Jewish Birthday Calculator

The Jewish calendar and the Gregorian calendar are two entirely different systems — one is lunisolar, the other solar — which means your birthday on the Hebrew calendar falls on a completely different date than the one on your standard calendar, and it shifts relative to the Gregorian calendar every year. For Jewish individuals, knowing your Hebrew birthday is more than a curiosity. It’s the date that marks religiously and culturally significant milestones — Bar and Bat Mitzvahs are celebrated on the Hebrew birthday, Yahrzeits (the anniversary of a loved one’s passing) are observed on the Hebrew date, and many Jewish lifecycle events are tied to the Hebrew calendar rather than the Gregorian one.

This Jewish Birthday Calculator makes the conversion effortless. You enter your Gregorian birthdate — the date you use every day — and the tool instantly converts it to its Hebrew calendar equivalent using the Hebcal API, one of the most trusted and accurate Hebrew calendar conversion services available. The result is displayed in both English transliteration (for example, “25 Tishrei 5784”) and Hebrew script, so the output is useful whether you’re sharing it with family, discussing it with a rabbi, or using it to plan a milestone event.

How the Conversion Works

The Hebrew calendar is a lunisolar calendar — it tracks months by the lunar cycle but adjusts periodically with leap months to stay aligned with the solar year. A standard Hebrew year has 12 months, but a leap year (which occurs 7 times in every 19-year cycle) has 13 months, with an extra month called Adar I inserted before the regular Adar. This means the Hebrew calendar doesn’t map cleanly onto the Gregorian calendar — a given Hebrew date can fall anywhere within a range of Gregorian dates depending on the year.

Because of this complexity, direct manual calculation of a Hebrew date from a Gregorian date is not straightforward. The tool uses the Hebcal API to perform the conversion accurately, handling all the intricacies of the lunisolar system — including leap year adjustments, month length variations, and the alignment between the two calendars — behind the scenes. The result is always precise and correctly reflects the Hebrew date corresponding to your Gregorian birthdate.

The Hebrew year count (Anno Mundi) is also different from the Gregorian year count — it counts years from the traditional Jewish date of creation. The year 2025 in the Gregorian calendar corresponds approximately to the Hebrew year 5785–5786.

How to Use It

The conversion takes just seconds:

1. Select your Birthdate using the date picker — enter the day, month, and year of your Gregorian birthdate
2. Click Calculate
3. View your Jewish birthday displayed in English (e.g., “25 Tishrei 5784”) and in Hebrew script

Why It’s Worth Using

For Jewish families, the Hebrew birthday carries real religious and cultural weight that the Gregorian birthday simply doesn’t replace. Planning a Bar or Bat Mitzvah requires knowing the Hebrew date precisely — the ceremony is traditionally held on or around the Hebrew 13th birthday for boys and 12th for girls. Observing a Yahrzeit on the correct Hebrew date is an important act of remembrance in Jewish tradition. And for anyone exploring their Jewish heritage or reconnecting with their cultural roots, knowing your Hebrew birthday is a meaningful and personal piece of that connection.

The bilingual output — English transliteration alongside Hebrew script — makes the result accessible whether you’re fluent in Hebrew or entirely new to the calendar system, and practical for sharing in any context.