Every name has a place. Work out which one.
Cousin relationships, shared DNA in centimorgans, Soundex codes, Ahnentafel numbers, Old Style and New Style dates, and generations, worked out the way a family historian does. Every calculation runs in your browser.
Cousin Relationship Calculator
Name the relationship between two people from how many generations each is from a shared ancestor, including cousin degree, removal and half relationships.
Open → ≈ 850 cMShared DNA (cM) Calculator
Estimate which relationships fit a shared centimorgan figure from a DNA match, or see the expected shared DNA for a relationship.
Open → A261Soundex Code Calculator
Code a surname in American Soundex, the phonetic index used by US census and immigration records, and check whether two spellings are filed together.
Open → No. 13Ahnentafel Number Calculator
Turn an Ahnentafel ancestor number into the path back from the subject, and a path such as mother’s father’s mother back into its number.
Open → 11 Feb 1731/32Julian–Gregorian Calendar Converter
Convert dates between the Julian (Old Style) and Gregorian (New Style) calendars, with the weekday, Julian Day Number and Old Style double dating.
Open → 8 generationsGeneration Calculator
Estimate how many generations separate two birth years, how many ancestors that generation holds and how much DNA a single ancestor that far back is expected to pass down.
Open →DNA figures are averages and several relationships share each one; calendars and spellings varied by place and time. Treat every result as a lead to check against original records, and respect the privacy of living relatives.