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Statistics LibreTexts

11: Sample Size to Estimate a Population Mean

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  • Sample Size to Estimate a Population Mean 

    This calculator calculates the sample size needed to estimate a population mean. Please report the error to Dr. Jessica Kuang at

    To learn how to use this calculator, please watch a short video here.



    Fill in the population standard deviation (\(\sigma\)), the error bound (E), and the confidence level (CL).  Write the confidence level as a decimal.  For example, for a 95% confidence level, enter 0.95  for CL.  Then hit Calculate and assuming the population is normally distributed, the necessary sample size will be shown.

    Standard Deviation (\(\sigma\)):   Error Bound (E):   Confidence Level (enter a decimal):    



    Sample Size (n):  

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