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Percent Difference Calculator

Compare two values of equal standing with the average based formula, and see the same pair measured as a percent change.

Percent difference calculator

Percent difference: —
Absolute difference: —
Average of the two values: —
Percent change from a to b: —
—
Percent difference treats both values equally, while percent change uses the first value as the starting point.

How to use the Percent Difference Calculator

  1. Enter the first value you want to compare.
  2. Enter the second value, which has equal standing.
  3. Read the percent difference and compare it with the percent change line.

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Frequently Asked Questions

Common questions about the free online percent difference calculator.

Percent difference compares two values of equal standing by dividing their absolute gap by the average of the two values.
Percent change treats one value as the starting point, while percent difference treats both values equally and divides by their average.
It is the absolute difference between the two values divided by half their sum, then multiplied by one hundred.
Use percent change when one value is clearly the original and the other is the new value after a change over time.
No. Because the numerator uses the absolute difference, percent difference is always zero or a positive percentage.
Then the average is zero and percent difference is undefined, because the formula would divide by zero. The tool warns you.
No. Both values stay in your browser, and the comparison is calculated on your own device without any upload.
Yes. It is completely free with no account, no limit, and it works on phones, tablets and desktop computers.

Last updated: October 10, 2026