# Percentage Difference Calculator

> Measure the absolute difference between two values relative to their average magnitude.

Page: https://askcalculators.com/calculator/percentage-difference-calculator/
Definition: https://askcalculators.com/calculator/percentage-difference-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/percentage-difference-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/percentage-difference-calculator/?valueA=80&valueB=100

## Inputs
- valueA: First value; type=number; required; default=80
- valueB: Second value; type=number; required; default=100

## Outputs
- percentageDifference: Percentage difference; format=percent; primary
- absoluteDifference: Absolute difference; format=number
- averageMagnitude: Average magnitude; format=number

## Formula
percentage difference = |a − b| ÷ ((|a| + |b|) ÷ 2) × 100%

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.