HOW IT IS CALCULATED
Measure how much a value decreased
Compare an original value with a lower new value and calculate the decrease relative to the original.
Instant resultClear formulaRuns locally
01Values
02(original − new) ÷ original × 100
03Result
100 → 80 = 20% decrease
A 20% decrease does not undo a 20% increase
The reference value changes after the first percentage operation, so equal percentage changes in opposite directions are not symmetric.
02
In short
What logic does the calculator use?
(original − new) ÷ original × 100
Example?
100 → 80 = 20% decrease