Standard Deviation Calculator
Sample and population standard deviation, variance and mean from a list of numbers.
Sample SD (s)
13.4907
Population SD (σ)
12.3153
18
Mean
151.6667
Variance (σ²)
6
Count
How it works
Standard deviation measures how spread out numbers are around the mean. Use sample SD (÷ n−1) for a sample, population SD (÷ n) for the whole population.
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Frequently asked questions
Sample vs population SD?
Sample SD divides by n−1 (for data from a sample); population SD divides by n (for the entire population).
What is variance?
The square of the standard deviation — the average squared distance from the mean.
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