How this calculator works
Percentage yield compares isolated product with the maximum predicted by stoichiometry. The theoretical mass must come from the limiting reagent. Use matching product identity, purity and hydration state. Zero actual yield is valid. A result above 100% can indicate residual solvent, contamination, incorrect stoichiometry or measurement error; this calculator reports it without treating it as ideal recovery.
Formula
Yield fraction = actual product mass/theoretical product mass. Actual mass = theoretical mass x yield fraction.
Worked example
Recovering 15 g from a theoretical 20 g gives 75%. Recovering 40 g from 80 g gives 50%.
Advertisement
Frequently asked questions
Why can yield exceed 100%?
Recovered material may contain water, solvent or impurities, or the theoretical yield may be wrong.
Can theoretical yield be zero?
A percentage relative to zero theoretical mass is undefined.
Is percentage yield the same as purity?
No. Purity describes the product composition; percentage yield describes recovery compared with the theoretical maximum.