Standard Deviation Calculator

Measure variance and standard deviation for population or sample datasets.

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About this tool

What is Standard Deviation Calculator?

Standard Deviation Calculator measures how far values typically spread from their arithmetic mean.

Three simple steps

01
Enter the complete number dataset.
02
Choose population or sample calculation depending on what the values represent.
03
Review count, mean, variance and standard deviation.

Common questions

What is the difference between sample and population deviation?

Population variance divides by n, while the sample estimate divides by n minus 1 to correct for estimating from limited observations.

Is Standard Deviation Calculator private to use?

Yes. Number parsing, statistics, conversions and random generation all run locally in your browser.