Decrease a number by a percentage. Enter the starting value and the percent to remove.
Decreased Value
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After the decrease.Usage Tip
To subtract a percent fast, multiply by 1 minus the decimal: minus 20% is times 0.8, minus 25% is times 0.75. A 50% off then another 50% off is 75% off total, not 100%.
THE MATH
Decrease = value × percent%
Result = value − decrease
Result = value − decrease
A percent decrease takes a share off the original value. A 25% decrease is the value times 0.75.
A decrease cannot exceed 100% of the value (which would reach zero); beyond that the result goes negative.
A decrease cannot exceed 100% of the value (which would reach zero); beyond that the result goes negative.
Percent decreases come off the starting value, so the same percent removes more when the base is larger.
Successive decreases compound on the shrinking total, so two 10% cuts is a 19% drop, not 20%.
A decrease does not undo an equal-percent increase — up 25% then down 25% lands below the original.
Successive decreases compound on the shrinking total, so two 10% cuts is a 19% drop, not 20%.
A decrease does not undo an equal-percent increase — up 25% then down 25% lands below the original.