Jewish Birthday Calculator
Convert your Gregorian birth date to find your Hebrew birthday according to the Jewish calendar. The Jewish calendar is a lunisolar system that differs from the Gregorian calendar, making your Hebrew birthday fall on different dates each year.
Calculate Your Hebrew Birthday
Your Hebrew Birthday Results
Hebrew Calendar Months
- Tishrei – First month, contains Rosh Hashanah and Yom Kippur
- Cheshvan – Second month, sometimes called Marcheshvan
- Kislev – Third month, contains Chanukah
- Tevet – Fourth month, continues Chanukah celebration
- Shevat – Fifth month, contains Tu BiShvat
- Adar – Sixth month, contains Purim (Adar II in leap years)
- Nissan – Seventh month, contains Passover
- Iyar – Eighth month, contains Lag BaOmer
- Sivan – Ninth month, contains Shavuot
- Tammuz – Tenth month, summer month
- Av – Eleventh month, contains Tisha B’Av
- Elul – Twelfth month, month of preparation
Hebrew Birthday Customs
- Personal Reflection – Time for spiritual self-examination and growth
- Increased Prayer – Many recite additional prayers or psalms
- Torah Study – Customary to increase learning on this day
- Charity Giving – Traditional to give tzedakah, often in multiples of 18
- Blessing Reception – Some seek blessings from rabbis or elders
- Special Foods – Eating new seasonal fruits with appropriate blessings
- Year Completion – Reviewing accomplishments of the past year
- Future Planning – Setting spiritual goals for the coming year
Calendar System Features
- Lunisolar Structure – Based on both moon phases and solar year
- Day Beginning – Each day starts at sunset, not midnight
- Month Length – Months alternate between 29 and 30 days
- Leap Year Cycle – Extra month added 7 times in 19 years
- Holiday Timing – Ensures holidays occur in proper seasons
- Ancient Origins – System dates back over 3,000 years
- Religious Significance – Used for all Jewish religious observances
- Modern Usage – Official calendar of Israel alongside Gregorian
Important Considerations
- Sunset Timing – Birth time affects the calculated Hebrew date
- Location Matters – Sunset times vary by geographic location
- Annual Variation – Hebrew birthdays occur on different Gregorian dates yearly
- Leap Year Impact – Extra month affects birthday calculations
- Religious Observance – Hebrew birthdays carry special spiritual significance
- Age Calculation – Jewish age is calculated from Hebrew birthday
- Lifecycle Events – Bar/Bat Mitzvah timing based on Hebrew age
- Memorial Dates – Yahrzeit observances follow Hebrew calendar
References
The Hebrew calendar calculations used in this converter are based on traditional Jewish law and established astronomical principles. Key references include:
Rambam (Maimonides). “Mishneh Torah, Hilchot Kiddush HaChodesh” – The foundational work on Jewish calendar calculations and astronomical principles.
Babylonian Talmud, Tractate Sanhedrin 10b-13b – Primary source for leap year calculations and calendar intercalation rules.
Shulchan Aruch, Orach Chaim 428-429 – Legal codes regarding calendar observance and date determination.
Responsa literature by Rabbi Moshe Feinstein and other leading halachic authorities on modern calendar questions.
Hebrew calendar data provided through established Jewish calendar APIs and verified against traditional sources.