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Mean & Standard Deviation Calculator

Enter up to 12 values to calculate the mean and sample standard deviation (n−1). Empty boxes are ignored. Numbers only.

Count (n)
0
Mean
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Sample SD
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Read the guide

Enter values

Tip: Press Enter to calculate while typing.

Directions

  • Only numbers are allowed (you can use commas like 1,234.56).
  • Empty boxes are not included in the calculation.
  • Sample SD uses n − 1. If n < 2, SD is shown as 0.

Why this calculator?

Many calculators hide assumptions. StatsDesk makes it clear: this page computes sample standard deviation, which is the most common choice for sample data in classes and research. For population SD, see the guide in our blog.