Standard Deviation Calculator

Calculate the mean, variance, and population or sample standard deviation.

Measure how spread out a numeric list is around its mean.

Your inputs stay on your device

Calculate standard deviation

live result

Numbers

Dataset

Standard deviation

3.3541

Mean

16.5

Enter dimensions or values only; results are mathematical estimates and do not replace construction, engineering, or academic requirements.

Context & Reference

For inspecting spread in a numeric list.

calculator guide

Computes mean, variance, and square-root deviation using population or sample divisor.

Use this calculator with your own values, then review the clearly labelled result and copy it when you need it elsewhere.

Sample mode uses one fewer degree of freedom.

Enter 2, 4, 4, 4, 5, 5, 7, 9.

Sample mode requires at least two numbers.

This calculator runs locally in this browser. Sample mode requires at least two numbers.

Useful next steps

Continue with a closely related task, calculation, conversion, or local text tool.

Find the mean, median, minimum, and maximum of a number list.

Calculate percentage increase, decrease, and absolute difference.

Work out percentages, changes, and proportions in a blink.

Add, subtract, multiply, or divide two fractions.

Evaluate expressions with powers, square roots, and percentages.

Simplify a ratio and compare its two values.