Standard Error Calculator
Calculate the standard error of the mean using sample standard deviation and sample size.
Formula:
SE = s / √n
Result will appear here.
| Metric | Value |
|---|
Privacy: calculations run locally in your browser. No inputs are stored or transmitted.
How it works
Standard error of the mean decreases as sample size increases, assuming the sample standard deviation stays the same.
Examples
- s = 12, n = 100 → SE = 1.2
- s = 8, n = 25 → SE = 1.6
FAQ
- What is standard error?
Standard error measures the typical sampling variability of a statistic such as the sample mean.
- What formula does this calculator use?
It uses standard error of the mean: SE = s / √n.
- Why must sample size be greater than 0?
Because the formula divides by the square root of sample size.
- Can standard deviation be 0?
Yes. If standard deviation is 0, the standard error is also 0.
- Are calculations stored?
No. Everything runs locally in your browser.