Statistics
Standard Deviation Calculator
Sample or population standard deviation and variance.
Free to use — no sign-up or login.
Standard deviation
Variance
Mean
Count
This free Standard Deviation Calculator covers Sample or population standard deviation and variance.
Enter the Standard Deviation Calculator fields, then read the output. Statistics calculators on this site keep the formula visible beside the form, with no account required.
Using the Standard Deviation Calculator
Sample or population standard deviation and variance. Typical inputs are Numbers (comma-separated) and Variance type. How it works beside the form states the identity the Standard Deviation Calculator applies.
FAQ
How do I use the Standard Deviation Calculator?
Open the Standard Deviation Calculator, fill Numbers (comma-separated) and Variance type, and read the result. Compute the mean, then the root-mean-square deviation.
What formula does the Standard Deviation Calculator use?
The Standard Deviation Calculator uses the identity in How it works. In words: Compute the mean, then the root-mean-square deviation.