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math / Free Online Tool

Standard Deviation Calculator.

Compute mean, variance, population standard deviation, and sample standard deviation from lists of values.

Input Parameters

Comments & Feedback.

Documentation

User manual & function guide.

Detailed manual explaining every function, input parameter, and operational example for the Standard Deviation Calculator.

Data Input

Function

Comma-separated list of numeric values.

Example Operation Data: 10, 20, 30, 40, 50

Mean & Variance

Function

Computes arithmetic mean and variance.

Example Operation Mean = 30.00, Population Variance = 200.00

Sample & Population Standard Deviation

Function

Computes standard deviation.

Example Operation Sample SD = 15.8114, Population SD = 14.1421

Frequently asked questions.

What is the difference between population and sample standard deviation?

Population SD divides by N (total count), while sample SD divides by N-1 (Bessel's correction). Use sample SD when analyzing a subset of a larger population, and population SD when you have data for the entire group.

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