Percent Yield Calculator
Actual vs theoretical reaction yield.
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
- 82.69%
- Mass lost
- 1.8 g
- Percent lost
- 17.31%
- Quality
- Good
Quick answer
Percent yield is actual yield divided by theoretical yield times 100; above 100% signals impurity or error.
% yield = Actual ÷ Theoretical × 100
At a glance
| What it does | Actual vs theoretical reaction yield. |
|---|---|
| Category | Science |
| Inputs needed | Actual yield, Theoretical yield |
| Main output | Percent yield |
| Formula | % yield = Actual ÷ Theoretical × 100 |
| Cost | Free — no sign-up, no download |
How to use the Percent Yield Calculator
- 1Weigh the purified product you obtained.
- 2Calculate theoretical yield from stoichiometry.
- 3Enter both masses in the same unit.
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 yield8.6 g
- Theoretical yield10.4 g
Results
- Percent yield82.69%
- Mass lost1.8 g
- Percent lost17.31%
- QualityGood
Frequently asked questions
Can yield exceed 100%?
Only if the product is wet or contaminated — dry and reweigh.
What is a normal yield?
70–90% for a well-run synthesis; multi-step routes are much lower.
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 is actual yield divided by theoretical yield times 100; above 100% signals impurity or error. It applies the formula % yield = Actual ÷ Theoretical × 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.