MyCalculatorHow it works
Formula: ((Old − New) ÷ Old) × 100.
Example
From 180 to 150: ((180−150)÷180)×100 = 16.67% decrease.
Assumptions & limitations
If the new value is higher than the original, this represents an increase rather than a decrease.
Frequently asked questions
What if the value went up instead?
Use the percentage increase calculator, or note that this result will show as negative.