📈 Percent Yield Calculator
Enter actual and theoretical yield to get percent yield — or solve for the actual or theoretical value.
Percent yield
82 %
Percent yield = (actual yield ÷ theoretical yield) × 100. 🔒 Computed in your browser.
How the percent yield calculator works
Percent yield = (actual yield ÷ theoretical yield) × 100. Enter any two of the three and the tool solves for the third; actual and theoretical must be in the same units.
Pairs with the stoichiometry calculator (which gives theoretical yield): divide your measured product by the theoretical maximum to see how efficient the reaction was.
Frequently asked questions
How do you calculate percent yield?
Divide the actual yield by the theoretical yield and multiply by 100. If you made 8.2 g and the theoretical maximum was 10 g, percent yield = 82%.
What is theoretical yield?
The maximum product the reaction could produce, from the limiting reagent, assuming no losses. Find it with the stoichiometry calculator.
Can percent yield exceed 100%?
Not really — a value above 100% usually means the product is impure or still wet (contains solvent or unreacted material), inflating the measured mass.
Why is actual yield less than theoretical?
Side reactions, incomplete reactions, and losses during transfer and purification all reduce the amount you actually recover.
What units should I use?
Any, as long as actual and theoretical are the same unit (both grams, or both moles).