Standard Error of the Mean Calculator

Calculate the standard error of the mean and the 95 percent margin of error from a sample standard deviation and size

Frequently Asked Questions

What is the difference between standard error and standard deviation?

Standard deviation measures the spread of individual values, while standard error measures how precisely the sample mean estimates the true mean.

How do I shrink the standard error?

Because it divides by the square root of the sample size, you must quadruple the sample to cut the standard error in half.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.