Standard Deviation Calculator
Compare population and sample standard deviation.
Results and explanation
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Numbers are processed locally. Results use floating-point arithmetic and up to 10 significant digits. List fields accept commas, spaces or line breaks.
How to use this calculator
Standard deviation is the square root of variance. Population calculations divide squared deviations by n; sample calculations divide by n − 1.
Worked example
For 1, 2, and 3, population deviation is approximately 0.8165 and sample deviation is 1.
Check the units and assumptions before using your result. Explore related calculators or read our statistics guides.