Percentage Decrease Calculator
Find how much something dropped in percent, or take a percentage off a number.
Percentage decrease from A to B
—Decrease
—Difference
—Remaining share
Decrease a number by a percentage
%
—Result
—Amount removed
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How it works
Percentage decrease = (original value − new value) ÷ original value × 100. From 120 to 90 the decrease is 30 ÷ 120 = 25%. To decrease a number by a percentage, multiply it by (1 − percentage ÷ 100): 250 − 20% = 250 × 0.8 = 200.
FAQ
How do I find the original value before a decrease?
Divide the new value by (1 − percentage ÷ 100). After a 20% drop to 200, the original was 200 ÷ 0.8 = 250.