Stoichiometry Calculator
Product moles and mass from reactant amounts and mole ratio.
Enter your values
ⓘ Live results
Results
- Moles of product
- 0.25 mol
- Mass of product
- 14.625 g
- Moles of reactant used
- 0.25 mol
Quick answer
Moles of product = moles of reactant x (product coefficient / reactant coefficient).
n_product = n_reactant x (coeff_product/coeff_reactant)
How to use the Stoichiometry Calculator
- 1Enter the mass and molar mass of your starting reactant.
- 2Enter the coefficients of the reactant and product from the balanced equation.
- 3Enter the product's molar mass to see the mass of product formed.
Worked example
Using the values the calculator loads with:
Inputs
- Reactant mass10 g
- Reactant molar mass40 g/mol
- Reactant coefficient1
- Product coefficient1
- Product molar mass58.5 g/mol
Results
- Moles of product0.25 mol
- Mass of product14.625 g
- Moles of reactant used0.25 mol
Frequently asked questions
What if I have two reactants?
Calculate the product amount from each reactant separately — the smaller value identifies the limiting reagent.
Why do coefficients matter?
They set the mole ratio between reactant and product as required by the balanced chemical equation.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.