Percentage Difference Calculator
Difference % = |A − B| ÷ ((A + B) ÷ 2) × 10020 ÷ 50 × 100 = 40%
Free online tool
Percentage Difference Calculator
Find the percentage difference when neither value is considered the original baseline.
Instant calculation
Calculate percentage difference
Compare two non-negative values without choosing a baseline.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter both values
Type the two non-negative values you want to compare.
- 02
Use their average
The calculator uses the average as a neutral reference value.
- 03
Read the difference
Calculate to see the percentage and absolute difference.
The formula
How this calculation works
Divide the absolute difference by the average of the two values, then multiply by 100.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
What is the difference between 40 and 60?
20 ÷ 50 × 100 = 40%40%What is the difference between 90 and 110?
20 ÷ 100 × 100 = 20%20%Common questions
Questions about this calculation
How is percentage difference calculated?
Divide the absolute difference between the values by their average, then multiply by 100.
When should I use percentage difference?
Use it when comparing two values and neither one is the original or reference value.
What is the percentage difference between 40 and 60?
The absolute difference is 20 and the average is 50, so the percentage difference is 40%.
Does the order of the two values matter?
No. The formula uses an absolute difference and the same average, so switching the values gives the same result.
What is the percentage difference between zero and zero?
Flux Calculator defines two identical zero values as a 0% difference.
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