Molar mass, mole conversion, limiting reagent, and yield calculators. Browse our free stoichiometry tools below — all calculators are instant, accurate, and require no sign-up.
Actual Yield Calculator — Calculate actual yield from theoretical yield and percent yield. Determine real product amounts accounting for reaction efficiency and side reactions.
Atom Economy Calculator — Calculate atom economy for chemical reactions. Measure reaction efficiency by comparing useful product mass to total reactant mass for green chemistry.
Avogadro's Number Calculator — Convert between moles, particles, atoms, molecules, and formula units using Avogadro's number (6.022 × 10²³). Essential stoichiometry tool.
Chemical Equation Balancer Calculator — Balance chemical equations by entering reactants and products. Get stoichiometric coefficients, molar ratios, and conservation of mass verification.
Grams to Moles Calculator — Convert grams to moles and moles to grams using molar mass. Supports all elements and common compounds with an extensive molecular weight database.
Molar Mass Calculator — Calculate molar mass from chemical formulas with parentheses support and all 118 elements. Includes grams-to-moles conversion, composition breakdown, percent bars, and common compound presets.
Molarity Calculator — Calculate molarity, moles, volume, or mass of solute for solution preparation. Includes dilution calculations and common solution recipes.
Molar Ratio Calculator — Calculate molar ratios between reactants and products in chemical reactions. Determine stoichiometric proportions for any balanced equation.
Mole Fraction Calculator — Calculate mole fractions for mixtures and solutions. Determine composition, partial pressures, and colligative property inputs from component moles.
Mole Calculator — Universal mole converter: between moles, grams, particles, and volume of gas at STP. Complete stoichiometry conversion tool for chemistry.
Moles to Atoms Calculator — Convert moles to atoms, molecules to atoms, and grams to atoms. Calculate total atom counts in compounds with multi-atom molecules.
Molecular Weight Calculator — Calculate molecular weight from chemical formula. Supports elements, compounds, hydrates, and polymers with a full periodic table database.
Percent Composition Calculator — Calculate the percent composition by mass of each element in a chemical compound. Essential for empirical formula determination and analytical chemistry.
Percent Yield Calculator — Calculate percent yield from actual and theoretical yields. Compare reaction efficiency across conditions, identify limiting reagents, and benchmark synthesis performance.
Percentage Concentration to Molarity Calculator — Convert weight/volume percent, weight/weight percent, and volume/volume percent concentrations to molarity. Includes density and dilution support.
PPM to Molarity Calculator — Convert parts per million (ppm), parts per billion (ppb), and mg/L to molarity. Essential for environmental chemistry, water quality, and trace analysis.
Theoretical Yield Calculator — Calculate theoretical yield from limiting reagent, stoichiometry, and molar masses. Compare reagents, identify excess, and plan synthesis quantities.