Math calculator
Percentage Decrease Calculator
Find the percentage and absolute decrease between an original value and a new value.
Percentage decrease
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Absolute decrease—
Original → new—
How it works
Subtract the new value from the original, divide by the absolute original value, then multiply by 100. If the new value is higher, the tool labels the result as an increase.
Percentage decrease = ((original − new) ÷ |original|) × 100
Worked example
From 200 to 150, the decrease is 50 and the percentage decrease is 25%.
How to use this tool
- Enter the known values and choose units where available.
- Check the primary result and supporting details.
- Clear or replace an input to calculate another case.
Frequently asked questions
What happens with invalid or incomplete inputs?
The result remains blank until the required inputs form a finite, meaningful calculation. Zero denominators and physically impossible negative quantities are not calculated.
Can I use decimal values?
Yes. The tool accepts decimals and keeps full precision for the calculation while rounding the displayed result for readability.