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Standard Deviation Calculator

Enter a set of numbers to calculate standard deviation and other statistical measures.

Understanding Standard Deviation

A guide to what the numbers from our standard deviation calculator mean.

Standard deviation is a measure of how spread out the numbers in a data set are from their average (or mean). A low standard deviation means the numbers are very close to the average, while a high standard deviation means the numbers are spread out over a wider range.

Essentially, a standard dev calculator tells you how much "variety" or "dispersion" exists in your data.