Coefficient of Variation Calculator
Relative variability — compare spread across different scales.
Enter your values
ⓘ Live results
Results
- Coefficient of variation
- 9.25%
- Mean
- 44.6667
- Sample SD
- 4.1312
- Population SD
- 3.7712
- Population CV
- 8.44%
- Reading
- Low variability (under 10%)
Quick answer
The coefficient of variation is the standard deviation divided by the mean, expressed as a percentage — a scale-free measure of relative spread.
CV = (s ÷ x̄) × 100%
How to use the Coefficient of Variation Calculator
- 1Paste your values separated by commas.
- 2Read the CV as a percentage of the mean.
- 3Compare CVs between datasets that use different units or scales.
Worked example
Using the values the calculator loads with:
Inputs
- Data values42, 45, 39, 51, 47, 44
Results
- Coefficient of variation9.25%
- Mean44.6667
- Sample SD4.1312
- Population SD3.7712
- Population CV8.44%
- ReadingLow variability (under 10%)
Frequently asked questions
When is CV misleading?
When the mean is near zero or the data can be negative — the ratio explodes and loses meaning.
What is a good CV in a lab assay?
Under 10% is usually acceptable for precision, and under 5% is considered tight, but check your field's guidance.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.