Percentage Decrease Calculator
Work out percentage decreases in two ways: enter an original value and a percentage to find the new (lower) value, or enter the original and new values to find exactly what percentage it fell. Both modes show the absolute amount of the decrease.
What to calculate
%
The original value reduced by the given percentage
- 1
Convert percent to decimal
25% ÷ 100 = 0.25 - 2
Decrease factor
1 − 0.25 = 0.75 - 3
Value after decrease
200 × 0.75 = 150
How does this calculator work?
Percentage Decrease: New = Original × (1 − p/100); or find p = (Original − New) ÷ Original × 100. Use this to calculate the value after a price cut, discount, or loss — or to determine exactly what percentage something has fallen.
Formula
How this is calculated
A percentage decrease tells you how much a value has fallen relative to its original. In the first mode you know the original and the percentage — multiply the original by (1 − p/100) to shift it down by that fraction. For example, decreasing 200 by 25% gives 200 × 0.75 = 150, so the amount reduced is 50.
In the second mode you know the original and the new value and want the percentage. Subtract the new from the original to get the absolute drop, divide by the absolute original, then multiply by 100. Using the same numbers: (200 − 150) ÷ 200 × 100 = 25%.
Note that percentage decrease is always measured from the original (the starting value). A 25% decrease is not the same as a 25% increase in reverse: decreasing 200 by 25% gives 150, but increasing 150 by 25% gives 187.5, not 200.
Frequently asked questions
Multiply the original value by (1 − percentage ÷ 100). For example, a 25% decrease from 200 = 200 × (1 − 0.25) = 150.
Subtract the new value from the original, divide by the original, and multiply by 100: (Original − New) ÷ Original × 100.
No. A 50% decrease from 100 gives 50; a 50% increase from 50 gives 75 — not the original 100. Percentage increases and decreases are not symmetric.
Also known as
TG we-Calculate Editorial Team. (2026). Percentage Decrease Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/percentage-decrease-calculator
TG we-Calculate Editorial Team. "Percentage Decrease Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/percentage-decrease-calculator.
TG we-Calculate Editorial Team, "Percentage Decrease Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/percentage-decrease-calculator
@misc{wecalculate_percentage_decrease_calculator, title = {Percentage Decrease Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/percentage-decrease-calculator}}, year = {2026}, note = {TG we-Calculate} }
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