Percent Yield Calculator
Actual vs theoretical reaction yield.
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Results
- Percent yield
- 82.69%
- Mass lost
- 1.8 g
- Percent lost
- 17.31%
- Quality
- Good
Quick answer
Percent yield is actual yield divided by theoretical yield times 100; above 100% signals impurity or error.
% yield = Actual ÷ Theoretical × 100
How to use the Percent Yield Calculator
- 1Weigh the purified product you obtained.
- 2Calculate theoretical yield from stoichiometry.
- 3Enter both masses in the same unit.
Frequently asked questions
Can yield exceed 100%?
Only if the product is wet or contaminated — dry and reweigh.
What is a normal yield?
70–90% for a well-run synthesis; multi-step routes are much lower.