Free statistical calculators

Sample size for Single proportion

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

Proportion (%):
Null hypothesis value (%):
Result
Minimum required sample size:

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

MedCalc Software Ltd. Sample size for Single proportion. https://www.medcalc.org/en/calc/sample-size-single-proportion.php (Version 23.4.8; accessed February 11, 2026)