Percent Yield Calculator
Use this percent yield calculator to solve for percent yield, actual yield, or theoretical yield from the standard relation.
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Run the calculator.
What This Percent Yield Calculator Helps You Do
This page makes the standard yield equation reversible, so the same tool works during planning, during the experiment, and during the write-up.
That is helpful because yield problems are mostly about choosing the missing variable and keeping units aligned.
How to Calculate Percent Yield Calculator
- Choose what to solve: Use the same equation to find percent yield, actual yield, or theoretical yield.
- Keep units consistent: Actual and theoretical yield must use the same unit.
- Interpret efficiency: Compare the result with expected losses and reaction conditions.
Percent Yield Calculator Formula
| Variable | Meaning | Unit |
|---|---|---|
| % yield | Reaction efficiency relative to theory | % |
| actual yield | Measured product obtained | same as theoretical yield |
| theoretical yield | Maximum predicted product | same as actual yield |
Use the worked examples below to check how the formula behaves with real values. If the result looks unexpected, verify the unit assumptions and the meaning of each variable before interpreting the answer.
Worked Examples
- Actual yield: 7.5 g
- Theoretical yield: 9.0 g
Result: 83.33%
The experiment produced a little over four-fifths of the theoretical amount.
- Actual yield: 18 g
- Percent yield: 90%
Result: 20 g
Theoretical yield comes from dividing by the fractional yield.
How to Interpret Your Results
| Range | Meaning | Action |
|---|---|---|
| < 50% | Low yield | Review losses, side reactions, and isolation steps. |
| 50-90% | Moderate yield | Common in many classroom and practical reactions. |
| > 90% | High yield | Check values carefully if the result approaches or exceeds 100%. |
Frequently Asked Questions
References
Last reviewed: March 2026