Percentage Difference Calculator

Compare two non-negative values symmetrically using their average as the denominator.

Your inputs

Use consistent units and periods. Defaults are examples.

Check the assumptions below before relying on a result.

Percentage difference = absolute(first − second) ÷ ((first + second) ÷ 2) × 100. Neither value is treated as the starting point.

For 80 and 100, the absolute difference is 20 and their average is 90. Percentage difference is 22.22%, whichever value is entered first.

Measure an increase or decrease relative to a starting value.

Recover an original amount from the final amount and a known increase or decrease.

Show the absolute difference between rates alongside the relative percent change.