Standard deviation calculator


Calculates the standard deviation (SD) of a series of numbers (x).
In statistics, the standard deviation (SD) is a measure that is used to quantify the amount of variation or dispersion of a set of data values. The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance.

Related formulas


SDStandard deviation (dimensionless)
xSet of numbers (dimensionless)