Is the Bar/Bat Mitzvah date based on the Gregorian or Hebrew birthday?

The Hebrew-calendar anniversary of the birth date, not the Gregorian one — which is why this tool converts the birth date to Hebrew first.

Does the celebration have to happen on the exact date?

No — many families hold the celebration on the nearest Shabbat with a Torah reading (or another convenient date), rather than the exact weekday the halakhic date falls on.

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Bar/Bat Mitzvah Date Calculator

The Hebrew-calendar date a child reaches Bar or Bat Mitzvah age.

🔒 Runs entirely in your browser — nothing here is ever uploaded

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About the Bar/Bat Mitzvah Date Calculator

Computes the Hebrew-calendar date a child reaches Bar Mitzvah (boy, age 13) or Bat Mitzvah (girl, age 12) age, from their Gregorian birth date.

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How to use it

Enter the child's Gregorian date of birth.
Select gender.
Read the Hebrew date of birth and the Bar/Bat Mitzvah date.

Formula

Converts the birth date to its Hebrew-calendar date, then finds the same Hebrew month/day in the Hebrew year that is birth year + 13 (boy) or + 12 (girl).

Worked example

A boy born January 1, 2013 (19 Tevet 5773) reaches Bar Mitzvah age on the Hebrew date matching 19 Tevet 5786.

Interpreting your result

A real, disclosed edge case: a child born in Adar I of a Hebrew leap year doesn't have a clean single answer if the target year isn't also a leap year (since Adar I doesn't exist then) — more than one convention exists for which date to use; this calculator doesn't resolve that dispute.

Recommendations

• Many families hold the celebration on the nearest Shabbat with a Torah reading rather than the exact weekday of the halakhic date — this calculator gives the halakhic date itself, not a suggested celebration date.

Frequently asked questions

This is the classical halakhic age of religious majority — 12 for girls, 13 for boys — at which point a child becomes obligated in the commandments (mitzvot).