Standard Deviation Calculator

Calculate population & sample std dev

How to Use

Type or paste numbers separated by commas, spaces, or new lines.

Select population (σ) or sample (s) standard deviation.

See standard deviation, variance, mean, and step-by-step calculation.

What does standard deviation measure?

Standard deviation measures how spread out numbers are from the mean. Higher values mean more variability.

When to use population vs sample standard deviation?

Use population (σ) when you have all data points. Use sample (s) when data is a sample of a larger population.

What is variance?

Variance is the square of standard deviation. It measures the average squared deviation from the mean.

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