Percent Yield Calculator
Actual vs theoretical product mass.
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Formula
Yield % = (actual ÷ theoretical) × 100
Percent yield compares isolated product to the stoichiometric maximum from balanced equations.
Worked example
42 g obtained from 50 g theoretical is 84% yield — typical for organic syntheses.
Where this can give the wrong answer
- Theoretical yield must come from stoichiometry, not guesswork.
- Yields over 100% suggest impurity, solvent, or weighing error.
- Mass vs moles — use consistent basis for both yields.
FAQ
- Side reactions, incomplete conversion, transfer losses, and purification discard material.