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Birth date Calculator

Many old tombstones show the date of death and the age of the deceased in years, months, and days. This calculator simplifies the task of determining the date of birth from that information.

All dates are according to the Gregorian calendar with the year beginning on January first.

Enter date of death and age at death:

Day/s Month/s Year/s
Date of Death:
Age at Death:
Date Born
To perform your calculation, press this button:

Note: you must enter a value for all three fields of Age at Death.