroad Diagram Studio

Deconstruct regular expressions into interactive visual railway state diagrams and test matches with zero server lag

Markdown Table Formatter & CSV Converter Studio

Auto-align pipes, edit spreadsheet tables, and convert between Markdown, HTML, CSV, and JSON 100% in-browser

CSS Cubic-Bezier Curve & Animation Studio

Design custom cubic-bezier easing curves, simulate spring physics, and generate production CSS transitions & keyframes

Algeria Net Salary & IRG Tax Studio (Calculateur Salaire Net Algérie - حاسبة الأجور الجزائر)

Calculez le salaire net en Algérie avec la cotisation CNAS (9%), le barème progressif de l'IRG et l'abattement de 40%

Uruguay Net Salary & IRPF Studio (Calculadora Sueldo Líquido)

Calcula el sueldo líquido en mano en Uruguay con aportes jubilatorios BPS (15%), seguro de salud FONASA y franjas de IRPF

Serbia Net Salary Calculator (Kalkulator Plate Srbija - Bruto u Neto)

Izračunajte neto platu u Srbiji sa doprinosima za PIO (14%), zdravstvo (5.15%), neoporezivim iznosom od 25.000 RSD i porezom od 10%

GCC End of Service Gratuity & Indemnity Studio (Kuwait, Qatar, Bahrain, Oman)

Calculate End of Service Benefits (EOSB) and labor indemnity across Kuwait, Qatar, Bahrain, and Oman

Subtitle SRT & VTT Time Shifter Studio

Shift movie and video subtitles forwards or backwards with millisecond precision and convert between SRT and VTT

PDF Page Numberer & Bates Stamping Studio

Add sequential legal Bates stamps or custom page numbering to PDF documents 100% in-browser

SVG Multi-Resolution Asset Generator Studio

Convert vector SVGs into complete multi-resolution icon packs (16x16 to 512x512) for Web, iOS, and Android

HTTP Header & Security Inspector Studio

Audit HTTP response headers against OWASP security standards and generate hardened server configurations

Ethiopia Salary & Income Tax Studio (የኢትዮጵያ የደሞዝ እና ግብር ማስያ - Proclamation 979/2016)

Calculate net take-home salary in Ethiopia with 7% employee pension, 11% employer pension, and Proclamation 979/2016 tax brackets

Nepal Salary & SSF Income Tax Studio (नेपाल तलब तथा सामाजिक सुरक्षा कर क्याल्कुलेटर)

Calculate net take-home salary in Nepal with Social Security Fund (SSF 11%/20%), married vs individual tax slabs, and CIT/EPF

Panama Net Salary & DGI Tax Studio (Calculadora Salario Neto Panamá - Seguro Social e ISR)

Calcule el salario neto en Panamá con Seguro Social CSS (9.75%), Seguro Educativo (1.25%) e Impuesto sobre la Renta DGI

Costa Rica Net Salary & CCSS Tax Studio (Calculadora Salario Neto Costa Rica - CCSS y Renta)

Calcule el salario neto en Costa Rica con cargas sociales de la CCSS (10.67%) e Impuesto sobre la Renta progresivo

Private HAR Waterfall Analyzer & HTTP Archive Inspector

Analyze HTTP Archive (.har) files with interactive waterfall timelines, TTFB metrics, and client-side token redacting

RFC 9562 UUIDv7 & ULID Sortable ID Generator & Timestamp Decoder

Generate chronologically sortable UUIDv7 and Crockford Base32 ULIDs with millisecond timestamp decoding and WebCrypto security

Multi-Dialect SQL Beautifier, Formatter & Minifier Studio

Format, beautify, and minify SQL queries across PostgreSQL, MySQL, SQLite, T-SQL, Snowflake, and BigQuery dialects

Universal JSON to TypeScript, Pydantic, Go & Rust Type Engine

Convert JSON payloads into TypeScript interfaces, Python Pydantic V2 models, Go structs, and Rust Serde types

United States 50-State Take-Home Paycheck & Tax Studio (IRS W-4 & FICA)

Calculate US take-home pay with Federal IRS tax brackets, FICA Social Security cap, Medicare surtax, and all 50 states

UK Take Home Pay & HMRC PAYE Tax Studio (2024–2026 - £100k Taper & NIC 8%)

Calculate UK take-home salary with HMRC PAYE income tax, 8% Class 1 National Insurance, £100k taper, and Student Loan Plans 1-5

