Percentage difference
Percentage difference: use first value, second value. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
Difference = |a−b| / [(a+b)/2] × 100
Variables & units
- First value
- Numeric value · minimum 0, maximum 1000000000000
- Second value
- Numeric value · minimum 0, maximum 1000000000000
Worked example
80 and 100 differ by approximately 22.2222% of their average.
Assumptions
Symmetric comparison of nonnegative values; both zero is defined here as zero difference. This is not directional percentage change.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
Calculated on your device. Your latest 100 calculations stay in this browser.