Standard Deviation Calculator
Variance = Σ(x − mean)² / (n − 1) for a sample, or / n for the population.
Inputs and units
- Numbers: Enter your value in the format and unit shown.
- Mode: Choose Sample (n − 1), Population (n).
Calculation method
Variance = Σ(x − mean)² / (n − 1) for a sample, or / n for the population.
Worked example
The example values are: Numbers = 2,4,4,4,5,5,7,9; Mode = sample
- Count: 8
- Mean: 5
- Variance: 4.5714285714
- Standard deviation: 2.1380899353
Assumptions and limitations
Check that the inputs and units describe your situation.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Standard Deviation Calculator FAQs
What method does this calculator use?
Variance = Σ(x − mean)² / (n − 1) for a sample, or / n for the population.
What should I check before using the result?
Check that the inputs and units describe your situation.