# Standard Deviation Calculator

This shows you the step-by-step calculations to work out the Standard Deviation (see below for formulas).

Enter your numbers below, the answer is calculated "live":

When your data is the whole population the formula is: |
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When your data is a sample the formula is: (The "Sample Standard Deviation") |

The important difference is "N-1" instead of "N" ... read more at Standard Deviation Formulas.