Age at Death Calculator

Enter the dates of birth and death to get the exact age at death, or work out a birth date from the age on a gravestone. For a living person's age, use the age calculator.

Calculate
Date of birth

Date of death

Age at death

e.g. born Mar 10, 1808, died Jun 15, 1880 → 72 years, 3 months, 5 days

The result appears here as you type.

Calculated in your browser. The dates you enter never leave this device.

Related calculators

Age at death from two dates

The calculator counts from the date of birth to the date of death: full years, then full months, then the days left over, plus the total number of days.

Example: born March 10, 1808, died June 15, 1880: 72 years, 3 months, 5 days, or 26,395 days.

A birth date from a gravestone

Many headstones and death records give the age at death instead of the date of birth, as in “aged 72 years, 3 months and 5 days”. Choose Birth date from age, enter the date of death and that age, and the calculator works backwards to the date of birth.

Treat the result as “on or about”. Ages on old records were often worked out by hand with 30-day months, so the true date can be a day or two away. A birth or baptism record is the best way to confirm it. The What Day Was I Born? page shows the weekday of any date.

Old calendars

Britain and its colonies switched from the Julian to the Gregorian calendar in September 1752; most of Catholic Europe switched in 1582, and some countries much later. Dates recorded before the switch can be 6 to 13 days off from the Gregorian dates used here, depending on the century and the country, and in Britain the year sometimes started on March 25. The calculator flags dates before 1752 so you can check the source.

Frequently asked questions

How do I find someone's age at death?

Enter the date of birth and the date of death. The calculator counts full years, then full months, then the remaining days, and shows the total in days.

How do I work out a birth date from a gravestone?

Choose Birth date from age, then enter the date of death and the age carved on the stone (for example 72 years, 3 months, 5 days). The calculator works backwards to the date of birth.

Why might the birth date be a day or two off?

Ages on old records were often worked out by hand with 30-day months, and real months are 28 to 31 days long. Treat the result as “on or about” that date and look for a birth or baptism record to confirm it.

Does it handle dates before 1752?

Yes, back to the year 1000, in the Gregorian calendar. Britain and its colonies switched from the Julian calendar in 1752 and most of Catholic Europe in 1582, so older records can be 6 to 13 days off from the dates used here, depending on the century and the country.