Standard Deviation Calculator
Measure how spread out your numbers are — with both sample and population formulas.
—Sample std. deviation (s)
—Population std. deviation (σ)
—Mean
—Sample variance (s²)
—Population variance (σ²)
—Standard error of the mean
—Coefficient of variation
—Count
—Sum
| x | x − mean | (x − mean)² |
|---|
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How it works
Standard deviation is the square root of the average squared distance from the mean. Use the sample formula (divide by n − 1) when your numbers are a sample of a bigger group — the usual case — and the population formula (divide by n) when you have every value.