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As you know, the Standard Error = Standard deviation / square root of total number of samples, therefore we can translate it to Excel formula as Standard Error = STDEV(sampling range)/SQRT(COUNT(sampling range)).

For example, your sampling range is paced in the Range B1:G4 as below screenshot shown. You can select the cell you will place the calculated result, type the formula =STDEV(B1:G4)/SQRT(COUNT(B1:G4)), and press the Enter key. See screenshot:

Now you can get the standard error of mean as below screenshot shown:

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