Calculate what percentage one number is of another. Enter the part and the total to turn your two values into a percentage.
Divide the part by the total, then multiply by 100 to get the percentage.
| Question | Answer |
|---|---|
| 30 out of 150 | 20% |
| 18 out of 24 | 75% |
| 12.5 out of 50 | 25% |
Try these values in the calculator above.
To find what percentage one number is of another, divide the part by the total and multiply by 100. For 30 out of 150, the ratio is 0.2, or 20%.
The order matters. 30 is 20% of 150, while 150 is 500% of 30. Put the amount you are measuring in Part value and the amount you are comparing it with in Total value.
The app calls this free function “% of a part value.” It finds the percentage itself. The percentage calculator on the homepage does the opposite task: it finds an amount from a known percentage.
18 correct answers out of 24 is 18 ÷ 24 × 100 = 75%. For a test with differently weighted questions, use points earned and maximum possible points instead of the number of answers.
If a category uses 240 from a total budget of 1,200, it represents 20%. Use amounts from the same time period and in the same currency.
Reaching 36 of a target of 60 gives 60% progress. Reaching 75 against the same target gives 125%. A result above 100% means the measured amount is larger than the reference total.
Do not average percentages from groups of different sizes unless each group should have equal weight. Someone scoring 8 out of 10 has 80%; someone scoring 45 out of 90 has 50%. Together, they scored 53 out of 100, or 53%. The simple average of 80% and 50% would be 65%, which answers a different question.
For a combined share, add the parts and add the corresponding totals, then calculate the percentage from those sums. To find an unknown total from a share instead, use find the whole from a percentage.
To calculate a percentage increase or decrease, subtract the starting amount from the new amount and compare that difference with the starting amount. Use the percentage change calculator for this task. A part-to-total share compares one amount directly with a reference total.
A total of zero cannot be used as a denominator. A part of zero with a nonzero total gives 0%. When the part equals the total, the result is 100%.
Check a score, a budget share or progress toward a target on your phone. The app’s “% of a part value” mode is free to use with ads.
Yes. The result will be greater than 100%. For example, 150 compared with a reference total of 100 is 150%. The total cannot be zero.
Yes. In the app, choose the free “% of a part value” mode. It shows ads; Premium gives you the other calculators without ads.
Ordinary results use up to eight decimal places. Very small or large results use scientific notation. The ≈ symbol marks display rounding, and the formula preserves the significant digits of your input values.
Divide the first number by the second and multiply by 100. For example, 7 out of 20 is 7 ÷ 20 × 100 = 35%.
A percentage is a ratio expressed per hundred. The part-to-total ratio 3 to 4 is 3 ÷ 4 = 0.75, or 75%. A part-to-part ratio needs a different total: 3 red items and 4 blue items make 7 items, so the red share is 3 out of 7.
Yes, a numerator divided by a nonzero denominator has the same mathematical structure. For example, 3 divided by 8 times 100 is 37.5%. The app also has a dedicated fraction-to-percent feature with Premium.
