Percentage calculator
Enter your values: the result is computed live, with no data sent anywhere. Three modes: what is X% of Y, what percentage X represents of Y, and the percent change from one value to another.
Frequently asked questions
Is anything sent to a server?
No. The calculation runs entirely in your browser — nothing is ever sent to our servers.
How do I calculate X% of a number?
Use the first mode: enter the percentage (X) and the value (Y); the result (X% of Y) appears instantly.
How do I calculate a percentage change?
Use the third mode: enter the initial and final values; the increase or decrease in percent is shown automatically.
Is this tool really free?
Yes — completely free, with no sign-up, no ads and no artificial limits.
Are my files kept or shared?
No. All processing happens directly in your browser: your file is never uploaded to our servers, stored, or shared. It never leaves your device.