Standard Deviation Calculator – Free & Instant

Calculate mean, variance, population & sample standard deviation in one click. 100% free · Works offline · Nothing is sent anywhere.

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Data type:

Tip: paste Excel column

Standard Deviation

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Sample

Mean (Average)

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Variance

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Count (n)

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100% private — everything calculated instantly in your browser

How to Use

  1. Enter numbers (comma/space)
  2. Choose Sample (n-1) or Population
  3. Instant results

FAQ

Sample vs Population?

Sample uses n-1 (Bessel) → slightly higher value

Why two?

Population: σ = √(Σ(x-μ)²/N • Sample: s = √(Σ(x-x̄²/(n-1)