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Sample size for a Confidence interval of a single mean

Confidence interval
Confidence Interval (%):  
Input
Standard deviation: 
Confidence interval width (2-sided): 
Results
Minimum required sample size:

For details, see the MedCalc manual: Confidence interval sample size: Single mean.

How to cite this page

  • MedCalc Software Ltd. Sample size for a Confidence interval of a single mean. https://www.medcalc.org/en/calc/sample-size-ci-single-mean.php (Version 23.4.8; accessed February 11, 2026)

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https://www.medcalc.org/en/calc/sample-size-ci-single-mean.php

© 2026 MedCalc Software Ltd