Standard Deviation Calculator

Compute sample and population standard deviation and variance from a data set.

Numbers (comma / space / line separated):

How to use

Paste your numbers and click Calculate. Everything runs in your browser — nothing is uploaded or stored.

Sample or population — which do I use?

Sample (n−1) for a subset of data; population (n) when you have every value.

What does the number mean?

Roughly how far values typically fall from the mean.

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