Percentage Change Calculator
Calculate the percentage change between a starting value and an ending value.
INPUTS
RESULTS
Method and assumptions
Difference = end − start. Percentage change = (end − start) / |start| × 100. The absolute starting value makes the sign reflect movement when the starting value is negative.
Common mistakes and edge cases
A zero starting value has no defined percentage change. Negative bases can be ambiguous in business reporting; use the stated convention consistently. A 20% decrease and a 20% increase do not cancel.
How to use
- Enter the starting value.
- Enter the ending value.
- The absolute difference and percentage change are calculated instantly.
Example
From 100 to 125: difference 25 and change +25%. From −100 to −75: difference 25 and change +25% under this tool's absolute-base convention.
Frequently asked questions
- How is percentage change calculated?
- (end − start) / |start| × 100.
- What if the starting value is zero?
- Percentage change is undefined when the starting value is zero.
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This tool is provided for general informational and workflow purposes only. It does not constitute financial, investment, tax, or professional advice. All calculations run in your browser; no input data is transmitted or stored.