Hebrew Calendar Converter

The Hebrew calendar (also known as the Jewish calendar) is a lunisolar calendar used for Jewish religious observances and cultural purposes. Unlike the Gregorian calendar, which is purely solar, the Hebrew calendar tracks both the moon's cycles and the sun's seasonal cycle. This dual tracking ensures that Jewish holidays, which are tied to specific agricultural seasons, always fall in the correct time of year.

The Hebrew calendar counts years from the creation of the world, which according to Jewish tradition occurred in 3761 BCE. The current Hebrew year (as of 2024-2025) is 5785. The calendar year begins in the fall with Rosh Hashanah (Jewish New Year), typically in September or October, and the months count from Nisan (month 1) in the spring.

The Hebrew calendar has 12 regular months in common years and 13 months in leap years. The months alternate between 29 and 30 days, with the exception of Cheshvan and Kislev, which can be 29 or 30 days depending on the year. A regular Hebrew year has 353-355 days, while a leap year has 383-385 days.

This converter provides approximate Hebrew dates for Gregorian calendar inputs, along with a reference of Hebrew months and major Jewish holidays.

The Hebrew calendar follows a complex 19-year Metonic cycle that intercalates 7 leap years in every 19 years to keep the lunar months aligned with the solar seasons. A year is a leap year if the remainder of (7 × year + 1) divided by 19 is less than 7.

The simplified approximation used by this calculator calculates the Hebrew year as: Hebrew Year = Gregorian Year + 3,760. This approximation works because the Hebrew year begins in the fall, so for Gregorian dates in January through August, the Hebrew year is approximately Gregorian + 3,760. For dates in September through December, the Hebrew year is approximately Gregorian + 3,761.

The Hebrew months, in order from the beginning of the year (Rosh Hashanah), are: Tishrei (7), Cheshvan (8), Kislev (9), Tevet (10), Shevat (11), Adar (12), Nisan (1), Iyar (2), Sivan (3), Tammuz (4), Av (5), Elul (6). Note that the months are numbered starting from Nisan, but the year begins with Tishrei.

This Hebrew calendar converter provides a simple interface for approximate date conversion:

1. Enter the Gregorian Year: Type the year in the Gregorian calendar into the first field. For example, enter 2024 for the current year.
2. Select the Month: Choose the Gregorian month from the dropdown menu (January through December).
3. Enter the Day: Type the day of the month (1-31) into the third field.
4. View the Hebrew Date: The calculator displays the approximate Hebrew year and the Hebrew month range, along with the original Gregorian date for reference.

The Hebrew months table shows all 13 months with their day counts and approximate Gregorian equivalents. The Jewish holidays table shows major holidays with their Hebrew and Gregorian dates.

Note that this conversion is approximate. For exact Hebrew dates, use a dedicated Hebrew calendar algorithm that accounts for the full complexity of the Metonic cycle and the variable lengths of Cheshvan and Kislev.

The converter displays the Hebrew year and an approximate Hebrew month range. The Hebrew year is calculated as Gregorian year + 3,760 (or + 3,761 for fall/winter dates). The month range provides an approximate correspondence based on the Gregorian month.

The Hebrew months table provides the complete list of months with their day counts and Gregorian equivalents. Some months have variable lengths: Cheshvan can be 29 or 30 days, and Kislev can be 29 or 30 days, depending on the year.

The Jewish holidays table shows major holidays for 2024-2025, with both their Hebrew and Gregorian dates. Remember that Hebrew days begin at sunset, so holidays start the evening before the Gregorian date shown.

Religious observance is the primary application of the Hebrew calendar. Jewish holidays—including Rosh Hashanah, Yom Kippur, Passover, Sukkot, Hanukkah, and Purim—follow the Hebrew calendar. Converting to Gregorian dates helps Jews and non-Jews plan for these holidays.

Interfaith and multicultural planning requires understanding Hebrew dates when scheduling events, programs, or observances that may coincide with Jewish holidays. Schools, businesses, and organizations benefit from knowing when major Jewish holidays fall in the Gregorian calendar.

Historical and genealogical research often involves Hebrew dates found in Jewish records, including birth certificates, marriage contracts, tombstones, and historical documents. Converting these to Gregorian dates helps researchers place events in historical context.

Academic study of Jewish history, religion, and culture requires understanding the Hebrew calendar system. The calendar's unique lunisolar structure provides insights into the intersection of astronomy, agriculture, and religious practice in ancient and modern Judaism.