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:
|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.