Deutschland Brutto-Netto-Rechner & Gehaltsrechner (Steuerklasse I–VI & Sozialabgaben)

Berechnen Sie Ihr Nettogehalt in Deutschland mit Steuerklasse 1 bis 6, Rentenversicherung (9,3%), Krankenversicherung, PV und Solidaritätszuschlag

India Income Tax & In-Hand Salary Studio (Budget 2024–2026 Old vs New Regime)

Calculate in-hand salary in India with Budget 2024 New Regime (₹75,000 standard deduction, 87A rebate) vs Old Regime (80C, 80D, HRA)

France - Calculateur Salaire Brut en Net & Prélèvement à la Source (Cadre & Non-Cadre)

Calculez le salaire net en France avec cotisations salariales Urssaf (~22% non-cadre / ~25% cadre) et Prélèvement à la source (PAS)

Brasil - Calculadora de Salário Líquido CLT (Tabela INSS Progressivo & IRPF 2024–2026)

Calcule o salário líquido na CLT com tabela progressiva do INSS (até R$ 7.786,02), IRPF, dependentes e depósito do FGTS

España - Calculadora de Sueldo Neto & Retenciones IRPF (Seguridad Social & CC.AA.)

Calcule su sueldo neto en España con cotizaciones a la Seguridad Social (4,70% comunes, desempleo, MEI) e IRPF por Comunidad Autónoma

Italia - Calcolo Stipendio Netto & Nuova IRPEF a 3 Scaglioni (Taglio Cuneo Fiscale & INPS)

Calcola lo stipendio netto mensile in Italia con la nuova IRPEF a 3 scaglioni (23%, 35%, 43%), taglio del cuneo fiscale INPS e TFR

Uzbekistan Salary & NDFL Tax Studio (Ish Haqi & Soliqlar)

Hisoblang sof ish haqi O'zbekistonda: JShODS (NDFL 12%), INPS jamg'arib boriladigan pensiya (0.1%), va ijtimoiy soliq (12%)

Tanzania Salary & TRA PAYE Studio (NSSF & WCF)

Compute Tanzania net take-home salary with TRA PAYE monthly progressive slabs (0% to 30%), NSSF pension (10%), and WCF

Uganda Salary & URA PAYE Studio (NSSF & LST)

Calculate Uganda net salary with Uganda Revenue Authority PAYE progressive tax brackets (0% to 40%), NSSF (5%), and Local Service Tax

República Dominicana - Calculadora Sueldo Neto TSS & DGII

Calcula el salario neto en República Dominicana con retenciones TSS (AFP 2.87%, SFS 3.04%), escalas ISR DGII y Salario de Navidad

Guatemala - Calculadora Salario Líquido IGSS & SAT

Calcula tu sueldo líquido en Guatemala: cuota laboral IGSS (4.83%), Bono Incentivo Q 250, retención ISR SAT, Bono 14 y Aguinaldo

Tunisie - Calculateur Salaire Net CNSS & IRPP (Barème Fiscal)

Calculez le salaire net en Tunisie avec cotisations CNSS (9.18%), barème progressif IRPP (0% à 35%), CSS 1% et déductions chef de famille

Azərbaycan Əmək Haqqı Kalkulyatoru (Gəlir Vergisi, DSMF & İTS)

Hesabla xalis əmək haqqı: Qeyri-neft sektoru 8,000 AZN güzəşti, DSMF pensiya (3%/10%), icbari tibbi sığorta (İTS 2%) və işsizlik

Jordan Salary & SSC Tax Studio (حاسبة الراتب الصافي الأردن)

احسب الراتب الصافي في الأردن مع اشتراكات الضمان الاجتماعي (SSC 7.5%) وضريبة الدخل مع الإعفاءات الشخصية والعائلية

JSON Diff & Semantic Tree Comparator Studio

Visual side-by-side JSON semantic tree diff, structural comparisons, added/removed/mutated keys detector with 100% client-side privacy

SVG Path Optimizer & Visualizer Studio

Inspect, preview, minify, and strip redundant coordinate decimals from raw SVG path data with sub-pixel precision control

Web Audio Noise & Binaural Synthesizer Studio

Continuous in-browser DSP sound generator: Brownian (1/f²), Pink (1/f), White noise, 432 Hz sleep drones, and Delta/Theta binaural beats

