Birth and Death Date Calculators

Online Birth Calculators

• Date Calculator: Add to or Subtract From a Date at Timeanddate.com - can be used for calculating birth from tombstones or determining exact age of a person from birth date
• Birth Date Calculator at longislandgenealogy.com - used to help you calculate birth date when the tombstone only gives the date of death and the exact age
• Tombstone Birthday Calculator at searchforancestors.com - used to help you calculate birth date when the tombstone only gives the date of death and the exact age
• Ancestor Search Age Calculator at searchforancestors.com - used when you want to know how the exact age of a person from a birth date
• Age Calculator at Rootsweb - has various calculators to determine birth date and age

Calculating Birth Dates

Having birth dates for our ancestors helps us confirm our finds, as well as better identify them in other records. However, finding precise birth dates can be much more difficult as we research further back in time. We may only have our ancestor’s age (sometimes in the format of years/months/days) at time of death, or our ancestor’s age in another document. We may wish to know how old an ancestor would be from their birth date. Using a Date Calculator can help us with the addition and subtraction necessary to discover our a more precise date. The date calculators listed above can help you determine that information.

Records that may give an exact age at death and a death date can be found on:

Death records Grave markers (typically older markers)

Church records Obituaries

How it works

The way to use it is to put in the date of death. Subtract the number of Years, Months, and Days, then push the calculate button. The answer is under the lower left corner under the colored box. If for some reason you have the Date of Birth and have the number of Years, Months, and Days when died you would put in Add then calculate the date of death.