Age Calculator by Birthdate: Gregorian and Hebrew Calendar

An age calculator is an online tool that computes exact age in years, months, and days from a date of birth. TopicPen's age calculator adds full Hebrew calendar support: Hebrew age, Hebrew birth date, next Hebrew birthday, and bar/bat mitzvah date. For example, someone born on January 10, 1990, is exactly 36 years, 2 months, and 28 days old on April 7, 2026. The result updates instantly as you change the date.

Beyond Gregorian age, the calculator shows Hebrew calendar age. The Hebrew calendar is a lunisolar system: a regular year has 354 days (12 months) and a leap year has 384 days (13 months, adding Adar II). Leap years occur 7 times in every 19-year cycle. Bar mitzvah is computed as the 13th Hebrew birthday; bat mitzvah falls on the 12th by many traditions. Both dates are displayed in Hebrew and Gregorian notation.

The calculator detects Jewish holidays: if your birthdate falls on Rosh Hashana, Yom Kippur, Passover, Shavuot, Sukkot, Hanukkah, or another major holiday, a banner appears. A countdown to your next birthday is shown automatically. To find the Gregorian equivalent of a Hebrew birthdate, use the Date Converter. All Hebrew calendar computations use @hebcal/core, an MIT-licensed open-source library for Jewish date calculations.

Age Calculator FAQ

How do you calculate exact age from a date of birth?+
Age is calculated in three steps: first complete years, then additional months, then remaining days. For example, someone born on February 10, 1990, is 36 years, 3 months, and 26 days old on June 5, 2026. The calculator handles months of different lengths and leap years automatically.
What is the difference between Hebrew age and Gregorian age?+
Hebrew age counts years by the Hebrew lunisolar calendar. A regular Hebrew year has 354 days (12 lunar months); a leap year has 384 days (with an extra month, Adar II). Leap years occur 7 times in every 19-year cycle. Because of this structure, the Hebrew birthday can fall before or after the Gregorian birthday, so the Hebrew age may differ by 1 from the Gregorian age.
When exactly is bar mitzvah according to the Hebrew calendar?+
Bar mitzvah falls on the boy's 13th Hebrew birthday, meaning the same Hebrew day and month in his 13th Hebrew year. Bat mitzvah falls on the 12th birthday by tradition. The calculator shows both dates: the Hebrew date (in gematria notation) and the full Gregorian date.
What is a Hebrew birthday?+
A Hebrew birthday is the same day and month in the Hebrew calendar on which you were born. It is observed each year according to the Hebrew calendar and falls on different Gregorian dates from year to year, because the Hebrew calendar is not synchronized with the Gregorian. For example, someone born on January 1 may have a Hebrew birthday in December, January, or even February in different years.
Can I calculate age from a Hebrew birth date?+
Yes. Convert your Hebrew birth date to a Gregorian date using TopicPen's Date Converter tool (available on the tools page), then enter the Gregorian date into the age calculator.
Why is my age different in the Hebrew calendar?+
The Hebrew calendar is lunisolar and includes leap years with an extra month (Adar II), added 7 times in every 19-year cycle. As a result, the Hebrew birthday does not always fall at the same point in the Gregorian year, and the difference between Hebrew and Gregorian age can shift from year to year.

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