Percent Yield Calculator

Calculate percent yield, actual yield or theoretical yield for a reaction.

Calculator

Percent yield = (actual yield / theoretical yield) × 100. Keep actual and theoretical yields in the same unit.

Calculate
Percent yield80%
Actual yield8
Theoretical yield10

Formula and assumptions

percent yield = (actual yield / theoretical yield) × 100

The result compares an observed product quantity with the theoretical product quantity calculated from stoichiometry. Use the same unit for both yields.

Assumption: Actual and theoretical yields use the same unit and refer to the same product.

Variables and units

  • actual yield — observed product amount
  • theoretical yield — maximum predicted product amount
  • % yield — actual divided by theoretical yield (%)

Worked example

An actual yield of 8 g from a theoretical yield of 10 g is 80%.

Important limits

The tool does not determine theoretical yield from a chemical equation.

Reference and related tools

OpenStax: Reaction stoichiometry. Return to Chemistry Calculators for the other tools in this group.