Percentage Decrease Calculator
The Percentage Decrease Calculator finds how much a value fell, in percent, between an original and a new number — such as a discount, a drop in price or a loss of weight. If the new value is higher, it reports the percentage increase instead.
What this means
Percentage decrease measures the drop relative to the starting value. A fall from 80 to 60 is a 25% decrease, because 20 is 25% of the original 80.
How we calculate it
Formula
Decrease % = (Original − New) ÷ |Original| × 100.Worked example
A product drops from $80 to $60:
- 1Decrease = 80 − 60 = 20
- 220 ÷ 80 = 0.25
- 30.25 × 100 = 25% decrease
Important assumptions
- Both values must be positive for a meaningful percent decrease.
Frequently asked questions
How do I calculate a 20% discount?
Multiply the original price by 0.80. An $80 item becomes $64 after a 20% discount.
What if the new value is higher?
This calculator reports it as a percentage increase instead of a decrease.
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