How this calculation works
Calculate population or sample standard deviation and variance. The result is calculated locally in your browser from the visible inputs, and the method below remains available for checking.
Worked example
The population standard deviation of 2,4,4,4,5,5,7,9 is 2.
Assumptions and limits
- Inputs use the units shown beside each field.
- Intermediate values retain precision; displayed values are rounded for readability.
Questions people ask
How does the Standard Deviation Calculator work?
It applies this displayed method: Standard deviation is the square root of average squared distance from the mean; sample mode divides by n−1. Values stay in your browser and are not submitted to a server.
What should I check before using the Standard deviation result?
Inputs use the units shown beside each field. Intermediate values retain precision; displayed values are rounded for readability. The result follows the displayed mathematical definition and the precision of the values entered.
Does this Standard deviation calculator save my information?
No. Calculation inputs are processed on this device. Sharing creates a URL only when you choose the share action.