Free Percentage Calculator Online
Three modes: find X% of a number, find what percentage one number is of another, or calculate percentage change between two values.
About the Percentage Calculator
This free percentage calculator handles the three most common percentage problems encountered in everyday life. Whether you need to find a tip amount, calculate a discount, determine a test score, or understand a price increase, this tool covers all scenarios instantly in your browser.
How to Use the Percentage Calculator
Choose a Mode
Select one of three modes: find X% of Y, find what % X is of Y, or find percentage change.
Enter the Values
Type in the numbers in the input fields shown for that mode.
Click Calculate
The result appears immediately with a plain-English explanation.
Frequently Asked Questions
Use Mode 1 "X% of Y". Enter 15 in the percentage field and 200 in the number field. The result is 30.
Use Mode 2. Enter 50 as X and 200 as Y. The result is 25% (50 is 25% of 200).
Percentage change = ((New − Old) / |Old|) × 100. A positive result is an increase; negative is a decrease.
Yes, completely free. No signup, no download, no limits. All calculation happens in your browser.