In a message dated 97-10-16 11:34:19 EDT, Jeff R wrote: This is *almost* off topic, and I've seen it discussed in alternate forums, but never with a straightforward answer: does anybody have a cheap (okay, maybe free) site/calculator they know of for using death date & age to back into birthdate? Here is a list of sites that may be of assistance: Calculating Birth Year Calculating Birth Year Based on Census Information  http://www.usit.net/tngenweb/census/cenindx.htm Birthdate Form Calculates birthdate from death date and age of death in year-month-day format. http://enws347.eas.asu.edu:8000/~buckner/bdform.html Calculation of the Ecclesiastical Calendar http://cssa.stanford.edu/~marcos/ec-cal.html DETERMINING DATE OF BIRTH Determining Date Of Birth - "Formula 8870"  http://www.rootsweb.com/~hcpd/formula.htm And a more complete list of various dating and chronology systems may be found at: Cyndi's List of Genealogy Sites on the Internet Calendars & Dates http://www.oz.net/~cyndihow/calendar.htm Dennis