Standard Deviation Calculator

This Standard Deviation Calculator computes both population and sample standard deviation for a given dataset. Enter numbers separated by commas and get accurate results instantly.

Enter Data (comma separated):

Population Sample

What is Standard Deviation?

Standard deviation measures how spread out numbers are from the mean. A lower value means data points are close to the mean, while a higher value indicates greater variability.

Formulas

Population SD: √( Σ(x − μ)² / N )

Sample SD: √( Σ(x − x̄)² / (N − 1) )

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