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Percentage Calculator
Your numbers
Example: 25% of 80 is 20. Switch the mode above to find what percent one number is of another, or the percentage change between two values.
Behind the numbers
How percentages work
A percentage is a number out of 100. To find a percentage of a value, turn the percent into a fraction of 100 and multiply. To find what percent one number is of another, divide the part by the whole and multiply by 100. For a change, compare the difference to the starting value.
25% of 80 = (25 ÷ 100) × 80 = 20
20 as a percent of 80 = (20 ÷ 80) × 100 = 25%
From 50 to 75 = ((75 − 50) ÷ 50) × 100 = +50%
A few comparisons
Worked examples
| Calculation | Result |
|---|---|
| 25% of 80 | 20 |
| 10% of 250 | 25 |
| 20 is what percent of 80? | 25% |
| 30 is what percent of 120? | 25% |
| Percentage change from 50 to 75 | +50% |
| Percentage change from 80 to 60 | −25% |
Percentages, without the guesswork.
To find 10% of any number, move the decimal point one place to the left: 10% of 250 is 25, and 10% of 80 is 8.
A 50% increase followed by a 50% decrease does not return you to the start: 100 rises to 150, then falls to 75.
Percentage points are not the same as percent. Going from 20% to 25% is a 5-point rise, but a 25% increase.
Round only at the end of a calculation. Rounding the percent in the middle can shift the final answer.
Good to know
Your percentage questions, answered.
How do I calculate a percentage of a number?
Divide the percent by 100, then multiply by the number. For example, 25% of 80 is (25 ÷ 100) × 80 = 20.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 20 is (20 ÷ 80) × 100 = 25% of 80.
What is the difference between percentage change and percentage points?
Percentage change is relative to the starting value, while percentage points are the plain difference between two percents. Going from 20% to 25% is a 5 percentage-point rise, but a 25% increase.
Can a percentage be more than 100%?
Yes. A percentage over 100% just means the part is larger than the whole. For example, 150% of 80 is 120.