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Both calculators run independently — change the inputs on either side to compare results.

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.

Sample Size

Sum of Values

Sum of Squares

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Statistics

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.

Number of Values

Sum of Squared Deviations

Variance Type

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Key differences

	Standard Deviation Calculator	Variance Calculator
Category	Statistics	Statistics
Inputs required	3	3
Result	Standard Deviation	Variance
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 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.