Percentage Calculator
Calculate percentages, find what percent one number is of another.
How It Works
Choose a calculation type: "What is X% of Y?" gives you the value of a percentage of a number (e.g., 15% of 200 = 30). "X is what % of Y?" finds the percentage (e.g., 30 is 15% of 200). "Percent change" computes the percentage increase or decrease from an original value to a new value. Enter the two numbers and click Calculate. All math is done in your browser—no data is sent to a server.
Useful for discounts, tips, grades, growth rates, and any quick percentage math. No account needed.
Frequently Asked Questions
Select "What is X% of Y?", enter the percentage (X) and the value (Y), then click Calculate. The result is (X/100) × Y.
Select "X is what % of Y?", enter X and Y, then click Calculate. The result is (X/Y) × 100.
Yes. The tool is free and runs entirely in your browser with no sign-up or limits.