Percent Yield Calculator
Percent yield from actual and theoretical product mass.
Enter your values
Enter the actual yield in g.
Enter the theoretical yield in g.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Percent yield
- 78.1%
- Actual yield
- 8.2 g
- Theoretical yield
- 10.5 g
Quick answer
Percent yield = (actual yield / theoretical yield) x 100%.
%yield = actual/theoretical x 100
At a glance
| What it does | Percent yield from actual and theoretical product mass. |
|---|---|
| Category | Science |
| Inputs needed | Actual yield, Theoretical yield |
| Main output | Percent yield |
| Formula | %yield = actual/theoretical x 100 |
| Cost | Free — no sign-up, no download |
How to use the Percent Yield Calculator
- 1Enter the actual mass of product recovered from the reaction.
- 2Enter the theoretical yield calculated from stoichiometry.
- 3Read the percent yield achieved.
Inputs explained
- Actual yield(g)
- Enter the actual yield in g.
- Theoretical yield(g)
- Enter the theoretical yield in g.
Worked example
Using the values the calculator loads with:
Inputs
- Actual yield8.2 g
- Theoretical yield10.5 g
Results
- Percent yield78.1%
- Actual yield8.2 g
- Theoretical yield10.5 g
Frequently asked questions
Why is percent yield rarely 100%?
Side reactions, incomplete reactions and losses during purification all reduce actual yield below theoretical.
Can percent yield exceed 100%?
Only due to impurities or leftover solvent in the product — it indicates a measurement or purity problem.
What do I need to enter into the Percent Yield Calculator?
Just 2 values: actual yield, theoretical yield. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Percent Yield Calculator work out the answer?
Percent yield = (actual yield / theoretical yield) x 100%. It applies the formula %yield = actual/theoretical x 100 and shows the working so you can check each step by hand.
Is the Percent Yield Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.