Standard Deviation Calculator
See how spread out your data is. Enter a list of numbers to get the mean, variance and standard deviation.
How it works
- 1
Enter your numbers
Separate them with commas, spaces or new lines.
- 2
Choose population or sample
Population if you have all the data, sample if it is a subset.
- 3
Read the results
Mean, variance and standard deviation.
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Frequently asked questions
Population when your numbers are the entire group you care about; sample when they represent a subset used to estimate a larger group.
What standard deviation measures
Standard deviation shows how far values typically sit from the mean. A low standard deviation means values cluster tightly; a high one means they are spread out.
Population standard deviation divides by n (the count); sample standard deviation divides by n − 1, which corrects for the bias of estimating from a subset of a larger group. Use sample when your data is a sample, population when it is the entire group.