Calculators & Math Tools
Free online financial, mortgage, loan, health, math, and everyday calculators with 100% in-browser precision and zero server tracking. All tools run 100% in your browser with zero server uploads and instant processing.
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
BMI & Ideal Weight Calculator
Calculate Body Mass Index, health category, ideal weight range, and BMI prime
Trip Fuel Cost & Mileage Calculator
Calculate total fuel expense, fuel volume needed, and cost per passenger for road trips
Scientific Calculator & History Tape
Advanced math calculator with trigonometric, logarithmic, roots, powers, and interactive history
Fraction Calculator & Step-by-Step Simplifier
Add, subtract, multiply, and divide fractions with irreducible reduction and step-by-step math
Basal Metabolic Rate (BMR) Clinical Calculator
Calculate resting calorie expenditure using Revised Harris-Benedict and Mifflin-St Jeor equations
College & High School GPA Calculator (4.0 & Weighted)
Calculate unweighted 4.0 scale and weighted Honors/AP cumulative GPA with semester course tracking
Basic Calculator (4-Function Office Desk Calculator)
Standard 4-function desk calculator with calculation tape and memory.
Ratio Calculator & Proportional Scaler
Simplify ratios A:B and solve proportional equations A:B = C:D.
Average Calculator (Mean, Median, Mode & Range)
Calculate arithmetic mean, median, mode, and range from numbers.
Date Calculator & Business Days Duration
Calculate calendar days, business workdays, and weeks between dates.
Time Calculator & Hours Duration Adder
Add, subtract, and calculate hours and minutes duration for payroll.
Margin Calculator (Markup vs Profit Margin)
Compare profit margin vs markup percentage and cost price.
Electricity Cost Calculator (Appliance Energy Bill)
Calculate power consumption in kWh and estimated electric bill.
Construction & Concrete Slab Calculator
Calculate cubic yards of concrete, square footage, and bags required.
Statistics Calculator (Standard Deviation & Variance)
Calculate sample/population standard deviation, variance, and IQR.
Probability & Combinatorics Calculator (nPr & nCr)
Calculate permutations (nPr), combinations (nCr), and event odds.
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