Standard Error Calculator

Use a sample standard deviation and size, a proportion and size, or paste raw data to calculate standard error.

Mode

Sample SD (s)

Sample size (n)

—Standard error

—SD / proportion SD

—n

—Approx. 95% margin

—Standard error estimates sampling variability.

How to use this Standard Error Calculator

Calculate standard error for a mean, proportion, or raw sample. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.