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Both calculators run independently — change the inputs on either side to compare results.
Statistics
Standard Deviation Calculator
Compute the sample standard deviation directly from three summary statistics — sample size n, the sum of values Σx, and the sum of squared values Σx². This is the spread metric used in virtually every empirical study, quality-control chart, and risk model.
Fill in the required fields to see your result.
Statistics
Coefficient of Variation Calculator
Compute the coefficient of variation (CV), a dimensionless measure of relative variability defined as the standard deviation divided by the mean, expressed as a percentage. Used to compare variability across datasets with different units, magnitudes, or context — investment risk, biological variability, measurement precision.
Fill in the required fields to see your result.
Key differences
| Standard Deviation Calculator | Coefficient of Variation Calculator | |
|---|---|---|
| Category | Statistics | Statistics |
| Inputs required | 3 | 2 |
| Result | Standard Deviation | Coefficient of Variation (%) |
| What it does | Compute the sample standard deviation directly from three summary statistics — sample size n, the sum of values Σx, and the sum of squared values Σx². This is the spread metric used in virtually every empirical study, quality-control chart, and risk model. | Compute the coefficient of variation (CV), a dimensionless measure of relative variability defined as the standard deviation divided by the mean, expressed as a percentage. Used to compare variability across datasets with different units, magnitudes, or context — investment risk, biological variability, measurement precision. |