Financial Calculators
Percentage Difference Calculator
Compare two values symmetrically when neither value is a designated starting point.
Calculations happen locally in your browser.
How to use this calculator
- Enter the two values to compare. Their order does not affect the result.
- Review the live result and use Copy result when you need to share it.
How the calculation works
The absolute difference is divided by the average magnitude of the two values, then multiplied by 100. Two zero values return 0% without dividing by zero.
Formula
Difference % = |first − second| ÷ ((|first| + |second|) ÷ 2) × 100
Step-by-step calculation
- Enter the two values to compare. Their order does not affect the result.
- The absolute difference is divided by the average magnitude of the two values, then multiplied by 100. Two zero values return 0% without dividing by zero.
- Check the displayed result, then copy it if needed.
Worked example
The percentage difference between 80 and 100 is about 22.22%.
Risk guidance
Frequently asked questions
Does this tool send my inputs anywhere?
No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.
How should I use the result?
Check that the entered units and values match your situation, especially around dates, breaks, and rounding.