Bcrypt Hash Generator & Work Factor Benchmark Studio

Generate RFC-compliant Bcrypt hashes, verify work factors (cost 6-14), inspect salt/digest components, and benchmark client CPU hashing power

中国五险一金及个人所得税计算器 (China Tax & Social Insurance)

全国主要城市（北上广深）养老、医疗、失业保险、住房公积金比例，5000元起征点与七级累进个税

人民币大写金额转换器 (RMB Financial Numeral Converter)

秒级转换阿拉伯数字为银行支票、发票凭证与合同法定大写汉字（壹、贰、叁、肆、元、角、分、整）

법정 퇴직금 계산기 (Korea Severance Pay / Toejikgeum Calculator)

근로기준법 제34조 법정 퇴직금 산식: 1일 평균임금 × 30일 × (재직일수 / 365) 및 퇴직소득세 자동 산출

연차수당 계산기 (Korea Annual Leave Allowance / Yeon-cha Sudang)

근로기준법 제60조 미사용 연차유급휴가 수당: 월 통상임금 및 소정근로시간(209시간) 기준 통상시급 계산

ふるさと納税 限度額計算機 (Japan Furusato Nozei Limit Studio)

総務省法定計算式に準拠：年収と家族構成から実質自己負担2,000円で寄附できる上限額と住民税控除を試算

和暦・西暦・年齢早見表変換器 (Japan Wareki to Seireki Studio)

令和・平成・昭和・大正・明治と西暦の双方向変換、満年齢、干支、履歴書用入学・卒業年度早見表

Калькулятор расчета отпускных онлайн (Russian Vacation Pay Studio)

Расчет отпускных по ст. 139 ТК РФ и Положению № 922: среднедневной заработок с коэффициентом 29.3 и вычет НДФЛ 13%

Калькулятор больничного листа и декретных (Russia Sick Leave Studio)

Расчет пособия по временной нетрудоспособности по закону № 255-ФЗ: стаж (60%/80%/100%), лимиты СФР и 3 дня за счет работодателя

Concrete Slab, Footing & Bag Estimator Studio

Calculate concrete volume in cubic yards, cubic meters, pre-mixed 80lb/60lb/25kg bags, rebar grid, and ready-mix truck costs

HVAC BTU Heating & Cooling Load Sizing Studio

Manual J residential thermal load estimator: room volume, climate zone, insulation R-values, window exposure, and AC tonnage

Coast FIRE Financial Independence Visualizer Studio

Calculate your Coast FIRE milestone: the exact portfolio amount today to retire securely with 0% future contributions

EXIF Metadata Inspector & Privacy Stripper Studio

100% in-browser photo privacy sanitizer: inspect and strip GPS location, camera serial numbers, and device timestamps

Image Compressor

Compress JPG, PNG, and WebP images locally with custom quality control

Image Resizer

Resize image dimensions by pixels or percentage with aspect ratio lock

Image Format Converter

Convert images between JPG, PNG, WebP, and other formats instantly

Image Cropper

Crop and frame photos with freeform or standard aspect ratios

Image Metadata & Dimension Inspector

Inspect image dimensions, color space, file size, and EXIF metadata

Image Color Palette Extractor

Extract dominant color palettes and HEX codes from any photo

Social Media Image Resizer

Resize photos for YouTube, Instagram, Twitter, Facebook, and LinkedIn

PDF Merger

Merge multiple PDF documents into a single organized PDF file

PDF Splitter & Page Extractor

Extract specific pages or split a PDF into separate files

Image to PDF Converter

Convert JPG, PNG, and WebP images into a single formatted PDF document

PDF Page Rotator & Organizer

Rotate sideways or upside-down PDF pages by 90, 180, or 270 degrees

PDF Page Numberer

Add page numbers, headers, and footers to PDF pages with customizable positioning

PDF Watermark Tool

Stamp custom text watermarks, confidentiality markings, and stamps across PDF pages

PDF Page Remover

Delete unwanted or sensitive pages from any PDF document and export a clean version

PDF Metadata & Document Info Editor

Inspect, edit, or wipe Title, Author, Subject, Keywords, and Creator metadata from PDFs

PDF to Text Extractor

Extract readable plain text streams and copyable content from PDF documents

Text to PDF Converter

Convert rich formatted text, notes, bold headings, and colored text into high-fidelity PDF documents

