Standard Deviation Calculator
Spread of a dataset, with both sample and population standard deviation.
Free to use · No account required
Enable JavaScript to use the interactive Standard Deviation Calculator. The input fields and calculations run in your browser.
How it works
Population σ = √(Σ(x − μ)² ÷ N). Sample s divides by (N − 1) instead — use sample SD for data drawn from a larger population. Variance is SD².