Utility tool
Percentage Calculator
Work out what percent one number is of another, a percentage of a number, or the percent change.
Free｜No sign-up｜Files stay on your device
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Support us／Ko-fiAbout Percentage Calculator
The three everyday percentage questions — “A is what % of B?”, “What is A% of B?” and “By what % did A change to B?” — in one tool, with the formula shown.
Handy for growth rates, test scores and budget shares.
Great for
- ・Sales and revenue growth
- ・Test score percentages
- ・Budget and spending shares
How to use
- 01Fill in each field.
- 02Results are calculated instantly below.
Why use it
Private by design
Everything runs locally in your browser. Nothing passes through a server.
Instant
No software to download and no account to create.
Works everywhere
Desktop, phone, or tablet — any modern browser.
Free forever
No watermarks and no usage limits.
Frequently asked questions
How do I calculate percentage change?
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Percent change = (new − old) ÷ old × 100%. For example, going from 80 to 100 is a 25% increase.
Is this tool free? Do I need an account?
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It's completely free. There's no sign-up, no login and no usage limit.
Are my files and data safe?
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Everything is processed inside your browser. Your files are never uploaded to our servers and disappear when you close the page.
Does it work on my phone?
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Yes. The page is fully responsive and works in current versions of Chrome, Safari and Edge on iPhone, Android and tablets.
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