Coefficient of Variation Calculator
Relative variability — compare spread across different scales.
Enter your values
Enter the data values you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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%
At a glance
| What it does | Relative variability — compare spread across different scales. |
|---|---|
| Category | Statistics |
| Inputs needed | Data values |
| Main output | Coefficient of variation |
| Formula | CV = (s ÷ x̄) × 100% |
| Cost | Free — no sign-up, no download |
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.
Inputs explained
- Data values
- Enter the data values you are working with.
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.
What do I need to enter into the Coefficient of Variation Calculator?
Just 1 value: data values. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Coefficient of Variation Calculator work out the answer?
The coefficient of variation is the standard deviation divided by the mean, expressed as a percentage — a scale-free measure of relative spread. It applies the formula CV = (s ÷ x̄) × 100% and shows the working so you can check each step by hand.
Is the Coefficient of Variation Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.