Standard Deviation
Calculate mean, variance, and standard deviation for a set of numbers — both population and sample.
How to Use the Standard Deviation
- 1
Enter your data
Input your numbers separated by commas or spaces.
- 2
Choose population or sample
Select whether your data is the full population or a sample.
- 3
View statistics
See mean, variance, standard deviation, and data summary.
💡 Tips & Tricks
- •Use sample SD when your data is a subset of a larger population (most real-world cases).
- •Outliers dramatically affect standard deviation — consider removing or investigating them.
- •SD is most meaningful for normally distributed data.
Frequently Asked Questions
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