Percentage Calculator
This free percentage calculator handles the three questions people ask most: what is a given percent of a number, what percentage one number is of another, and how much a value has gone up or down in percent. Type your figures and the answer updates instantly, with no page reload and no math by hand.
%
Result
30
How it works
A percentage is a fraction out of 100. The core formulas are:
- X% of Y = (X ÷ 100) × Y
- X is what percent of Y = (X ÷ Y) × 100
- Percentage change = ((New − Old) ÷ Old) × 100
Example: 20% of 150 = (20 ÷ 100) × 150 = 30. A change from 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25% increase.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100, then multiply by the number. For 15% of 200, calculate 0.15 × 200 = 30.
How do I find what percent one number is of another?
Divide the first number by the second, then multiply by 100. 45 out of 60 is (45 ÷ 60) × 100 = 75%.
How is percentage increase calculated?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A rise from 50 to 65 is a 30% increase.
Is this percentage calculator free?
Yes. Every calculator on this site is free to use with no sign up and no limits.