Standard Deviation Calculator

Calculate standard deviation, variance, mean, and more from a data set

Last reviewed: March 2026How we build & verify

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Population Std Dev

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Sample Std Dev

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Population Variance

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Sample Variance

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Mean

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Count

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Sum

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Range

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Frequently Asked Questions

No. Standard Deviation Calculator is free and works without creating an account. Open the page and start using it.

We check Standard Deviation Calculator periodically to keep it working correctly and to make small improvements based on how people actually use it. The date at the top of the page shows the last review. Found a bug or have a suggestion? There's a feedback button in the bottom-right corner.