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Jewish Calendar
Tools
Convert dates between Hebrew and Gregorian calendars, find your Hebrew birthday, calculate Bar/Bat Mitzvah dates, and determine yahrzeit memorial dates -- all free, no sign-up required.
Last updated: March 2026
The Hebrew (Jewish) calendar is a lunisolar system used to determine Jewish holidays, lifecycle events, and daily observances. Unlike the Gregorian calendar, Hebrew months follow the lunar cycle and years are adjusted with a leap month. These free tools let you instantly convert any date between the two systems, discover your Hebrew birthday, pinpoint a Bar or Bat Mitzvah celebration date, or find upcoming yahrzeit memorial dates for loved ones. Built by baba, the most accurate Hebrew translation app.
How Do I Calculate My Hebrew Birthday?
Find your Hebrew birthday and when it occurs next
How It Works
Three steps to any Hebrew calendar calculation
Choose a Calculator
Pick from Date Converter, Hebrew Birthday, Bar/Bat Mitzvah, or Yahrzeit calculator above.
Enter a Date
Select month, day, and year using the visual date picker or type in a Hebrew date directly.
Get Instant Results
See the converted date, upcoming celebrations, or memorial dates displayed immediately.
Understanding the Hebrew Calendar
A Lunisolar System
The Hebrew calendar combines lunar months with solar-year adjustments. Each month begins at the new moon (Rosh Chodesh), giving months a length of 29 or 30 days. Because 12 lunar months fall about 11 days short of a solar year, a 13th month (Adar II) is added seven times in every 19-year Metonic cycle. This keeps holidays like Passover in spring and Sukkot in autumn.
Days Begin at Sunset
A Hebrew day starts at sunset, not midnight. Shabbat begins Friday evening and ends Saturday night. Holidays follow the same pattern -- Yom Kippur starts the evening of 9 Tishrei and ends the evening of 10 Tishrei. This is why Jewish observances always feel like they start "the night before" on the Gregorian calendar.
Lifecycle Events on the Hebrew Calendar
Major Jewish lifecycle events are calculated on the Hebrew calendar. A boy becomes Bar Mitzvah at age 13 in Hebrew years; a girl becomes Bat Mitzvah at 12. Hebrew birthdays are observed on the same Hebrew date each year, which shifts on the Gregorian calendar. Yahrzeits (memorial anniversaries) also follow the Hebrew date of passing, ensuring the observance stays true to tradition regardless of the Gregorian date.
Key Facts
The Hebrew calendar has been in continuous use for over 2,000 years.
Hebrew years are counted from the traditional date of creation (Anno Mundi) -- the current year is 5786.
There are 12 months in a regular year and 13 in a leap year (7 leap years per 19-year cycle).
Rosh Hashanah (Jewish New Year) falls on 1 Tishrei, typically in September or October.
The Hebrew calendar determines the dates of all Jewish holidays, fasts, and Torah readings.
Frequently Asked Questions
Everything you need to know about Hebrew dates and Jewish calendar calculations
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