Percent Yield Calculator
Actual vs theoretical reaction yield.
Enter your values
ⓘ Live results
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.
Worked example
Using the values the calculator loads with:
Inputs
- Actual yield8.6 g
- Theoretical yield10.4 g
Results
- Percent yield82.69%
- Mass lost1.8 g
- Percent lost17.31%
- QualityGood
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.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.