Forward changes multiply by a factor; reversing changes divides by that same factor. A 20% increase is reversed by a 16.6667% decrease, because 20 divided by 120 is one sixth.
Compare with numbers
If a price after a 20% increase is 120, the original price was 100: divide 120 by 1.20. Subtracting 20% of 120 produces 96 because it uses the new price as its base.
Which quantity should you enter?
For an increase of p%, divide the new value by 1 + p/100. For a reduction of p%, divide by 1 − p/100. A 100% reduction cannot be reversed from the final value alone.
Try your own values
Use the reverse percentage calculator to test your inputs. Save two scenarios to compare results, or copy an input link to revisit your calculation.
