Percentage Change Calculator
Find the percentage increase or decrease from an original value to a new value.
How to calculate percentage change
Subtract the original value from the new value, divide that difference by the absolute original value, then multiply by 100. A positive result is an increase; a negative result is a decrease.
Formula: ((new − original) ÷ |original|) × 100
Example
A price moving from $80 to $100 increased by $20. Dividing 20 by 80 gives 0.25, so the percentage increase is 25%.
Frequently Asked Questions
The formula requires division by the original value, and division by zero is
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Yes. The result labels the change and also shows the signed numeric difference.