Percentage Decrease Calculator
How much a value fell, as a percentage of where it started.
The formula
decrease % = (start - final) / start × 100
From 80 to 60: (80 - 60) / 80 × 100 = 25%. The result is shown as a signed change, so -25% means a 25% decrease, and a positive number means the value actually went up.
Common uses and one trap
Price drops, weight loss and traffic dips are all percentage decreases. The trap is percentage points versus percent: an interest rate falling from 5% to 4% is a drop of one percentage point but a 20% decrease. When the values are themselves percentages, say which one you mean.