Descriptive statistics
Standard deviation calculator
Calculate population and sample standard deviation for five values.
How to use this calculator
Enter the five observations. The calculator reports their mean, population standard deviation and sample standard deviation.
Understanding the result
Standard deviation describes spread around the mean. A lower value means the observations cluster more closely around the mean; a higher value indicates greater dispersion. Population σ divides by n, while sample s divides by n − 1.
Common questions
What assumptions does this result use?
Exactly five equally weighted observations are used.
Are intermediate values rounded?
No. The calculation retains JavaScript number precision internally and formats only the displayed result unless the stated method requires a discrete whole value.