Percentage Decrease Calculator
Enter an original and a new value below to instantly get the percentage decrease.
Percent Decrease
25%
Change of -20 from 80 to 60
The Percentage Decrease Formula
Percentage decrease = (original − new) ÷ original × 100
Worked example
A price drops from $80 to $60.
(80 − 60) ÷ 80 × 100 = 20 ÷ 80 × 100
Percentage decrease = 25%
Frequently Asked Questions
What is the percentage decrease formula?
Percentage decrease = (original value − new value) ÷ original value × 100.
Why do some calculators show a negative sign?
Some tools return the raw percent change, which is negative when a value drops. This calculator reports the magnitude of the decrease directly.
Does percentage decrease always use the original value as the base?
Yes. The decrease is always measured relative to the starting value, not the ending value — that's why a 50% decrease followed by a 50% increase doesn't get you back to where you started.
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