Math
Standard deviation
Calculate population mean, variance and standard deviation for five values.
Calculators / Math / Coefficient of variation
Coefficient of variation calculator
Compare standard deviation with a nonzero mean.
On this page
Coefficient of variation16%
Calculator controls
How to calculate
Compare standard deviation with a nonzero mean.
coefficient of variation = standard deviation ÷ |mean| × 100
Worked example
Mean: 50; Standard deviation: 8.
Coefficient of variation: 16 %.
Assumptions and limits
CV is usually meaningful for ratio-scale data with a meaningful zero. It becomes unstable when the mean is close to zero.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Compare standard deviation with a nonzero mean. The result follows the displayed formula and keeps every adjustable assumption visible.
When this tool is useful
Use this tool to plan quantities or compare scenarios before making a purchase or technical decision.
Understanding your inputs
| Input | What to enter |
|---|---|
| Mean | Enter a number of at least -1000000000000 and no more than 1000000000000. |
| Standard deviation | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What can change the coefficient of variation result?
CV is usually meaningful for ratio-scale data with a meaningful zero. It becomes unstable when the mean is close to zero.
Should I round the inputs first?
No. Enter the best measurements available and round only the practical final quantity, such as full packs, boards, sheets, or components.