Percentage Calculator

Calculate percentages with five different modes — instantly in your browser.

100% Browser-Based

Files Never Leave Your Device

No Server Uploads

Zero Data Collection

How It Works

Choose from five calculation modes: What is X% of Y, X is what % of Y, % change, add %, or subtract %.

Type in the numbers for your calculation.

See the result instantly with a clear explanation of the formula.

Copy the result to your clipboard with one click.

Covers the most common percentage calculations in one tool.

Results update in real-time as you type — no button needed.

Quickly copy results for use in other applications.

All calculations happen in your browser — no data sent anywhere.

How do I calculate a percentage of a number?

Select "What is X% of Y?" mode, enter the percentage and the number. For example, 15% of 200 = 30.

How do I calculate percentage change?

Select "% Change" mode, enter the old value and new value. The tool shows the percentage increase or decrease.

Can I use decimals?

Yes, the calculator supports decimal inputs for precise calculations.