Math
Standard Deviation Calculator
Compute mean, variance and standard deviation.
Count
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Mean
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Variance (pop.)
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SD (population)
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SD (sample)
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FAQ
- What is the difference between population and sample standard deviation?
- Population SD (sigma) divides by N and describes the spread of a complete dataset. Sample SD (s) divides by N-1 (Bessels correction) and is used when the data is a sample drawn from a larger population, giving an unbiased estimate.
- How do I enter numbers?
- Separate values with commas, spaces, tabs, or newlines. Mixed separators are fine. Non-numeric tokens are silently ignored so you can paste spreadsheet columns directly.
- Is my data sent to a server?
- No. All calculations run entirely in your browser. Nothing is uploaded or stored.