Variance is the average of the squared differences from the mean. It measures how spread out the data is. Standard deviation is the square root of variance and is easier to interpret.

Sample vs population variance?

Sample variance divides by (n-1) to correct for bias when estimating population variance from a sample (Bessel's correction). Population variance divides by n when you have all the data.

Variance Calculator

Quick answer: Enter a list of numbers to calculate variance and standard deviation for sample or population.

Calculate variance (the average squared deviation from the mean) and standard deviation for any dataset. Supports both sample variance (÷n-1) and population variance (÷n).

Last reviewed: April 2026Report an error

Enter numbers

Population variance (÷n)

Variance

4.5714

Variance: 4.5714, Std Dev: 2.1381, Mean: 5.0000.

Variance

4.5714

Standard Deviation

2.1381

Mean

5.0000

Count

How to Use This Variance Calculator

1Enter your numbers separated by commas or spaces.
2Choose sample (÷n-1) or population (÷n) variance.
3Read variance, standard deviation, mean, and count.

Frequently Asked Questions

: Variance is the average of the squared differences from the mean. It measures how spread out the data is. Standard deviation is the square root of variance and is easier to interpret.
: Sample variance divides by (n-1) to correct for bias when estimating population variance from a sample (Bessel's correction). Population variance divides by n when you have all the data.

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Variance Calculator

How to Use This Variance Calculator

Frequently Asked Questions

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