σ
Standard Deviation Calculator
Sample & population SD, variance and mean from a data set.
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Results
Sample SD
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Population SD
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Mean
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Sample Variance
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Count
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How to use the Standard Deviation Calculator
Paste comma-separated numbers for sample SD, population SD, variance, mean and count.
Frequently Asked Questions
Use sample (n−1) when your data is a subset; population (n) when you have every value. Research almost always uses sample.