Long Island Genealogy
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Birth Date Calculator

This calculator is a useful tool for genealogists. It is designed to calculate the birth date when the age at death and the date of death are the only facts known. As we all know this is often the only information recorded on older headstones.

Please make entries in each box on lines 1 and 2
Use a zero where you do not have a number to enter
Item Day Month Year
Date of Death 
Age at death in Days - Months - Years
Calculated Birth Date Will Appear Here - Day - Month - Year:

To perform your calculation enter data on both lines 1 and 2 
then press this button

Note regarding Birth Date Calculator:  While doing some testing on this with 30+ death certificates already containing a birth date, death date, and age, I have found it to be only 39% accurate.  It was 1-3 days off 38.5% of the time and more than 3 days the remaining 22.5%.  No one really knows exactly how stonecutter's figured the age of the person.  Did they use a formula, count off the days between birth and death, did they figure in Leap year?  Varying methods could have been used.  A friend has a different method of calculating a birth date and running the same test, found it to be only 22.5% accurate!  These methods work ok for approximate birth dates, but it should be understood that these date's are most likely not correct.  In running a several step process from when the stonecutter first figures the age from the birth date and carves the date on the stone and then someone tries to do just the opposite, there is lots of room to make errors along the way.
Tony Bengston


"Genealogy Education Resources"
     There are many different types of educational degrees available that can help you break into the world of genealogy. Tracing back the history around different cities is important as you will find much information about the individuals who participated in the construction of these cities. A masters degree in engineering management online can help you become on of those city builders. And the legal field is also important, and it documents much information pertaining to certain individuals who were affected state and federal law. A master of law degree online is one of those types of programs, as you will be educated on the field of law and the history that goes along with it. by brock fleming