EVERYDAY MATH · FREE INTERACTIVE CALCULATOR
Percentage Change Calculator
Compare old and new values, including signed percentage increase or decrease. Change the inputs below to calculate a result immediately. No account required.
Percent change
25%Absolute difference
25How to calculate the answer
Change (%) = (new − original) ÷ |original| × 100.
Worked example
From 100 to 125 is a 25% increase.
For the example inputs shown above, the calculated results are:
| Percent change | 25% |
|---|---|
| Absolute difference | 25 |
How to interpret this result
When the original value is zero, ordinary percent change is undefined.
These figures illustrate the displayed method using the default inputs. Change the inputs to explore another case, and check units and conventions relevant to the problem.
Related calculators
Frequently asked questions
What is the formula for percent change?
(new − old) ÷ |old| × 100.
What if the original value is zero?
Percent change is undefined.
Is a drop followed by a rise symmetrical?
No. A 50% fall requires a 100% rise to recover.
Sources and further reading
Last updated: . Results are estimates for information only and are not financial, medical or professional advice.