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.

Page researched & constructed by Deanna West

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:  Calculations may be 1-3 days off.  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 Labor Day?  Varying methods could have been used.   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. This formula page originally found on the Long Island Genealogy Site.

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