Percent Yield Calculator
Calculate percent yield from actual and theoretical yield in a chemical reaction.
Percent Yield Mathematics
Percent yield calculator computes the percentage yield of a chemical reaction from actual and theoretical yield in grams.
Percent yield measures how efficiently a chemical reaction actually performed compared to the maximum theoretical output calculated from stoichiometry. Real reactions almost always yield less than 100% due to side reactions, incomplete reactions, and product loss during purification.
- 1Enter the actual yield obtained from the experiment, in grams.
- 2Enter the theoretical yield calculated from the balanced equation, in grams.
- 3View the percent yield.
A reaction was predicted to produce 60 grams of product (theoretical yield), but only 45 grams were actually recovered.
Frequently Asked Questions (FAQ)
Yields above 90% are considered excellent, 70-90% good, and below 50% poor for most lab-scale reactions — though acceptable yield varies a lot by reaction type and industrial context.
Side reactions, reversible equilibria, incomplete reactions, and product loss during transfer or purification (filtering, recrystallizing) all reduce actual yield below the theoretical maximum predicted by stoichiometry alone.
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