Find the standard deviation, variance, mean, and statistical range of sample or population datasets. Free online tool.
Separate values with commas (e.g. 10, 12, 23, 24, 30):
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Enter numerical values separated by commas, and standard deviation results automatically compute in the stats summary card. Read about variance calculation methods at Wikipedia.
Population SD (ฯ) is used when you have the complete dataset. Sample SD (s) uses Bessel's correction (n - 1) and is used when you have a sample representing a larger population.
Variance is the average of the squared differences from the Mean. Standard deviation is simply the square root of variance.