How this calculator works
Enter the values for first value, second value and review the units before calculating.
Formula / method
s = √(Σ(x − x̄)² ÷ (n − 1))
Worked example
For 10, 12 and 14, the sample standard deviation is 2.
Assumptions and limitations
The observations are a sample and are independent enough for this estimate.
Sampling bias, dependence and outliers can make this estimate misleading.