Enter your data in a single column
Click an empty cell where you want the result
Use `=STDEV.S(range)` for a sample standard deviation
Use `=STDEV.P(range)` for a population standard deviation
Replace `range` with your cell range, such as `A1:A10`
Press Enter
To calculate by menu, go to the Data tab
Click Data Analysis
Select Descriptive Statistics
Choose your input range
Check Summary statistics
Click OK
Read the standard deviation result in the output