Math calculator
Percent Change Calculator
Calculate the signed percent change from an original value to a new value.
How this calculation works
((new value − original value) ÷ |original value|) × 100 Use the calculator above to enter your values. Inputs are checked before a result is shown, and calculations run locally in your browser.
From 80 to 100: ((100 − 80) ÷ 80) × 100 = 25% increase.
From 100 to 80: ((80 − 100) ÷ 100) × 100 = −20% change.
From 50 to 50: no change, or 0%.
Frequently asked questions
How does the percent change calculator work?
((new value − original value) ÷ |original value|) × 100
What is an example?
A change from 80 to 100 is a 25% increase; from 100 to 80 it is a 20% decrease.
Can I enter decimal values?
Yes. Enter decimal values where appropriate. The calculator checks required inputs and displays a readable result.
Are results rounded?
Results are formatted for readability. Check the displayed formula and units when using the result.
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