Method
Percentage change compares a new value with an original value, while also showing signed and absolute differences.
Numbers / browser tool
Percentage Change Calculator
Calculate percentage increase, decrease, and absolute difference.
Handles zero originals and negative values with explicit labels.
Your inputs stay on your device
Calculate percentage change
live resultPercentage change
increase
Absolute difference
Signed difference
For a zero original value, percentage change is undefined; the absolute difference is shown instead. Negative values use the absolute original as the denominator.
Context & Reference
How it works
Calculators are most useful when their assumptions are clear. Review these details to better understand the logic behind the results.
How to use it
Enter the original and new values, then review whether the change is an increase or decrease.
Understand the result
Signed difference preserves direction; absolute difference ignores direction; percentage change uses the original as reference.
Example
Moving from 80 to 100 is a 25% increase and a difference of 20.
Notes
A zero original value cannot produce a conventional percentage change, so the tool explains that case explicitly.
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