Percentage difference calculator
Measure the gap between two values relative to their average.
Formula
Difference (%) = |a − b| / ((a + b) / 2) × 100
Percentage difference ≈ abs((80)-(100))÷(((80)+(100))÷2)×100
How to use
- Enter the first nonnegative value.
- Enter the second in the same units.
- Read the percentage difference.
Examples
- 20 and 30 differ by 40%.
- 80 and 100 differ by approximately 22.222222%.
Frequently asked questions
Does swapping the values change the answer?
No. The absolute difference and their average stay the same.
How does this differ from percentage change?
Change uses the original value as its base; difference uses the average.
Can both values be zero?
No. Their average would be zero, making the ratio undefined.
Sources
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