Percentage Calculator
Calculate a percentage of a number.
Free calculator
Percentage Decrease Calculator
Calculate how much a value decreased as a percentage of the absolute original value.
How to use this tool
Compare a smaller new value with its non-zero original value.
Transparent method
Formula and method
Decrease % = |((new value − original value) ÷ |original value|) × 100|.
Example
A decrease from 100 to 75 is |((75 − 100) ÷ 100) × 100| = 25%.
Assumptions and limits
- The original value cannot be zero.
- The new value must be less than or equal to the original value.
Frequently asked questions
Why can the original value not be zero?
A percentage change divides by the original value, so a zero baseline has no defined percentage change.
Is percentage decrease the same as percentage difference?
No. Percentage decrease uses the original value as its baseline. Percentage difference usually compares both values symmetrically.
Related tools
Percentage Increase Calculator
Measure the percentage increase from one value to another.