Stoichiometry Calculator
Calculate limiting reactant and theoretical yield from chemical equations
How to use Stoichiometry Calculator
- 1Enter a balanced chemical equation and the amount of one reactant or product.
- 2Let the tool use mole ratios from the coefficients to find the others.
- 3Read the moles or mass of the substance you asked about.
Balancing amounts in reactions
Amount B = Amount A x (coefficient B / coefficient A)Stoichiometry uses the coefficients of a balanced equation as mole ratios to predict how much product forms or reactant is needed.
It assumes the reaction goes to completion with no side reactions, which real experiments only approximate.
Frequently asked questions
Why must the equation be balanced?
Conservation of mass requires equal atoms on both sides, and the coefficients give the mole ratios.
What is the limiting reactant?
The reactant that runs out first, which caps how much product can form.
Does this predict actual yield?
It gives the theoretical yield; real yield is lower due to losses and incomplete reaction.
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