Math calculators
Percentage Calculator
Solve percent-of, reverse percent, and percent change problems instantly. Processing stays on your device.
Result
30
How to use
- Pick a calculation mode.
- Enter the two values for that mode.
- Read the result — copy it if you need it elsewhere.
Features
- What is X% of Y
- X is what percent of Y
- Percent change, increase by %, and decrease by %
Privacy & how it works
This calculator runs entirely in your browser with JavaScript. Your inputs are not uploaded to ToolsWeb servers for this tool. Privacy Policy · Disclaimer.
FAQ
How do I calculate percent change?expand_more
Choose Percent change, enter the starting value and the new value. Result = ((new − start) ÷ |start|) × 100.
Can I use decimals?expand_more
Yes. Enter decimals such as 12.5 for percentages or amounts.
Is this calculator free?expand_more
Yes. No signup required.
Are my numbers uploaded?expand_more
No. Calculations run in your browser. Inputs are not sent to ToolsWeb servers for this tool.
Is this professional advice?expand_more
No. Results are estimates for general information. See our Disclaimer for health, finance, and related tools.