Percentage Calculator - Free Online Percent Calculator
Calculate percentages easily. Find what percent of a number is, percentage change, and what percentage one number is of another. Free online percentage calculator.
Enter values above to calculate.
What is Percentage Calculator?
Percentage Calculator is a free online tool with three modes: calculate what percent of a number is (e.g. 20% of 150), find the percentage change between two values, and determine what percentage one number is of another. All calculations are instant and happen in your browser.
How to Use Percentage Calculator
- Choose the calculation mode from the tabs
- Enter the required values
- The result appears instantly
- Click Reset to clear the inputs
Percentage Calculator Features
- Three calculation modes in one tool
- Percentage of a number (e.g. 15% of 200)
- Percentage change between two values
- What percentage X is of Y
- Instant results, no server required
Percentage Calculator FAQ
How do I calculate percentage change?
Percentage change = ((New − Old) / |Old|) × 100. A positive result means an increase; negative means a decrease.
What is 'X is what % of Y'?
This mode answers questions like 'what percentage is 30 of 120?' — the answer is 25%.
Can I use decimals?
Yes. All input fields accept decimal numbers for precise calculations.