Variance Calculator

Calculate variance and standard deviation for sample or population data.

Last updated: June 2026 | By Patchworkr Team

Data set

Calculation steps

Compute the mean of the data set.

Square each difference from the mean.

Divide by n or n - 1 depending on the data type.

Statistics

Results calculated below

Mean: 30.0000

Variance: 250.0000

Std. deviation: 15.8114

What Is Variance?

Variance measures how spread out a data set is from its mean.

Sample variance divides by n - 1, while population variance divides by n.

Yes. A meaningful variance calculation needs at least two numbers.

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