Birthdate Calculator

Birth Date Calculator


This calculator is very handy for genealogists.  The script calculates the birth date when the age at death and the date of death are know.  This is often the information recorded on older head stones.  Results are displayed in year-month-day format. All dates according to the Gregorian calendar, with New Year on Jan. 1.

Please make an entry in each box on lines 1 and 2.

When you have accomplished that, press the compute key located under the table and the answer will be calculated and displayed.  You may make changes and then press 'compute' again and the new answer will be displayed.



1.  You must enter a digit in each box.  Use a zero where you do not have a number to enter.
2.  Data entered - going across the page - is in Day/Month/YYYY format.
3.  For year of death an entry in each box is required. Specifically a zero in the box if nothing is known and make sure that you enter a four digit year where required - YYYY.
4.  To return to previous page use your browser 'Back' button.


Death Date Calculator
Item Day Month Year  
    1.   Date of Death 
    2.  Age at death in Days & Mos.  & Yrs




     3. Then person born on Day/Mo/Yr: 

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

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Last Updated 10/24/2002
Contact Dennis J. Cook at : djnsl@hotmail.com