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Standard Error of the Mean Calculator

SEM = sample SD ÷ √n.

Compute the standard error of the mean (SEM) — how precisely the sample mean estimates the population mean — from a list of observations.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

SEM = s / √n, where s is the sample standard deviation.

In depth

Compute the standard error of the mean (SEM) — how precisely the sample mean estimates the population mean — from a list of observations.