Percent Yield Calculator
Calculate reaction percent yield.
Percent Yield measurements
Enter your values, then calculate.
Result
How to calculate percent yield
Percent yield compares the actual amount of product obtained in a chemical reaction to the theoretical maximum predicted by stoichiometry — a measure of real-world reaction efficiency.
How the calculation works
Percent yield = (Actual yield ÷ Theoretical yield) × 100.
Example
12 g actual yield against a 15 g theoretical yield: (12÷15)×100 = 80%.
Frequently asked questions
How is Result calculated?
Result = 100 × [Actual yield] ÷ [Theoretical yield].
Is the Percent Yield Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Percent Yield Calculator
Percent yield = (Actual yield ÷ Theoretical yield) × 100.
Let's understand your percent yield result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Percent Yield
- Percent yield is almost always below 100% in practice due to incomplete reactions, side reactions, and product loss during purification.
- A percent yield above 100% typically indicates the actual product contains impurities or unreacted starting material, not a true excess of pure product.
Common Percent Yield Mistakes to Avoid
- Treating a percent yield above 100% as a genuinely successful result, when it almost always indicates measurement error or impure product rather than an actual yield exceeding the theoretical maximum.
When to Use This Calculator
Percent yield compares the actual amount of product obtained in a chemical reaction to the theoretical maximum predicted by stoichiometry — a measure of real-world reaction efficiency.