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Percentage Calculator
Every everyday percentage sum: percent of, what percent, percentage change and more.
Percent of a number
What percent
Percentage change
Increase or decrease by a percent
Percentage difference
Change vs difference: percentage change compares a new value with an old one — (new − old) ÷ old — so the direction matters. Percentage difference compares two values with neither as the baseline — |a − b| ÷ their average. And a 20% rise followed by a 20% fall doesn’t get you back where you started: 100 → 120 → 96.
About the Percentage Calculator
The Percentage Calculator solves every everyday percentage problem in one place: X% of a number, what percent one number is of another, percentage increase or decrease between two values, adding or subtracting a percentage and the percentage difference. Answers update as you type — handy for homework, shopping, finance and work.
How to use the Percentage Calculator
- Find the calculator that matches your question.
- Type the numbers into the sentence.
- Read the answer, which updates instantly.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. 15% of 240 is 240 × 15 ÷ 100 = 36.
How do I calculate percentage change?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100 is a 25% increase.
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with an old one, so direction matters. Percentage difference compares two values against their average, with neither as the starting point.