Percentage Calculator
Solve the three percentage questions in one place.
Input
This tool runs entirely in your browser. The data you paste or load is never uploaded.
Result
Enter your input, then run the tool.
About this tool
Answers “what is X% of Y”, “X is what percent of Y” and “X is Y% of what number”, showing the formula and steps. Results include a plain-language sentence you can paste into a report.
How to use it
- Choose the question you are asking.
- Enter the two known values.
- Press Calculate to see the answer and the working.
Frequently asked questions
How do I calculate a percentage increase?
Use the percentage change calculator: it divides the difference by the original value and expresses the result as a percentage.
Why is 20% off not the same as 20% more?
They use different bases. A 20% discount on 100 gives 80, and adding 20% to 80 gives 96, not 100.
Keep going
Related tools
Percentage Change Calculator
Measure increase or decrease between two values.
Discount Calculator
Find the sale price and the amount saved.
VAT Calculator
Add or extract VAT from a gross or net amount.
Profit Margin Calculator
Turn cost and price into margin and markup.
Unit Converter
Convert length, weight, volume, speed, area and data units.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine.