Percent yield = (actual yield ÷ theoretical yield) × 100
Actual yield = amount of product actually obtained
Theoretical yield = maximum amount of product predicted by stoichiometry
Ensure both yields are in the same units
Divide actual yield by theoretical yield
Multiply the result by 100 to get percent yield
Percent yield less than 100% means not all reactant was converted to product
Percent yield equal to 100% means actual yield equals theoretical yield
Percent yield greater than 100% usually indicates measurement or purity errors