Standard Deviation Calculator
Calculate the sample and population standard deviation and variance of a data set, with the mean and the steps shown.
Result
Sample standard deviation (s)
2.13809
- Population standard deviation (σ)
- 2
- Sample variance (s²)
- 4.571429
- Population variance (σ²)
- 4
- Mean
- 5
- Count
- 8
- Sum of squared differences
- 32
Common questions
Should I use the sample or population standard deviation?
Use the population version (divide by n) when your numbers are the whole group. Use the sample version (divide by n − 1) when they are a sample from a bigger group, which is the usual case.