Percentage Difference Calculator
Enter two values to find the percentage difference between them, relative to their average.
Percentage Difference Calculator
Calculate the percentage difference between two numbers, using their average as the base (unlike percentage change, which uses the original value as the base).
Percentage difference is a symmetric comparison: it divides the absolute difference between two values by their average, then converts to a percentage. This differs from percentage change, which is directional and uses only the original value as the base.
Example
- With the default values shown above, this calculator returns: Absolute Difference ≈ 20.00; Average of the Two Values ≈ 70.00; Percentage Difference ≈ 28.57.
Frequently Asked Questions
How is this different from percentage change?
Percentage change is relative to a starting value and can be different depending on which number you start from. Percentage difference is symmetric — it uses the average of both numbers as the base, so it gives the same answer regardless of order.
When should I use percentage difference instead of percentage change?
Use percentage difference when comparing two independent measurements where neither is clearly the 'original' (e.g. comparing two lab readings). Use percentage change when one value is clearly the starting point and the other is the result over time.