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Module · Math · Statistics
Standard Deviation
Compute sample or population standard deviation, variance, and coefficient of variation from any list of numbers.
Data type
5.2372
Standard deviation (σ or s)
Mean (x̄ or μ)18
Variance27.4286
Coefficient of variation29.10%
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Guide
How Standard Deviation works
Step 01
Enter data set
Paste comma-, space- or newline-separated numbers.
Step 02
Pick sample or population
Sample uses n−1 (Bessel's correction); population uses n.
Step 03
See σ, variance, CV
Standard deviation, variance, mean and coefficient of variation (SD/mean × 100).
FAQ
Frequently asked
Sample vs population — which do I use?+
Sample (n−1) if the data is a subset of a larger population. Population (n) if you have all data points.
What is coefficient of variation?+
SD divided by the mean, as a percentage — a unit-less measure of dispersion useful for comparing data sets of different scales.