Standard Deviation Calculator

Instantly measure how spread out your data is.

💡 Enter numbers separated by commas or spaces. Results are calculated instantly in your browser.

Standard deviation: —

Uses the population standard deviation formula.

Example 1

Data: 2, 4, 4, 4, 5, 5, 7, 9 → Mean = 5 → Standard deviation = 2

Data A: 4, 5, 5, 6 → Small deviation (values close together) Data B: 1, 5, 9, 13 → Larger deviation (values more spread out)

Population standard deviation formula:

σ = √( Σ (x − μ)² / N )

Where μ is the mean and N is the number of values.

Standard deviation measures the average distance of each value from the mean. A higher value means greater variability in the dataset.

It helps measure volatility, uncertainty, and consistency in data. Widely used in finance, science, risk analysis, and research.

It measures how spread out a dataset is around its mean.

Values vary widely from the average.

This calculator uses the population standard deviation formula.

Yes. Extreme values can significantly increase the result.