Percent Yield Calculator
Compare actual product obtained with the theoretical yield in a chemical reaction. It is useful for study, lab preparation, engineering notes, or checking a calculation where consistent units matter.
How to use this calculator
Enter the original and comparison values requested by the tool. Decide first whether you need a percentage of a number, a percentage change, or the value represented by a percentage; these are different calculations.
Formula
Percent yield = actual yield Γ· theoretical yield Γ 100%.
Quick check
Where a rate, percentage, or time period is involved, confirm that it matches the period used by the formula. For technical or academic work, write down the units alongside the numbers. A mathematically correct calculation can still be misleading if the units are wrong.