JOS Tools
A set of free calculators for Jewish genealogical research: convert dates between the civil and Hebrew calendars, look up Jewish festival dates for any year, generate Soundex codes for surnames, and translate Jewish years between numerals and Hebrew letters.
Calendar Converter
Convert a civil (Gregorian) date to the Hebrew calendar or back, and list Yahrzeit dates across consecutive years.
Open converter →Festival Dates
Display every Jewish holiday for any year you choose — entered as either a civil year or a Hebrew year.
Show festivals →Soundex Calculator
Generate NARA (Russell) and Daitch-Mokotoff Soundex codes for a surname to find spelling variants in indexes.
Calculate codes →Hebrew Year Converter
Translate a Jewish year between Arabic numerals and Hebrew letters, and see whether it is a leap year.
Convert year →