Percentage Difference Calculator
Find the percentage difference between any two numbers. Unlike percentage change, percentage difference treats both values equally and is used when neither value is considered the reference point. Enter your two numbers below for an instant result.
How It Works
Percentage difference is used when you want to compare two values symmetrically, without designating one as the "original" and the other as the "new" value. It is commonly used in science, statistics, and data analysis.
The Formula
% Difference = |V1 − V2| ÷ ((V1 + V2) ÷ 2) × 100
You find the absolute difference between the two values, divide it by their average, and multiply by 100. The result is always a positive number, regardless of which value is larger.
Percentage Difference vs Percentage Change
Percentage change uses a specific starting value as the reference point and can be positive or negative. Percentage difference is symmetric: it does not matter which value you call V1 or V2. Use percentage difference when comparing two measurements that are not sequential.
Worked Examples
Example 1: Values of 50 and 75
|50 − 75| ÷ ((50 + 75) ÷ 2) × 100 = 25 ÷ 62.5 × 100 = 40%
Example 2: Comparing 120 and 180
|120 − 180| ÷ ((120 + 180) ÷ 2) × 100 = 60 ÷ 150 × 100 = 40%
Example 3: Comparing readings of 98 and 102
|98 − 102| ÷ ((98 + 102) ÷ 2) × 100 = 4 ÷ 100 × 100 = 4%
Example 4: Values of 200 and 300
|200 − 300| ÷ ((200 + 300) ÷ 2) × 100 = 100 ÷ 250 × 100 = 40%
Example 5: Comparing 1,000 and 1,500
|1000 − 1500| ÷ ((1000 + 1500) ÷ 2) × 100 = 500 ÷ 1250 × 100 = 40%
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