Genealogy Calculators
Free calculators for the math old records leave you with: birth dates from gravestone ages, cousin relationships, Soundex codes, old calendar dates and census ages.
Tombstone Calculator
Work out a birth date from a death date and an age like "63 years, 4 months, 12 days," as found on gravestones and death records.
Relationship Calculator
Work out second cousins, first cousins once removed and every other relationship, with the average amount of DNA you'd share.
Soundex Calculator
Get the American Soundex code for any surname, used to index the 1880 to 1930 censuses and many other records.
Date Converter
Convert Old Style (Julian) dates to New Style (Gregorian), decode double dates like 1731/32, and read Quaker dates like "5th day of 3rd month."
Census Age Calculator
Combine the ages your ancestor gave in different censuses to narrow down the birth date range.
More tools
Research planner: what should I search? · The Reference Shelf · Free printable forms