Standard Error: SD = 10, n = 100
With standard deviation 10 and sample size 100, the standard error of the mean is exactly 1.0.
How to use this tool
- Enter standard deviation (s) and sample size (n) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your standard error (se) and the full breakdown beneath it.
Calculate the standard error of the mean for a sample of 100 with standard deviation 10, a clean and commonly used example.
Frequently asked questions
- What is the difference between standard deviation and standard error?
- Standard deviation (SD) describes the variability of individual data points around their mean. Standard error (SE) describes the variability of the sample mean itself — it shrinks as sample size grows: SE = SD / √n.