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Everyday Math
Percentage Calculator
Work out what X% of a number is, what percent one number is of another, or a percentage increase or decrease — with the formula shown using your numbers, so you can check every answer. Results are plain arithmetic: plain numbers or percentages, with no currency assumed.
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Result
Percentage (X)
Number (Y)
Difference (To − From)
Arithmetic only — check important figures before acting. Read the full disclaimer.
How it works
- Choose what you want to work out: a percentage of a number, what percentage one number is of another, or a percentage increase or decrease.
- Enter the two numbers. Negative numbers are allowed, and a percentage can be more than 100. The formula preview updates as you switch modes, and your numbers stay in place when you switch.
- You see the answer with the formula and your numbers filled in, so you can check it. In percentage-change mode you also see the difference and whether it is an increase, a decrease, or no change.
Result = (X ÷ 100) × Y
Result % = (X ÷ Y) × 100
Change % = ((To − From) ÷ From) × 100. Percentage change from zero is undefined, so the starting number cannot be 0. In the second mode, the second number cannot be 0, because you cannot divide by zero.
Worked examples
Example 1: What is 15% of 2,000? (15 ÷ 100) × 2,000 = 300. The answer is 300.
Example 2: From 800 to 1,000: ((1,000 − 800) ÷ 800) × 100 = +25.00%, an increase, with a difference of +200.
Frequently asked questions
What is X% of a number?
Multiply the number by X and divide by 100. For example, 15% of 2,000 is 300. Choose the “X% of Y” mode, enter X and Y, and the formula with your numbers is shown with the answer.
How do I calculate percentage increase or decrease?
Subtract the starting number from the new number, divide by the starting number, and multiply by 100. For example, going from 800 to 1,000 is a +25.00% increase, with a difference of +200. The starting number cannot be 0, because percentage change from zero is undefined.
How do I work out what percent one number is of another?
Divide the first number by the second number and multiply by 100. For example, 450 is 25.00% of 1,800. Choose the “X is what % of Y?” mode. The second number cannot be 0, because you cannot divide by zero.
Can I see the formula with my numbers?
Yes. The formula preview under the fields updates as you type, and the result shows the same formula with your numbers filled in — for example, 15% of 2,000 = 300. The formula is generated from your inputs; it is never a typed example.
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Important — please read
Results are plain arithmetic only, for information. They are not financial, tax, or other professional advice. Check important figures before acting on them, especially for money decisions. This tool stores nothing, files nothing, and takes no payment. If a result looks wrong, please report it via Contact, with the inputs and the result shown.