Convert a Gregorian birth date to its Hebrew birthday and find the upcoming Gregorian date, day of week, observances, and astrological associations.

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Hebrew dates begin at sunset. Select whether birth was after sunset. Anniversaries use the Hebcal birthday convention; customs can differ. Gregorian results show the daytime date.

Reference date

Leave blank to use today on this device.

Hebrew Birthday Formula

The following equation is used to convert a Gregorian birth date to a Hebrew birthday.

HBD = f(GBD)
  • Where HBD is the Hebrew Birthday
  • GBD is the Gregorian Birth Date
  • f(GBD) is the conversion function provided by the Hebrew calendar system

Enter your local Gregorian birth date and whether birth was after sunset. The calculator converts on this device and applies the Hebcal birthday convention to the next anniversary.

What is a Hebrew Birthday Calculator?

Definition:

A Hebrew Birthday Calculator converts your Gregorian birth date into the corresponding Hebrew birthday and provides additional details such as the upcoming Hebrew birthday (in Gregorian), the day of the week, special observances, and astrological associations.

How to Calculate Your Hebrew Birthday?

Example Problem:

The following example outlines the steps and information needed to calculate your Hebrew birthday.

First, enter your Gregorian birth date. For example, enter May 15, 1990.

Next, the calculator converts your birth date to determine your Hebrew birthday, including details like the day of the week, special observances, and astrological associations.

Finally, the upcoming Hebrew birthday is calculated based on the current date using the conversion function.

HBD = f(GBD)

HBD = 20 Iyyar 5750 (before sunset)

For reference date January 1, 2026, the upcoming daytime birthday is May 7, 2026 (20 Iyyar 5786).

FAQ

How does the Hebrew Birthday Calculator work?

The calculator uses the browser’s Hebrew calendar support for conversion and the Hebcal birthday convention for anniversaries. Results include the next daytime Gregorian date, weekdays, month-level observance context and cultural associations. Month context does not establish a holiday on the birthday.

Why do the Hebrew and Gregorian birthdays differ?

The Hebrew calendar is lunisolar, so its dates do not align exactly with the Gregorian calendar. This means that your Hebrew birthday can fall on a different Gregorian date each year.

Can the calculator handle leap years and special cases in the Hebrew calendar?

The calculator handles Hebrew leap years, Adar mappings and missing day 30 using the Hebcal birthday convention. Customs differ, including whether ordinary-year Adar births are celebrated in both Adars. Confirm local sunset and your family’s practice.