Sample Size Calculators

for designing clinical research

Biostatistical Services

Please fill out the form below if you are looking for consultation for a sample size calculation, study design, data management, or statistical analysis. The request will go to sample-size.net developer Michael Kohn. Fees will depend on your organization and funding source.

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This project was supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through UCSF-CTSI Grant Numbers UL1 TR000004 and UL1 TR001872. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.


Please cite this site wherever used in published work:

Kohn MA, Senyak J. Sample Size Calculators [website]. UCSF CTSI. 11 January 2024. Available at https://www.sample-size.net/ [Accessed 05 May 2024]


Software utilities developed by Michael Kohn. Programming and site development by Josh Senyak at Quicksilver Consulting. Thanks to Mike Jarrett at quesgen.com for an early version of this site. Graphic design by Emanuel Heim Design.


This site was last updated on January 11, 2024.