Chemistry Calculators & Tools
Interactive general chemistry, mole calculations, stoichiometry, solutions, acids and bases, gas laws, atomic theory, thermochemistry, and chemical equation balancing solvers. Aligned with AP Chemistry, IB Chemistry, General College Chemistry, and Organic & Inorganic laboratory courses.
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
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