Enter a birth date and get the Hebrew date, the bar or bat mitzvah date, the parsha of that week, and the next 20 Hebrew birthdays as a calendar file, plus a card to share.
Enter a birth date
The Hebrew birthday, the bar or bat mitzvah date, the parsha and the next 20 years will appear here.
Free, no sign-upAfter-sunset rule built inAdar and 30th-of-month cases flaggedShareable card
What you get
More than a date.
The Hebrew date
In English and Hebrew letters, with the after-sunset rule applied.
Bar/bat mitzvah
The 13th or 12th Hebrew birthday and the English day it falls on, years ahead.
The parsha
The Torah portion read the Shabbat after the birth, a traditional choice for a bar mitzvah to learn.
A card to share
A navy-and-gold image with the Hebrew date, for the family group chat.
The calendar in numbers
Why your Hebrew birthday moves.
Hebrew months follow the moon, so the year is shorter than the English one, and a 13th month is added seven times every nineteen years to catch up.
- months in a year
- or 13
- years are leap years, with two Adars
- in 19
- in a typical common year, about 11 fewer than the English year
- days
- bar and bat mitzvah ages in Orthodox communities
- / 12
Planning a simcha
From date to celebration.
Find the Hebrew birthday
Including the after-sunset case; it changes the date for babies born in the evening.
Mark the 13th or 12th
That's the halachic date. Most synagogues set the celebration on the following Shabbat; some on the day itself if it's a Monday or Thursday.
Add it to the calendar
The .ics file puts every Hebrew birthday for 20 years in your phone, so the simcha date is never a surprise.
The tricky dates
Flagged, explained, and sent to your rabbi.
Some birth dates don't exist every year. The calculator says what it did and why, with its sources, and leaves the final word for the bar or bat mitzvah to your rabbi.
Guides
Everything around the date.
Also from this family
Yahrzeit dates, the same way.
Ten years of yahrzeit dates with a calendar file and a printable card for the shul office, powered by the same Hebcal engine.
- Private
- Nothing is stored or sent to us. Only the birth date goes to Hebcal for the calculation.
- Checked against Hebcal and Chabad.org
- Ten test dates, including leap years and after-sunset cases.
Questions
How is a Hebrew birthday worked out?
Your English birth date is converted to the Hebrew calendar date. Each year, your Hebrew birthday is that same Hebrew date, which lands on a different English date.
Why does 'after sunset' matter?
The Hebrew day starts at nightfall. A baby born after sunset has the next day's Hebrew date.
How is the bar or bat mitzvah date calculated?
A boy becomes bar mitzvah on his 13th Hebrew birthday, a girl bat mitzvah on her 12th. The calculator finds that Hebrew date and shows the English date it falls on. The celebration is often moved to the nearest Shabbat; your synagogue decides.
What about Adar in a leap year?
Leap years have Adar I and Adar II. For someone born in a regular year's Adar, the calculator follows Hebcal and uses Adar II, as Chabad.org's summary of the laws of bar mitzvah does; some authorities hold Adar I. The result flags it. Confirm the bar or bat mitzvah date with your rabbi.
What if I was born on the 30th of a month?
Cheshvan and Kislev have a 30th day only in some years, and Adar I only exists in leap years. In years without the date, the 20-year list moves the birthday to the 1st of the next month (Hebcal's rule). The result shows a note, and for the bar or bat mitzvah date you should confirm with your rabbi.
Who does the calendar math?
Hebcal, the open Jewish calendar service. This site adds the bar/bat mitzvah date, the parsha, the 20-year list, the calendar file and the shareable card.
