Bat Mitzvah Date Calculator

Discover the Gregorian date of the 12th Hebrew birthday and the corresponding weekly Torah portion (Parashat HaShavua). This milestone marks a significant step in Jewish life.

Enter the Gregorian (civil calendar) birth details below and click “Calculate Date”

Birth Information
Gregorian Birth Date:
Note: Calculations use the Hebcal JavaScript API. Ensure your browser has JavaScript enabled.

Understanding Your Bat Mitzvah Date

A girl traditionally becomes a Bat Mitzvah on her 12th birthday according to the Hebrew calendar. Since the Hebrew day begins at sunset, if the birth occurred after sunset on a particular Gregorian date, the Hebrew birthday falls on the following Hebrew day.

This calculator determines this significant date and also identifies the Parashat HaShavua (weekly Torah portion) that will be read in synagogue on the Shabbat associated with the Bat Mitzvah date. This portion often becomes a central theme for the Bat Mitzvah’s D’var Torah (speech).

How it Works:

• Gregorian to Hebrew: Your civil birth date is converted to its Hebrew calendar equivalent. The “after sunset” option adjusts this if necessary.
• Adding 12 Years: Twelve years are added to the Hebrew birth date.
• Hebrew to Gregorian: The resulting 12th Hebrew birthday is converted back to the Gregorian calendar date.
• Parashah Identification: The calculator finds the Torah portion for the Shabbat of the week of the 12th Hebrew birthday.

This tool provides a reliable calculation for planning and understanding this important lifecycle event. Consult with your rabbi or community for specific customs and scheduling.

Learn More About Bat Mitzvah

Bat Mitzvah 101 (My Jewish Learning) What Is a Bat Mitzvah? (Chabad.org) What is a Parsha? (Hebcal) Hebrew Date Converter (Hebcal)