How this Percentage Decrease Calculator works
Percentage decrease shows the size of a decline relative to the original value.
Formula
((Original − New) ÷ Original) × 100
Worked example
A change from 100 to 80 is a decrease of 20%.
How to interpret the result
The decrease is measured relative to the original value, which is the baseline.
Common mistakes and limits
Do not divide by the new value, and remember that a zero original value cannot be used as a percentage baseline.
Frequently asked questions
Can this result be negative?
If the new value is greater than the original value, the calculation represents an increase rather than a decrease.
Important note
WorkTools provides general-purpose informational calculations. Verify inputs, definitions, policies and jurisdiction-specific requirements before using a result for financial, payroll, legal or other consequential decisions.