Standard Deviation Calculator
Enter numbers to calculate population or sample standard deviation in your browser.
A QUICK WALKTHROUGH
How to use this tool
- Enter finite numbers separated by commas, spaces, or new lines.
- Choose population or sample standard deviation.
- Calculate and review the result.
Local numeric calculation
Inputs stay in your browser. Empty lists and non-finite values are rejected; sample standard deviation requires at least two values.
Choose the matching dataset
Use population mode when the list is the full population of interest. Use sample mode when the values are a sample and the n−1 divisor is appropriate.
GOOD TO KNOW
Common questions
Which divisor is used?
Population mode divides squared deviations by n; sample mode uses n−1.
How many values are needed?
Population mode accepts one or more finite values. Sample mode requires at least two.
Is my data uploaded?
No. The calculation runs locally in your browser.