Percentage Decrease Calculator
Find how much a number decreased compared with its original value.
Percentage Decrease Calculator
Percentage Decrease Calculator Formula
Use this formula to check the result from the percentage decrease calculator or to calculate it by hand.
Formula
((new value - old value) / |old value|) x 100
Example
Steps
- 180 - 100 = -20
- 2-20 / 100 = -0.2
- 3-0.2 x 100 = -20%, or a 20% decrease
When to use this calculator
Worked examples
From 100 to 80 is a 20% decrease.
From 250 to 200 is a 20% decrease.
Common mistakes
- Dropping the negative sign before deciding whether the result is an increase or decrease.
- Dividing by the new value instead of the original value.
Other Calculators
Simple tools for nearby percentage questions.
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Calculate a percentage, percent of a number, or part of a whole.
Percentage Increase Calculator
Find percent growth from one value to another.
Percentage Difference Calculator
Compare two values using percentage difference.
Percentage Change Calculator
Calculate increases and decreases between old and new values.
Discount Calculator
Find sale prices and savings from a discount percent.
FAQ
Subtract the old value from the new value, divide by the absolute old value, then multiply by 100. A negative result means a decrease.
Multiply the original value by 20 / 100 to find the decrease amount, then subtract it from the original value.