Standard Deviation Calculator (5 Numbers)

Enter five numbers to calculate their mean, variance and standard deviation.

Standard Deviation Calculator (5 Numbers)

Calculate the mean, variance and population standard deviation of five numbers.

This calculates population standard deviation (dividing by n), not sample standard deviation (dividing by n-1). For a sample estimate, results will differ slightly.

Standard deviation measures how spread out a set of numbers is from their mean. This calculator computes the population mean, variance (the average squared distance from the mean) and standard deviation (the square root of variance) for five values.

Example

  • With the default values shown above, this calculator returns: Mean (Average) ≈ 5.200; Variance ≈ 2.960; Standard Deviation ≈ 1.720.

Frequently Asked Questions

What is the difference between population and sample standard deviation?

Population standard deviation divides the sum of squared differences by the total count (n), while sample standard deviation divides by n-1 to correct for estimating from a subset — this calculator uses the population formula.

What does a low standard deviation mean?

A low standard deviation means the numbers are clustered close to the mean; a high standard deviation means they are more spread out.

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