Percentage Calculator
Quickly calculate percentages, increases and decreases.
What is X% of Y?
X is what percent of Y?
Percentage change
Add or subtract a percentage
How to calculate percentages
Use the calculators above to find a percentage of a number, determine what percentage one number is of another, calculate percentage change, or increase and decrease values by a percentage.
Example
To find 20% of 150, multiply 150 by 0.20. The result is 30.
Percentage change
Percentage change compares a new value with an original value. Moving from 100 to 125 is a 25% increase, while moving from 100 to 75 is a 25% decrease.
Practical example
Choose the panel that matches your question: a percentage of a value is different from the percentage change between two values.
For 15% of 240, enter 15 and 240 to get 36. To increase 240 by 15%, add that 36 to the original value: the result is 276.
Frequently asked questions
Why does a result show a dash?
Required fields may be empty or invalid. The part-to-total and change modes also cannot divide by a zero starting total.
Does a 25% increase followed by a 25% decrease cancel out?
No. Starting at 100, the increase gives 125 and the decrease gives 93.75, because the second percentage uses the new value.
Why do repeating decimals stop after a few digits?
The result displays up to six decimal places. A displayed value is rounded, so keep extra precision elsewhere if later calculations need it.