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Standard Deviation Calculator In Probability theory, Standard Deviation represent the variation exists from the Mean value or expected value (average). In simple words, it is a measure of Numbers which are spread out. Standard deviation is represented by the Greek letter sigma (σ). Basically it is a Square root of variance. We provide an Online Standard Deviation Calculator for free which makes your calculations easy and fast. This online tool will provide you standard deviation of given set of data in one click. Before calculating standard deviation we need to find out mean and variance of given set of data.