Percentage Change
Measures relative increase or decrease from an original value.
% change = ((new − old) / old) × 100
Variables
- new
- new value
- old
- original value
Example
From 80 to 100: 25% increase
How to use this formula
Identify the known values, keep units consistent, substitute the values into the formula, and calculate carefully. Then check whether the result is reasonable for the original problem.