Percentage Change Calculator
Calculate percentage change between two values.
Percentage Change measurements
Enter your values, then calculate.
Result
How to calculate percentage change
This calculator finds percentage change between an original value and a new value — one of the most widely used calculations for tracking growth or decline.
How the calculation works
Percentage change = ((New value − Original value) ÷ Original value) × 100.
Example
A value going from 80 to 100: ((100−80)÷80)×100 = 25%.
Frequently asked questions
How is Result calculated?
Result = ([New value] − [Original value]) ÷ [Original value] × 100.
Is the Percentage Change Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Percentage Change Calculator
Percentage change = ((New value − Original value) ÷ Original value) × 100.
Let's understand your percentage change result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Percentage Change
- A positive result means growth/increase; a negative result means decline/decrease.
- Percentage change is not symmetric — a 25% increase from 80 to 100 is not undone by a 25% decrease from 100 (which would land at 75, not 80).
Common Percentage Change Mistakes to Avoid
- Assuming a percentage increase and the same percentage decrease cancel out exactly, when they don't due to the changing base value each calculation uses.
When to Use This Calculator
This calculator finds percentage change between an original value and a new value — one of the most widely used calculations for tracking growth or decline.