Percentage Increase Calculator
Last updated: November 5, 2026
Calculate percentage increase or decrease, absolute change and change factor between two values.
Percentage change
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- Absolute change: —
- Change factor: —
- Direction: —
On this page
Quick summary: Calculate percentage increase or decrease, absolute change and change factor between two values.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Calculate percentage increase or decrease, absolute change and change factor between two values.
How to use it
Enter Original value; New value. Select Calculate to update the results.
How the calculation works
Percentage change is the difference between the new and original values divided by the absolute original value.
Worked example: starting scenario
| Original value | 80 |
|---|---|
| New value | 100 |
| Percentage change | 25% |
|---|---|
| Absolute change | 20 |
| Change factor | 1.25 |
| Direction | Increase |
Important limitations
An original value of zero has no defined percentage change.
Keep the starting value as the base
The relative change is (new − old) / old × 100. Moving from 80 to 100 is a 25% increase; moving back from 100 to 80 is a 20% decrease because the base changed. A zero starting value has no defined relative percentage change. The absolute difference can still be meaningful, and a change in percentage points is a different calculation.