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":

 

We have just been using this formula: (The "Population Standard Deviation")
There is also this formula: (The "Sample Standard Deviation")

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