Limiting Reagent Calculator

How to find the limiting reagent

1. For each reactant, type its formula (or molar mass), the mass you have and its coefficient in the balanced equation.
2. Type the product's formula and coefficient to get the theoretical yield.
3. The limiting reagent appears with the theoretical yield and the mass of each other reactant left over.

Frequently asked questions

How is the limiting reagent found?

Each reactant's moles are divided by its coefficient. The smallest result is the limiting reagent, because it runs out first.

Does the equation need to be balanced?

Yes. The coefficients must come from the balanced equation; the chemical equation balancer can work them out.