Percentage Calculator
Calculate percentages, percentage changes, what percent X is of Y, and more. Covers every common percentage operation in one tool.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Percentage Calculator work?
The tool applies standard percentage formulas depending on the mode: "X% of Y" multiplies Y by X/100, "X is what % of Y" divides X by Y and multiplies by 100, and "% change" computes (new - old) / old * 100. Each mode updates results instantly as you type using debounced input handling.
How do I calculate what percentage one number is of another?
Use the "X is what % of Y" mode. Enter the part and the whole, and the calculator instantly shows the percentage. For example, 25 is 50% of 50.
How do I calculate a percentage increase or decrease?
Use the "% change" mode. Enter the original value and the new value, and the tool shows the percentage change with a clear increase or decrease label.
Can I calculate a tip or discount with this?
Yes, though we also have dedicated Tip Calculator and Discount Calculator tools for those specific use cases with extra features like bill splitting and price comparison.