How This Tool Works
The Percentage Change Calculator compares an original value with a new value and reports the relative change as a percentage. Enter the starting value in Original Value and the ending value in New Value; the calculator applies ((New - Original) / Original) x 100.
A positive result means the value increased, while a negative result means it decreased. For example, changing from 80 to 100 is ((100 - 80) / 80) x 100 = +25%.
- Input: Original value and new value.
- Output: Percentage increase or decrease.
- Important: Percentage change is undefined when the original value is zero.