FORMULA
How the calculation works
Standard deviation is the square root of variance.
Use consistent units and review the assumptions shown beside the result.
MATH / FREE ONLINE TOOL
Standard Deviation Calculator
Calculate mean, population and sample standard deviation.
INPUT
LOCAL CALCULATIONEnter your values
RESULT
FORMULA v1.0.0Your calculation
ResultReady
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EXAMPLE
Worked example
Enter your values to receive an instant result with a clear breakdown.
Formula reviewed July 30, 2026 · Version 1.0.0
FAQ
Frequently asked questions
Is this calculator free?
Yes. It is free to use and does not require an account.
Are my values uploaded?
No. This calculation runs locally in your browser.
SOURCE & LIMITS
Methodology
Standard mathematical and industry formulas. Results are estimates for planning purposes.
Results are estimates. Confirm measurements, product specifications and professional requirements before making critical decisions.