Percentage Change Calculator
Measure percentage increase or decrease from an old value to a new value.
Results are provided for general informational use. Verify important financial, health or legal figures before relying on them.
About this Percentage Change Calculator
The Percentage Change Calculator compares a new value with an original value and expresses the difference as a percentage of the original. It is useful for prices, traffic, revenue, scores, measurements and many before-versus-after comparisons.
For related tasks, try Percentage Calculator, Ratio Calculator or Investment Return Calculator.
How the calculation works
Percentage change is calculated as (new value − original value) ÷ |original value| × 100. When the original value is zero, a standard percentage change is not defined.
How to use it
- Enter the original value.
- Enter the new value.
- Calculate to see the absolute change and percentage change.
Practical example
If a value rises from 80 to 100, the increase is 20 and the percentage change is 25%.
Frequently asked questions
Can the result be negative?
Yes. A negative result indicates a decrease.
Why can’t percentage change start from zero?
Because the formula divides by the original value, so zero would require division by zero.
Is percentage change the same as percentage points?
No. Percentage points compare two percentages directly, while percentage change is relative to the original value.
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