Percentage Change Calculator
Calculate percentage increase or decrease between two numbers instantly.
Calculate the percent difference between two values.
20%
20
Increase
About the percentage change calculator
How this calculator works
Percentage change compares how far a new value has moved relative to the starting value. That makes it more useful than just looking at the raw difference on its own.
This page is focused on before-and-after comparisons, so it keeps the inputs and explanation simpler than the broader percentage calculator.
Where it is useful
The tool is useful for revenue changes, traffic trends, score changes, pricing shifts, and KPI snapshots.
A dedicated page also makes it easier to send people directly to the increase/decrease workflow when that is the exact task they need.
- Measure price increases and discount differences.
- Compare performance metrics across weeks or months.
- Check growth or decline for traffic, sales, and production counts.
Example calculations
3 examples100 to 120
20% increase
250 to 200
20% decrease
-100 to -80
20% increase
negative baseline
Common uses
3 ideas- Measure price increases and discount differences.
- Compare performance metrics across weeks or months.
- Check growth or decline for traffic, sales, and production counts.
FAQ
3 answersWhat formula is used for percentage change?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
Why does the old value need to be non-zero?
The old or original value cannot be zero because percentage change divides by that starting value.
Does the calculator show the absolute difference too?
Yes. The result card shows the raw difference as well as the percentage increase, decrease, or no-change result.