Percentage Change Calculator
Measure the percent increase or decrease from a baseline to a new value.
How to use
- Enter the original or baseline value first.
- Enter the new value second and calculate.
Capabilities and scope
The first value is treated as the baseline, so the result preserves the direction of change.
How it works
It uses (new − baseline) / baseline × 100.
Example
Changing from 100 to 120 gives +20%; changing to 80 gives −20%.
Useful for
- Compare sales, price, or traffic with a prior period
- Measure directional growth or decline in a metric
Before you use it
- The usual percentage-change formula is undefined when the baseline is zero.
Frequently asked questions
What if neither value should be the baseline?
Use percentage difference when you need a symmetric comparison with no baseline direction.