Percent Yield Calculator
- Convert both yields into grams internally.
- Apply the formula % yield = (actual / theoretical) × 100.
- Substitute values: —
- Result: —
- Percent yield = (actual yield ÷ theoretical yield) × 100.
- Unit switching is local to each field and recalculates from the saved source value.
Use this Percent Yield Calculator to compare the product actually obtained in an experiment with the maximum amount predicted by stoichiometry.
Percent Yield Formula
Percent yield = (actual yield ÷ theoretical yield) × 100
Actual yield is the amount of product collected. Theoretical yield is the maximum amount expected from the balanced chemical equation and limiting reagent.
Both values must represent the same product. They may use different mass units because the calculator converts milligrams, grams, and kilograms before calculating.
Example
Suppose the actual yield is 12.5 g and the theoretical yield is 15 g.
Percent yield = (12.5 ÷ 15) × 100
Percent yield = 83.33%
This means 83.33% of the theoretically possible product was obtained.
Understanding the Result
- Below 100%: Less product was collected than expected.
- 100%: Actual yield equals theoretical yield.
- Above 100%: Check for moisture, retained solvent, impurities, incomplete drying, or measurement error.
This calculator requires the actual and theoretical yields to be known. It does not identify the limiting reagent or calculate theoretical yield from a chemical equation.