Percentage Calculator
Work out X percent of Y, what percentage one number is of another, or the percentage increase or decrease between two numbers.
Work out X percent of Y, what percentage one number is of another, or the percentage increase or decrease between two numbers.
Formula
X% of Y = (X / 100) x Y. Percentage change = ((new value - old value) / old value) x 100.
Example
20% of 150 = 30. 30 is 20% of 150. Going from 150 to 180 is a 20% increase.
How to use it
- Choose a mode: percent of a number, one number as a percent of another, or percentage change.
- Enter the two numbers.
- Press Calculate.
- Read the result and the working shown beneath it.
Frequently asked questions
What is the difference between percent and percentage points?
A rise from 20% to 25% is a 5 percentage point rise, but a 25% increase relative to the starting 20%. The calculator shows the relative change.
Can percentages be over 100%?
Yes. 150% of 80 is 120, and a value can grow by more than 100% of its starting point.
What happens if the old value is zero?
Percentage change from zero is undefined, so the calculator reports that instead of a number.