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Mihsaba›Chemistry›Percent Yield Calculator

Percent Yield Calculator

Calculate percent yield from actual and theoretical yield, with the amount difference and percentage shortfall relative to theoretical yield.

Actual and theoretical yield must use the same unit; values above 100% can reflect moisture, impurities or measurement error.

How to use

Percent yield compares the product actually obtained with the theoretical maximum predicted by stoichiometry.

  1. Enter actual yield.
  2. Enter theoretical yield in the same unit.
  3. Calculate percentage.
  4. Review the difference.

How it is calculated

%Y=(actual/theoretical)×100

Example

8.5 g actual from 10 g theoretical gives 85%.

Important notes

The theoretical yield should itself come from the limiting reagent and a correctly balanced reaction.

Frequently asked questions

Can yield exceed 100%?

Mathematically yes if actual exceeds theoretical, but that calls for checking moisture, impurities, measurement or the theoretical calculation.

Can I use moles instead of grams?

Yes, if actual and theoretical use the same basis and unit.

What does negative difference mean?

The entered actual yield exceeds theoretical.