A decrease and equal increase do not cancel
A 20% decrease followed by a 20% increase does not return the original number. Starting at 100 gives 80, then 96.
Math
Percentage change calculator
Calculate the percentage increase or decrease between two values.
Clear and dependable
How to use this calculator
Enter Starting value and New value. Calculate the percentage increase or decrease between two values.
Understanding the result
Calculate the percentage increase or decrease between two values.
Avoid these errors
Common mistakes
The starting value is the denominator
Percentage change is directional. Changing from 80 to 100 is +25%, while changing from 100 to 80 is −20%.