Percentage Change Calculator

Calculate percentage increase or decrease between an original value and a new value. Free to use online with no sign-up.

Enter the original and new values to see the absolute change, percentage change and whether the value increased or decreased.

Formula

Percentage change = (new value − original value) ÷ |original value| × 100.

Example

Changing from 100 to 125 is a 25% increase.

Frequently asked questions

What happens when the original value is zero?: Percentage change is mathematically undefined when the original value is zero and the new value is non-zero. The tool still shows the absolute change.
Can it calculate decreases?: Yes. A negative percentage result indicates a decrease.