Standard Deviation Calculator vs Variance Calculator
Two calculators for the same neighbourhood of questions. Here is what each measures, what you feed in, and where you'd reach for one over the other.
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.
- Answers
- Standard Deviation
- Inputs
- Sample Size, Sum of Values, Sum of Squares
Variance Calculator
Compute population or sample variance from the sum of squared deviations and the sample size. The fundamental measure of how spread out a dataset is around its mean, and the building block of standard deviation, ANOVA, and most parametric inference.
- Answers
- Variance
- Inputs
- Number of Values, Sum of Squared Deviations, Variance Type
At a glance
| Standard Deviation Calculator | Variance Calculator | |
|---|---|---|
| Category | Statistics | Statistics |
| Answers | Standard Deviation | Variance |
| Inputs | 3 | 3 |
| Result unit | — | — |
When to use each
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 population or sample variance from the sum of squared deviations and the sample size. The fundamental measure of how spread out a dataset is around its mean, and the building block of standard deviation, ANOVA, and most parametric inference.