Stoichiometry & gases · SL/HL
Percentage Yield Calculator
Enter actual and theoretical yield using the same quantity and unit.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
percentage yield = experimental yield / theoretical yield × 100%
| Symbol | Meaning |
|---|---|
| experimental | Measured amount of desired product. |
| theoretical | Maximum amount predicted from stoichiometry. |
When to use this calculator
Values above 100% can signal impurities, retained solvent, measurement error or an incorrect theoretical calculation; they are not automatically impossible data.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- Percentage yield = experimental/theoretical × 100
- = 8.2 / 10 × 100 = 82%
82%
Common mistakes
- Use matching units and the same definition of product for both quantities.