Chemistry

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Actual Yield Calculator.

Calculate percent yield from actual and theoretical product amounts.

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Set your values

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Percent yield: 80 %

Percent yield

80.000%
Yield fraction: 0.8

Yield fraction

0.800000

Educational formula calculator. Keep units consistent; chemistry procedures, concentrations, and safety decisions require qualified laboratory guidance. Never mix cleaning products.

Use Cases

Assess reaction efficiency

Determine how efficient a chemical reaction is by comparing the actual product obtained to the theoretical maximum. This helps in optimizing reaction conditions.

Example: If theoretical yield is 10 g and actual yield is 8 g, percent yield is 80%.

Quality control in synthesis

In industrial or lab settings, use percent yield to monitor the consistency and quality of synthesis processes, identifying losses or errors.

Example: Checking each batch's percent yield to ensure it meets the expected range.

Frequently Asked Questions

What is percent yield and how is it calculated?
Percent yield is the ratio of actual yield to theoretical yield, expressed as a percentage. It is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. This calculator does that for you.
Can I use different units for actual and theoretical yield?
No, the calculator requires both yields to be in the same units, either mass or mol. Ensure you convert to the same unit before entering values.
What does a percent yield greater than 100% mean?
A percent yield above 100% typically indicates experimental error, such as impurities, incomplete drying, or measurement inaccuracies. It is not physically possible to obtain more product than theoretically predicted.

Tips & Common Mistakes

Tips

  • Ensure both yields are in the same unit (mass or mol) before entering them.
  • Use the same precision for both values to avoid rounding errors.
  • Double-check your theoretical yield calculation from stoichiometry before using the calculator.
  • Percent yield is a ratio, so it is unitless; the calculator handles the conversion automatically.

Common Mistakes to Avoid

  • Mixing units, e.g., entering actual yield in grams and theoretical in moles, which leads to incorrect results.
  • Using the wrong theoretical yield, such as from an unbalanced equation or incorrect limiting reagent.
  • Forgetting to convert to the same unit when the calculator expects consistent units.

Last updated: August 13, 2026