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Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the whole from a part.
Percentage Difference Calculator
Compare two values with the percentage difference, relative to their average.
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Formula
percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100
Use it when neither value is the “original”, for example comparing two stores’ prices or two measurements. 40 vs 60: 20 ÷ 50 × 100 = 40%. If one value is the starting point, use percent change instead.
Frequently asked questions
Is percentage difference the same as percent change?
No. Percent change divides by the old value; percentage difference divides by the average of both.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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