Percentage Difference Calculator

Formula

|A−B| ÷ ((|A|+|B|)/2) × 100

Worked example

First value 100; Second value 120 — 18.1818181818

Quick answer

What does the Percentage Difference Calculator do?

Calculate the percent difference between two values using their average magnitude.

What is the Percentage Difference Calculator?

Calculate the percent difference between two values using their average magnitude. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula |A−B| ÷ ((|A|+|B|)/2) × 100. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

First value 100; Second value 120 18.1818181818

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.