Percentage Calculator
Calculate percentages, increases, decreases
How to use
- Choose the type of percentage problem you're solving.
- Enter your numbers.
- The answer is calculated instantly.
Why use this tool
- Common calculations: Percent of a number, what percent one number is of another, and percentage increase or decrease.
- Instant: Results update as you type — no formulas to remember.
- 100% private: Everything runs in your browser. Your data is never uploaded to a server, so it's safe for confidential content.
Frequently asked questions
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. The tool does this for you — just enter the two numbers.
How do I calculate a percentage increase?
Subtract the old value from the new, divide by the old, and multiply by 100. The tool handles increases and decreases automatically.
Is it private?
Yes. All math runs in your browser.
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