Free statistical calculators

Sample size for Single mean

Input
Type I error - Alpha:
Type II error - Beta:

Mean:
Standard deviation:
Null hypothesis value:
Result
Minimum required sample size:

For details, see the MedCalc manual: Sample size: Single mean.

MedCalc Software Ltd. Sample size for Single mean. https://www.medcalc.org/en/calc/sample-size-single-mean.php (Version 23.4.8; accessed January 23, 2026)