What This Calculator Measures
Percentage decrease measures a reduction from an original value to a lower new value. It expresses the amount of decrease as a percentage of the original value.
Use it for reductions in prices, quantities, sales, traffic, or other values measured in the same unit.
Percentage Decrease Formula
Formula
((Original value − New value) ÷ Original value) × 100
The original value is the denominator because it is the starting reference.
The original value must be greater than zero. A higher new value is an increase and is identified as such by the calculator.
How to Calculate It
Step-by-step method
- Subtract the new value from the original value.
- Divide that decrease by the original value.
- Multiply by 100 to express the result as a percentage.
From 200 to 150: 200 − 150 = 50.
(50 ÷ 200) × 100 = 25% decrease.