Percentage Decrease Calculator
Find the percentage decrease from an original value to a smaller new value.
Example
Going from 120 to 90 is a 25% decrease because the drop of 30 is one quarter of 120.How do you calculate percentage decrease?
To calculate a percentage decrease, subtract the new value from the original value, divide that difference by the original value, then multiply by 100. The formula is: percentage decrease = (original value − new value) ÷ original value × 100.
Example: a value falling from 120 to 90 is a 25% decrease, because the drop of 30 divided by the original 120 equals 0.25, or 25%. If the new value is larger than the original, you have an increase instead.
Frequently asked questions
Everything you need to know to read the result with confidence.
What does the Percentage Decrease Calculator do?+
Find the percentage decrease from an original value to a smaller new value.
How do I use this percentage decrease calculator?+
Enter the old value and the lower new value. The result shows how much the old value fell in percentage terms.
What inputs should I enter?+
Enter original value, new value. Leave the default values in place when they match your situation.
What formula does this calculator use?+
Percentage decrease = (original value - new value) / original value x 100.
Can I share my result?+
Yes. Change the inputs, copy the page link, and the current inputs will be included in the URL for sharing or reopening later.