There was a written formula that worked 80-odd % of the time. However, since all of us are on a computer, and I don't know who doesn't have their database on some geneaology program, I use this site. It even deals with the odd calender change for those of us going WAY back... Regards, Diane <A HREF="http://enws347.eas.asu.edu:8000/~buckner/bdform.html">Birthdate Calculator</A> <A HREF="http://enws347.eas.asu.edu:8000/~buckner/bdform.html">http://enws347. eas.asu.edu:8000/~buckner/bdform.html </A>