Percentage Difference Calculator
The percentage difference between two values uses their average as the base — this is different from percent change, because no value here is old or new.
How to use
- Enter the first value and the second value in the two boxes.
- The tool averages the two values and divides the difference by that average — neither value is treated as the 'old' one, which is why this differs from percent change.
- Read the percentage difference, the absolute difference and the average, which update live as you type.
- Use this tool for comparing two similar values, such as two prices or two measurements.
Note: Formula: percentage difference = (|V1 - V2| / average of V1 and V2) x 100. If both values are zero, the result is zero.
Tips
- Use this when neither value is the 'before' — for example, comparing two shops' prices.
- For before-and-after comparisons, use percent change instead.
- The result is always positive, no matter which order you enter the values.
Frequently Asked Questions (FAQ)
What does the percentage difference calculator do?
Enter two values and it shows the difference, the average of the two values, and the percentage difference — updating live as you type.
What is the formula for percentage difference?
The absolute difference between the two values divided by their average, then multiplied by 100.
How is percentage difference different from percent change?
Percent change compares one value against a starting value, while percentage difference treats both values equally and compares them to their average — so the result is the same whichever value you enter first.
When should I use percentage difference?
When neither value is clearly the original — for example when comparing two prices, two measurements, or two experiment results.