How to Use the Birth Date Calculator
Select the Add or Subtract option in the calculator below.
Enter the date of the known event, such as an ancestor’s death or marriage.
Select Subtract, then enter the person’s age at that event in the Years, Months, and Days fields.
The calculator will subtract that amount of time from the event date and display the calculated birth date.
Example: If an ancestor died on June 15, 1900, at the age of 65 years, 3 months, and 10 days, subtracting that age from the death date produces a calculated birth date of March 5, 1835.
Genealogy Tip: Death certificates, obituaries, cemetery records, and other historical documents sometimes provide an age in years, months, and days rather than a birth date. Use this calculator to work backward from the event date. Remember that the calculated birth date is only as accurate as the age recorded in the original source.
Date Calculator by SureCalcs
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