Free Percentage Calculator
Three common percentage calculations in one tool.
The Percentage Calculator handles three common cases in one place: finding a percent of a number, working out what percent one number is of another, and calculating percentage change. It covers most everyday percentage problems.
1) What is X% of Y?
2) X is what percent of Y?
3) Percentage change from X to Y
What is a Percentage Calculator?
A percentage calculator is a mathematical tool that helps you calculate percentages quickly and accurately. Percentages express a number as a fraction of 100, making it easier to understand proportions and ratios. This calculator performs three common calculations: finding X% of Y, determining what percent X is of Y, and calculating the percentage change from one value to another.
Percentage calculations are used in everyday life—from calculating discounts, tips, and tax to understanding statistics, interest rates, and test scores. Businesses use percentages to analyze growth, profit margins, and market share. Students use them for grading and understanding statistical data. Our calculator eliminates the need for manual calculations or calculator apps, providing instant results with just a few inputs.
Our percentage calculator runs entirely in your browser with no data collection. It handles all three common percentage calculations in one intuitive interface. You can work on multiple calculations simultaneously without resetting anything. The tool is perfect for quick financial calculations, academic work, or any situation where you need to work with percentages regularly.
How to use this Percentage Calculator
- For calculation 1: Enter the percentage and the number to find X% of Y.
- For calculation 2: Enter both values to find what percent X is of Y.
- For calculation 3: Enter the old and new values to see the percentage change.
- Results appear automatically as you type, with no need to click a button.
- Each calculation works independently, so you can perform multiple calculations at once.
FAQ
How do I calculate a percentage?
To find X% of Y: multiply Y by X and divide by 100. Example: 15% of 200 = 200 × 15 / 100 = 30.
How do I calculate percentage change?
Percentage change = ((new - old) / old) × 100. A positive result means increase, negative means decrease.
Is this percentage calculator free?
Yes, completely free with no limits.
Is my data uploaded when I calculate a percentage?
No. Every calculation happens in your browser and nothing is uploaded or stored.