About Percentager
Percentager is a free website for percentage calculations, online since 2023 and available in 32 languages. Everything on the site is free, works on phones and computers, and does not need an account.
What you can calculate
- Find a percentage of a number, or what percent one number is of another
- Work out a percentage increase or decrease, and the percentage difference between two numbers
- Add or subtract a percentage, or find the original value before a percentage was added or taken off
- 100 dedicated calculators, one for each percentage from 1% to 100%, with worked examples, mental-math shortcuts and reference tables
How the calculations work
Every calculator uses the standard percentage formulas taught in school. These are the ones used most often:
| X% of Y | Y × X ÷ 100 |
|---|---|
| X as a percentage of Y | X ÷ Y × 100 |
| Percentage change from A to B | (B − A) ÷ A × 100 |
| Percentage difference between A and B | |A − B| ÷ ((A + B) ÷ 2) × 100 |
| Original value before a P% increase | Y ÷ (1 + P ÷ 100) |
There is no Calculate button: answers update instantly as you type. When a question involves a percentage, you can drag a slider to try other values, and a chart is one tap away if you want to see the result visually.
Results are rounded to two decimal places, and each calculator shows the steps it used, so you can check the working yourself.
The calculations run in your browser. The numbers you type are not sent to our servers or stored.
Accuracy and corrections
Because every result comes with its working, mistakes are easy to spot. If a result, translation or explanation looks wrong to you, please email [email protected]. Reports like this are how we find and fix mistakes.
Who runs Percentager
Percentager was built by an IT engineer, who continues to develop and maintain it.
How the site is funded
Percentager is free to use and is paid for by the advertising shown on its pages. Advertisers have no influence on the calculators or their results. Privacy policy
Available in 32 languages
Percentager is written for people who prefer to work in their own language. Every language has the full set of calculators:
Contact
Questions, ideas for new calculators and problem reports are welcome at:
[email protected]