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Science Calculators

Percent Yield Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

Percent yield

80.00%

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Percent Yield Calculator

The Percent Yield Calculator works out your percent yield in an instant. Enter actual yield and theoretical yield and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the actual yield.
  2. Enter the theoretical yield.
  3. Read off your percent yield — the calculator updates automatically, with no button to press.

Formula

The Percent Yield Calculator uses the formula:

Percent yield = Actual yield ÷ Theoretical yield × 100

Worked example

For example, with actual yield of 8 and theoretical yield of 10, the percent yield is 80.00%.

Inputs used
Actual yield 8
Theoretical yield 10
Results
Percent yield 80.00%

Results are estimates for educational use, not professional advice.

Frequently asked questions

Divide the actual yield by the theoretical yield and multiply by 100. Getting 8 g from a possible 10 g is an 80% yield.

It is the maximum product a reaction could make based on the limiting reactant, assuming a perfect, complete reaction.

Side reactions, incomplete reactions and losses during transfer and purification all reduce the actual yield.

It should not. A value above 100% usually means impurities or leftover solvent inflated the measured product mass.

Enter the actual yield. Enter the theoretical yield. Read off your percent yield — the calculator updates automatically, with no button to press.

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