Percentage Decrease Calculator
Measure how much a value dropped from an original amount to a new amount, as a percentage.
Percentage Decrease Calculator
Measure how much a value dropped from an original amount to a new amount, as a percentage.
How to use the Percentage Decrease Calculator
- Enter the original (starting) value.
- Enter the new (lower) value.
- Click Calculate.
Formula
% decrease = ((Old − New) / |Old|) × 100
Example
From 200 to 150: ((200−150) / 200) × 100 = 25%
Step-by-step calculation
- Find the difference: 200 − 150 = 50.
- Divide by the original: 50 ÷ 200 = 0.25.
- Convert: 0.25 × 100 = 25% decrease.
Real-world uses
- Measuring price drops and discounts.
- Tracking weight loss or decline.
- Monitoring cost reductions.
Common mistakes
- Using the new value as the base.
- Reporting the result as positive when it should indicate a decrease.
- Dividing by the smaller number instead of the original.
Frequently asked questions
Can decrease exceed 100%?
No. A decrease can never exceed 100% because you cannot reduce below zero.
What if the new value is higher?
That represents an increase. Use the Percentage Increase Calculator.
How do I calculate a 30% reduction on $500?
500 × 0.30 = $150 off. New price: $500 − $150 = $350.