Percentage Calculator
Percentage of a number, what percent one number is of another, or percentage change.
Covers the three percentage calculations people actually need — finding a percentage of a number, working out what percent one number is of another, and calculating percentage increase or decrease between two values.
Frequently asked questions
How do I find what percentage one number is of another?
Use the "X is what percent of Y" mode — enter both numbers and the calculator returns the percentage directly.
How is percentage change calculated?
Percentage change is (new value − old value) ÷ old value × 100, and the calculator handles both increases and decreases.
Can I calculate a percentage of a number, like 15% of 200?
Yes — that's the calculator's default mode: enter the percentage and the number to get the result instantly.