Free chemistry calculators — molarity, pH, gas laws, stoichiometry and more, each with steps shown.
Calculate molarity (M) from moles of solute and liters of solution.
Calculate molality (m) from moles of solute and kilograms of solvent.
Find pH, pOH and hydroxide concentration from [H+].
Solve M1V1 = M2V2 for stock solution dilutions.
Solve PV = nRT for pressure, volume, moles or temperature.
Compute remaining quantity after exponential decay.
Compare actual yield to theoretical yield as a percent.
Get molecular weight from a chemical formula like H2O.
Find the simplest whole-number ratio from percent composition.
Solve MaVa = MbVb for acid-base titration volumes.
Henderson-Hasselbalch pH for buffer solutions.
Identify the limiting reactant and the leftover excess.
Chemistry runs on arithmetic — moles, concentrations, yields and gas laws are all calculations wearing lab coats. Our Chemistry Calculators collection covers the 12 computations students and professionals reach for most: from molarity and molality through pH and buffers, dilutions and titrations, the ideal gas law, half-life decay, percent yield, molar mass, empirical formulas and limiting reactants. Every calculator shows its step, so you learn the method — not just the answer.
Use the search box above to filter the 12 tools instantly, or browse the cards. Each page carries a full explainer — the formula, worked examples with real numbers, common mistakes, and FAQs — at the CalculatorSoup depth standard.
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Last updated: October 12, 2026