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Percent Yield Calculator

Divide the actual yield by the theoretical yield to find the percent yield, and see how much product was lost along the way.

Percent yield calculator

Percent yield: —
Yield lost: —
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The theoretical yield is set by the limiting reagent, the reactant that runs out first.

How to use the Percent Yield Calculator

  1. Enter the actual yield you obtained from the reaction.
  2. Enter the theoretical yield and pick the units you are working in.
  3. Read the percent yield and the amount of product lost.

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Frequently Asked Questions

Common questions about the free online percent yield calculator.

Percent yield compares the amount of product you actually obtained with the maximum predicted by theory, as a percentage.
Divide the actual yield by the theoretical yield and multiply by 100. Getting 8.5 grams from a possible 10 grams is 85 percent.
Theoretical yield is the maximum product amount calculated from the balanced equation, based on the limiting reagent being used up.
The limiting reagent is the reactant that runs out first and therefore decides how much product can form. The others are in excess.
It can appear above 100 if the product is wet or impure. A true yield cannot exceed the theoretical maximum from the reaction.
Side reactions, incomplete reaction, losses during filtering or transfer and measurement error all reduce the product you recover.
No. Yields are calculated locally in your browser, so your lab figures never leave your device or reach a server.
Yes. It is completely free, needs no account and there is no limit on how many reactions you check.

Last updated: October 10, 2026