Standard Deviation Calculator
Calculate population and sample standard deviation, variance, mean, and range. Enter numbers separated by commas or spaces.
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Count
7
Mean
21.00
Sum
147.00
Range
18.00
Population Std Dev (σ)
6.0000
Variance: 36.0000
Sample Std Dev (s)
6.4807
Variance: 42.0000
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Frequently Asked Questions
What is the difference between population and sample?
Use population standard deviation when your data includes every member of the group. Use sample standard deviation when your data is a subset of a larger population.
What does standard deviation tell you?
Standard deviation measures how spread out numbers are from the mean. A low standard deviation means values are close to the mean; a high standard deviation means they are spread out over a wider range.