Percentage Calculator
Solve everyday percentage problems: find what a percentage of a number is, work out what percentage one number is of another, or calculate a percentage increase or decrease.
What is X% of Y?
20
10% of 200 is 20
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How to use percentage calculator
- 1Choose the type of calculation you need.
- 2Enter the numbers involved.
- 3See the result update instantly, with no submit button required.
About this tool
Percentages come up constantly in everyday life, from calculating a discount or tip to understanding a change in price or a statistic in the news. This calculator covers the most common percentage questions in one place.
Each mode uses a standard, well-known formula: for example, percentage change is calculated as ((new value − old value) ÷ old value) × 100. Results update instantly as you type.
Worked examples: 15% of 80 is 0.15 × 80 = 12. 30 out of 120 is 30 ÷ 120 × 100 = 25%. A price rising from 40 to 50 is a (50 − 40) ÷ 40 × 100 = 25% increase, while falling from 50 back to 40 is a 20% decrease — the same 10 difference is a different percentage because it's measured against a different starting value.
Frequently asked questions
Divide the first number by the second, then multiply by 100. The "X is what percentage of Y" mode does this for you automatically.
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