About the Percentage Calculator
Percentages come up constantly — a discount at the shop, a tip at a restaurant, VAT on an invoice, or how much a price went up since last year. But the mental arithmetic trips most people up. This calculator handles the common percentage questions for you, clearly and instantly.
Work out what percent one number is of another, find a percentage of a value, or calculate the percentage increase or decrease between two numbers. Everything is computed live in your browser.
How to use it
- 1Choose the type of calculation you need.
- 2To find a percentage of a number, enter the percentage and the value.
- 3To find what percent one number is of another, enter both numbers.
- 4To find a change, enter the original and new values for the increase or decrease.
- 5Read the result instantly — no need to press calculate.
Common uses
- →Working out a discount or sale price in a shop.
- →Calculating a tip or splitting a bill by percentage.
- →Adding or removing VAT or sales tax from a price.
- →Measuring how much a value grew or shrank over time.
- →Checking a test score or completion percentage.
Tips & good to know
- A percentage increase and the equal-sized decrease don't cancel out — going up 50% then down 50% leaves you lower than you started.
- To remove a tax that was added, divide by 1 plus the rate, don't just subtract the percentage.
- Percentages over 100% are perfectly valid — they just mean more than the whole.
Frequently asked questions
- What calculations can it do?
- Finding a percentage of a number, what percent one number is of another, and the percentage increase or decrease between two values.
- Does it handle percentage change?
- Yes. Enter an original and a new value and it shows the increase or decrease as a percentage.
- Is my data uploaded?
- No. All calculations run locally in your browser.