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Calculate standard deviation, variance, mean, and other statistics for a data set.
Count (n)
8
Mean
18
Median
18.5
Std Dev (Ļ)
4.898979
Std Dev (s)
5.237229
Variance (ĻĀ²)
24
Variance (sĀ²)
27.428571
Sum
144
Range
13
Min
10
Max
23
Pro includes regression analysis, confidence intervals, histograms, and CSV data import.
Standard deviation measures how spread out numbers are from the mean. A low SD means data points cluster near the mean; high SD means they're spread out.
Population SD divides by N, sample SD divides by N-1 (Bessel's correction). Use sample SD when your data is a subset of a larger population.
Standard Deviation Calculator is part of BriskTool's collection of free online tools. All processing runs entirely in your browser for maximum privacy and speed.