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Percent Decrease Calculator
All math tools
Calculate the percentage reduction of a value over time.
Reduction Data
Original Value
New (Smaller) Value
Reduction Summary
Percentage Decrease
25.00%
Amount Removed
30
About this calculator
Understanding Percent Decrease
Percent decrease measures the relative reduction of a value. It is the absolute decrease divided by the original value, expressed as a percentage.
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Pro Tips
If you buy something on sale, the 'discount' is the percent decrease from the original price.
A 50% decrease means the value has been cut in half.
Always use the original (older) value as the denominator.
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Fun Facts
"In chemistry, yield reduction is often discussed in terms of percent decrease from the theoretical maximum."
Formula: ((Old - New) / Old) * 100
