Percent Yield Calculator

Calculate percent yield for chemical reactions. Free online actual vs theoretical yield calculator.

The Percent Yield Calculator determines the efficiency of a chemical reaction by comparing actual yield to theoretical yield. Enter both values to find the percentage of the theoretical maximum that was actually obtained. This fundamental chemistry tool helps evaluate reaction efficiency and identify losses in experimental procedures.

Common use cases

  • Evaluating reaction efficiency
  • Quality control in manufacturing
  • Chemical synthesis optimization
  • Research and development
  • Academic lab experiments

How to use

  1. Enter the actual yield obtained
  2. Enter the theoretical yield calculated
  3. Use the same units for both
  4. Click calculate for percent yield
  5. Interpret the efficiency result

FAQ

How is percent yield calculated?

Percent Yield = (Actual Yield / Theoretical Yield) × 100%.

What is theoretical yield?

The maximum possible product calculated from stoichiometry, assuming 100% efficiency and no losses.

Why is actual yield less than theoretical?

Losses occur from side reactions, incomplete reactions, purification losses, and experimental errors.

Can percent yield exceed 100%?

No, if it appears to, there's likely impurities in the product or measurement error.