Work out X% of a number, what percent one number is of another, and percentage increase or decrease.
Enter both numbers to see the answer.
NinjaFunction's Percentage Calculator answers the three most common percent questions: what is X% of Y, X is what percent of Y, and what is the percentage change from one number to another. Enter two numbers and read the answer with a short sentence that explains it. It runs in your browser with no sign-up.
| Question | Formula | Example |
|---|---|---|
| X% of Y | Y × X ÷ 100 | 15% of 300 = 45 |
| X is what % of Y | X ÷ Y × 100 | 25 of 200 = 12.5% |
| Percent change | (New − Old) ÷ Old × 100 | 50 to 75 = +50% |
| Question | Calculation | Answer |
|---|---|---|
| What is 18% of 2,500? | 2,500 × 18 ÷ 100 | 450 |
| 45 is what percent of 60? | 45 ÷ 60 × 100 | 75% |
| Price rose from 80 to 100. By how much? | (100 − 80) ÷ 80 × 100 | +25% |
| Marks fell from 90 to 72. By how much? | (72 − 90) ÷ 90 × 100 | −20% |
A price that rises by 50% and then falls by 50% does not return to where it started. Start at 100: a 50% rise gives 150, and a 50% fall from 150 gives 75. To undo a 25% rise you need a 20% fall, because the second percentage is taken from a larger number. Use the % change mode to check any pair of values.
If an interest rate goes from 6% to 8%, it has gone up by 2 percentage points, but by 33.3 percent (2 ÷ 6). News and reports often mix these up. This calculator's % change mode gives the relative change, so 6 to 8 shows +33.33%.
Multiply the number by the percentage and divide by 100. For example, 15% of 300 is 300 × 15 ÷ 100 = 45.
Divide the first number by the second and multiply by 100. 25 out of 200 is 25 ÷ 200 × 100 = 12.5%.
Take the new value minus the old value, divide by the old value and multiply by 100. A result below zero is a decrease.
A change from zero cannot be shown as a percentage, because you would divide by zero. The tool shows no answer in that case.