About the Percentage Calculator
Solve the three most common percentage problems in one place. This tool is free, works in your browser and needs no sign-up.
How to use the Percentage Calculator
Choose the type of question, then enter X and Y.
Formula used
X% of Y = X ÷ 100 × Y. X is what % of Y = X ÷ Y × 100. Change = (Y − X) ÷ X × 100.
Example
20% of 150 is 30.
Frequently asked questions
Is the Percentage Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Percentage Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.