Standard Deviation Calculator
Calculate mean, population and sample variance, and standard deviation from a dataset.
How to use the tool
Enter the requested values and choose a mode or operation when needed. Fields start empty so results always reflect your own data.
For 2, 4, 4, 4, 5, 5, 7, 9, the mean is 5 and population deviation is 2.
Formula and method
Sample statistics require at least two observations.
σ² = Σ(x−μ)²/N · s² = Σ(x−x̄)²/(n−1)
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