Percentage
Calculator.
Pick a mode, fill the inputs, and the answer updates live. Switch between five common percentage questions — percent of a value, finding a percent, reverse, difference, and change — all client-side, nothing leaves your browser.
Frequently asked questions
What does Percentage Calculator do?
Solve every common percentage problem — of, change, off. The whole thing runs in your browser tab, so it is ready the moment the page finishes loading.
Is Percentage Calculator free to use?
Yes. Percentage Calculator is completely free on ToolMunch — no trial, no premium tier holding back the main feature, and no daily or hourly cap on how many times you can use it.
Do I need to create an account or sign up?
No. There is no account, no email address, and no login. Open Percentage Calculator, do the job, and take the result — nothing is gated behind a signup form.
Are the numbers I enter sent to a server?
No. Percentage Calculator runs entirely inside your browser tab, so what you type never leaves your own device. Nothing is uploaded, which means there is no copy of it on a server to worry about.
Does Percentage Calculator work on Mac, Windows, and phones?
Yes. Percentage Calculator runs in any modern web browser on Windows, macOS, Linux, Chromebook, Android, and iOS. There is nothing to download or install.
Can I use it as many times as I want?
Yes. There is no queue, no per-hour quota, and no counter that runs out — run Percentage Calculator as often as the work needs.