CALCULATOR
Percentage Decrease Calculator
Percentage Decrease. Example: Original quantity: 80, New quantity: 60 gives 25 %. Find the signed percentage decrease relative to a positive original quantity. A negative answer means the quantity moved in the opposite direction. Original values below 1 and zero are outside this bounded tool; the original/new ratio defines the rate, not a supplied percentage adjustment.
How the calculation works
100 × ((original − new) / original)
Worked example
With original quantity 80 units, new quantity 60 units, percentage result is 25 %.
Assumptions and limits
Find the signed percentage decrease relative to a positive original quantity. A negative answer means the quantity moved in the opposite direction. Original values below 1 and zero are outside this bounded tool; the original/new ratio defines the rate, not a supplied percentage adjustment.