Percentage Change Calculator
Calculate percentage increase or decrease between values
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What is this tool?
Percentage change calculator computes the relative change between two values as a percentage. It shows whether the change is an increase or decrease and by how much. Essential for tracking price changes, performance metrics, population growth, and any scenario comparing before-and-after values.
How to use
- 1
Enter original value
Input the starting value (before).
- 2
Enter new value
Input the ending value (after).
- 3
View change
See percentage increase or decrease with the formula.
Frequently Asked Questions
Can percentage change exceed 100%?
Yes. If the new value is more than double the original, percentage change exceeds 100%. For example, going from 10 to 30 is a 200% increase. Percentage decrease can never exceed 100% (you can't go below zero).
Can change exceed 100 percent?
Yes. Tripling equals 200 percent change.
Why is percentage change asymmetric?
A 50% increase followed by a 50% decrease does not return to the original value. For example, $100 increased by 50% = $150. $150 decreased by 50% = $75, not $100. To recover from a 50% decrease, you need a 100% increase. This asymmetry is why percentage changes can be misleading and why log returns are used in quantitative finance.