Percentage Change Calculator

Measure an increase or decrease relative to a starting value.

Your inputs

Use consistent units and periods. Defaults are examples.

Check the assumptions below before relying on a result.

Percentage change = (new value − original value) ÷ original value × 100. Multiplier = new value ÷ original value.

A move from 100 to 120 is a 20% increase. Returning from 120 to 100 is a 16.67% decrease, because the comparison base changes.

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

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.