Skip to main content

Sample size for a Confidence interval of a single proportion

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

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

How to cite this page

  • MedCalc Software Ltd. Sample size calculator for a Confidence interval of a single proportion | MedCalc. https://www.medcalc.org/en/calc/sample-size-ci-single-proportion.php (Version 23.6.2; accessed July 16, 2026)
Trusted by researchers worldwide — download the full MedCalc statistical software and perform advanced statistical analysis in seconds. No registration required.

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

© 2026 MedCalc Software Ltd