💯 Percentage Calculator
Solve any percentage problem instantly with three dedicated calculators: find X% of a number, determine what percent one number is of another, or calculate the percentage increase or decrease between two values—completely free and running entirely in your browser with no uploads or login required.
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About
This percentage calculator covers the three most common percentage questions people search for every day. All calculations happen locally in your browser using JavaScript—nothing is ever sent to a server, so your numbers stay completely private. It works fully offline, making it reliable even without an internet connection.
How to use
- Choose the calculator panel that matches your question: 'X% of Y', 'X is what % of Y', or 'Percentage change from X to Y'.
- Enter your numbers in the input fields. Results update live as you type—no need to press a button.
- For percentage change, check the increase/decrease badge below the result to instantly see the direction of change.
- Click the Copy button next to any result to copy it to your clipboard in one click.
FAQ
- Is this percentage calculator free to use?
- Yes, it is completely free with no ads, no subscriptions, and no sign-up required. Just open the page and start calculating.
- Do you upload or store my numbers anywhere?
- No. All calculations run entirely in your browser. Nothing you type is ever sent to a server or stored anywhere outside your device.
- Does it work offline or without an internet connection?
- Yes. Once the page is loaded, it works fully offline. No network requests are made during calculations.
- How do I calculate the percentage increase between two numbers?
- Use the third panel 'Percentage increase / decrease from X to Y'. Enter the original value in 'From' and the new value in 'To'. The result shows the percentage change and an increase/decrease badge instantly.
- Can I find what percentage one number is of another?
- Yes. Use the second panel 'X is what percent of Y?'. Enter both numbers and the percentage ratio is calculated and displayed in real time.