Standard Deviation Calculator

Standard deviation measures the spread or dispersion of a data set relative to its mean. A low standard deviation indicates that values are close to the average, while a high standard deviation indicates that values are spread out over a wider range.

Calculation Type

Statistical Summary

Standard Deviation (s): 0
Count (N)0
Sum (Σx)0
Mean (x̄)0
Variance (s²)0

Sample vs. Population

The choice between "Sample" and "Population" is critical and depends on your data set:

  • Sample: Use this if your data is a sample of a larger population. This calculation uses N-1 in the denominator (Bessel's correction).
  • Population: Use this if you have data for the entire population. This calculation uses N in the denominator.