Statistics
Coefficient of Variation Calculator
Use coefficient of variation to compare relative spread across data sets measured on comparable ratio scales.
Coefficient of variation
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- Mean
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- Standard deviation
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What the coefficient of variation calculator solves
Use coefficient of variation to compare relative spread across data sets measured on comparable ratio scales.
Formula
How to use it
- Enter a data list.
- Choose sample or population standard deviation.
- Compare CV percentages only when the context makes sense.
How to read the answer
CV expresses spread relative to the mean, which can help compare variability across scales.
Common mistakes and edge cases
- Do not use CV when the mean is zero or near zero.
- CV is not appropriate for arbitrary interval scales.
- Outliers affect standard deviation and CV.
Worked examples
Small relative spread
Coefficient of variation
9.32%
Larger spread
Coefficient of variation
73.42%
Frequently asked questions
Why use absolute mean?+
Using absolute mean keeps the CV as a nonnegative relative-spread measure.
Is lower CV always better?+
Only if lower relative variability is desirable in that context.
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Last updated: May 15, 2026