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What percent is X of Y?
Enter a value and a total and get the percentage, for example 30 is 25% of 120. It is the quick way to turn a score, a share or a fraction into a percent.
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What is X% of Y?
X is what percent of Y?
Percentage change from A to B
Increase or decrease an amount by a percentage
X is P% of what number?
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Next step
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How it works
Read the answer
The result appears at the top of the list.
Check the formula
The formula is shown under each result.
How to find what percent one number is of another
To find what percent one number is of another, divide the part by the whole and multiply by 100. For example, 30 is 30 ÷ 120 × 100 = 25% of 120. In the calculator above, enter the value and the total in the section X is what percent of Y, and the percentage appears at the top of the results.
The formula
Percentage = part ÷ whole × 100. The whole is the total you compare against, so it cannot be zero. The result can be over 100% when the part is bigger than the whole: 150 is 150% of 100.
A worked example, step by step
You answered 45 questions correctly out of 60 and want your score as a percentage. Step 1: divide the part by the whole, 45 ÷ 60 = 0.75. Step 2: multiply by 100, which gives 75%. The same steps work for any share: 12 customers out of 150 is 12 ÷ 150 × 100 = 8%. If the result should be shown with fewer decimals, round only at the very end so the small errors do not add up.
Examples
| Part | Whole | Percentage |
|---|---|---|
| 30 | 120 | 25% |
| 45 | 60 | 75% |
| 7 | 50 | 14% |
| 250 | 1,000 | 25% |
| 18 | 24 | 75% |
Where you use it
- Test scores: 45 out of 60 is 75%.
- Market share, conversion rates and completion rates.
- Budget lines as a share of the total.
- Discounts: 7 off a 50 price is 14%.
Tips
- Always divide by the total, not by the part.
- To compare two changes, use the percentage change calculator instead.
- Round only at the end, so that small errors do not add up.
Private by design
The calculation runs in your browser as you type. The amounts you enter are never sent to a server, so you can use real prices, invoices and quotes.
Frequently asked questions
What percent is 30 of 120?
25%. 30 ÷ 120 = 0.25, and 0.25 × 100 = 25.
Can a percentage be more than 100%?
Yes, when the part is bigger than the whole. For example, 150 is 150% of 100.
How do I turn a fraction into a percent?
Divide the top by the bottom and multiply by 100. 3/8 is 0.375, which is 37.5%.
Is this converter free?
Yes. There is no sign-up and no limit, and it runs in your browser, so nothing you type is sent to a server.
Does it work on a phone?
Yes. It works in any modern mobile browser, and the result updates as you type.
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