Percentage Calculator
Calculate a percentage of a number, find what percentage one value is of another, measure percentage change, or increase and decrease a value by a percentage.
Percentage Formulas
Most percentage calculations use one of four simple formulas.
(P ÷ 100) × N
(A ÷ B) × 100
((New − Original) ÷ Original) × 100
Original × (1 ± P ÷ 100)
How to Use the Percentage Calculator
Choose the calculation mode that matches the question you want to answer, enter both values, and the result updates automatically.
- Select % of Number, What %, % Change, or Adjust %.
- Enter the requested numbers in the two fields.
- Read the calculated result and formula beside or below the inputs.
- On a phone or tablet, use Open Fullscreen for a larger calculator interface.
What Does Percent Mean?
A percentage represents a quantity out of 100. The symbol % literally means “per hundred.”
For example, 25% is the same as 25 out of 100, the fraction 25/100, or the decimal 0.25.
Percentages are commonly used for discounts, taxes, tips, interest rates, grades, statistics, price changes, and comparisons between values.
Percentage Examples
15 ÷ 100 × 200 = 30.
30 ÷ 200 × 100 = 15%.
The increase is 25%.
Percentage Calculator FAQ
How do you calculate a percentage of a number?
Divide the percentage by 100, then multiply by the number. For example, 15% of 200 is 0.15 × 200 = 30.
How do you calculate what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 is 15% of 200 because 30 ÷ 200 × 100 = 15.
How do you calculate percentage change?
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100.
Can percentage change be calculated from zero?
Standard percentage change from an original value of zero is undefined because the calculation requires division by the original value.
Can a percentage be greater than 100%?
Yes. A percentage above 100% means the amount is greater than the reference value. For example, 150 is 150% of 100.