Enter your data into a single column or row
Click an empty cell where you want the result to appear
Type `=STDEV.S(` for a sample standard deviation
Select the range of cells containing your data
Close the formula with `)`
Press `Enter`
Use `=STDEV.P(` if your data represents an entire population
Select the range of cells containing your data
Close the formula with `)`
Press `Enter`
Use `=STDEV.S(A1:A10)` as an example for a sample
Use `=STDEV.P(A1:A10)` as an example for a population
Use the `Data Analysis` ToolPak if you want a built-in analysis tool
Go to the `Data` tab
Click `Data Analysis`
Choose `Descriptive Statistics`
Select your input range
Check `Summary statistics`
Click `OK`