Word & Character Counter

Real-time word, character, sentence, paragraph count, and reading time

Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, and more

Duplicate Line Remover & Sorter

Remove duplicate lines, sort alphabetically, and clean text lists

JSON Formatter, Validator & Minifier

Format, validate, beautify, and minify JSON with real-time error detection

Base64 Encoder & Decoder

Encode text and files to Base64 or decode Base64 strings to plain text

JWT Decoder & Inspector

Decode and inspect JSON Web Tokens locally with expiration warnings

URL Encoder & Decoder

Encode special characters for URL query parameters or decode percent-encoded URLs

Cryptographic Hash Generator

Generate SHA-256, SHA-512, SHA-1, and MD5 cryptographic hashes from text

Color Format Converter (HEX, RGB, HSL, CMYK)

Convert colors between HEX, RGB, HSL, and CMYK with live preview and contrast rating

Number Base Converter (Binary, Decimal, Hex, Octal)

Convert numbers between Binary, Decimal, Hexadecimal, and Octal bases

Date Difference & Duration Calculator

Calculate the duration and number of days and business days between two dates

Universal Unit Converter

Convert measurements for Length, Weight, Temperature, Data Storage, Speed & Area

Percentage & Margin Calculator

Calculate percentages, percentage change, profit margins, and markups instantly

Tip & Bill Split Calculator

Calculate restaurant tips, custom percentages, and split bills fairly among friends

Loan & EMI Estimator

Calculate monthly loan EMI payments, total interest, and yearly amortization schedule

Custom QR Code Generator

Create custom QR codes for URLs, Wi-Fi, text, and vCards with instant SVG/PNG download

Barcode Generator (CODE128, EAN, UPC)

Generate standard scannable barcodes in CODE128, EAN-13, UPC, and CODE39 formats

UUID / GUID Generator (v4)

Generate cryptographically random UUID v4 identifiers in single or bulk batches

UTM Campaign Link Builder

Build trackable Google Analytics UTM URLs for marketing campaigns and social media

Aspect Ratio Calculator

Calculate proportional dimensions, simplified ratios (16:9, 4:3, 9:16), and scaling

Subtitle SRT Time Shifter & Sync Helper

Shift all subtitle timestamps forward or backward to fix video audio desync

Emoji Copy & Paste Library

Instant search and 1-click copy for 3,900+ emojis, unicode symbols, kaomoji, and special characters

Special Characters & Unicode Symbols Library

Copy special characters, arrows, currency, Greek letters, math symbols, and unicode text

Kaomoji, Emoticons & Aesthetic Text Symbols

Japanese kaomoji emoticons, aesthetic bio borders, and trending emoji combos for creators

File Checksum & Integrity Verifier

Calculate and verify SHA-256, SHA-512, and MD5 checksums of any local file

MIME Type & File Extension Lookup

Look up MIME types, HTTP Content-Types, and file extension associations

CSV Viewer & Table Editor

View, sort, filter, and edit CSV and TSV spreadsheets directly in your browser

Markdown Live Editor & Previewer

Write and preview GitHub-Flavored Markdown with instant side-by-side HTML rendering

Text to PDF Converter

Convert plain text, notes, and code into clean, formatted paginated PDF documents

Markdown to HTML Converter

Compile Markdown syntax into clean, standard semantic HTML markup

Text File Merger

Merge multiple text, CSV, markdown, and log files into a single unified document

Text File Splitter

Split large text and log files into multiple downloadable parts by line count

Audio Metadata & Properties Inspector

Inspect duration, sample rate, channels, bitrate, and playback for audio files

Video Metadata & Resolution Checker

Inspect native resolution, aspect ratio, duration, bitrate, and keyframe snapshots

Video Bitrate & File Size Calculator

Calculate required video bitrate for Discord 8MB/25MB limits, Email, and Web streaming

Video FPS & Frame Time Calculator

Calculate exact frame render time, total frame count, and SMPTE timecodes

BMI & Ideal Weight Calculator

Calculate Body Mass Index, health category, ideal weight range, and BMI prime

Regular Expression (Regex) Tester

Test, debug, and validate JavaScript regular expressions with real-time match highlighting

HTML & CSS Minifier

Compress and minify HTML and CSS stylesheets to reduce bandwidth and speed up page loading

Text Cleaner & Whitespace Sanitizer