Percentage Calculator
Calculate percentages, percentage change, and percentage of a number instantly.
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About This Tool
Solve common percentage problems in seconds: find what percent one number is of another, calculate a percentage of a value, or determine the percentage increase or decrease between two numbers. Covers the three most common percentage use cases with clear inputs and instant results. Runs entirely in your browser with no external dependencies.
How to Use
- Select the calculation mode: percentage of a number, what percent X is of Y, or percentage change.
- Enter the required values in the input fields.
- Click Calculate to see the result instantly, then Copy to clipboard if needed.
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Frequently Asked Questions
- What percentage calculations does this tool support?
- Three modes: (1) What is X% of Y — multiplies a number by a percentage. (2) X is what % of Y — finds the ratio as a percentage. (3) Percentage change from X to Y — calculates the increase or decrease between two values.
- How is percentage change calculated?
- Percentage change is calculated as ((new value − old value) / old value) × 100. A positive result means an increase, a negative result means a decrease.
- Is this tool free to use?
- Yes. This tool runs entirely in your browser with no account required. Your data never leaves your device.
- Can I use this for financial calculations?
- Yes. The calculations are mathematically precise and suitable for financial use cases like discounts, tips, tax rates, profit margins, and investment returns.
- Does this work on mobile?
- Yes. The tool is fully responsive and works on any device with a modern browser.