Cousin Relationship Calculator

First identify the shared ancestor. Then select how each person is related to that ancestor. The calculator will instantly determine the cousin relationship.

Person 1 Relationship

Person 2 Relationship

Your result will appear here.

This calculator determines cousin relationships based on how many generations each person is removed from a shared ancestor.

Kenneth R Marks was born and educated in the San Francisco Bay Area, receiving a BS in Mathematics in 1968. His career was in Information Technology; with the last 20 Years as a software executive with Boeing, Pearson, and NASA. His genealogy career began in 2004. He is an expert in newspaper research for genealogy, as well as additional genealogy topics. He regularly conducts webinars on the subject and has authored four genealogy books. See the About page for more details.

The Ancestor Hunt, founded in 2008, is focused on helping genealogy and family history researchers of all skill levels to achieve their goals, by providing links to free online genealogy collections, and search tips and techniques, largely via easy-to-understand Quick Reference Guides.