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PricingAboutSupportHebrew Leap Year
Enter any Hebrew year and see whether it's a leap year, where it falls in the 19-year cycle, how many months and days it has, and the leap years coming up next.
| Hebrew Year | Cycle Position | Leap Year? |
|---|---|---|
| 5787 | 11 of 19 | Yes, Adar I and Adar II |
| 5788 | 12 of 19 | No, Adar only |
| 5789 | 13 of 19 | No, Adar only |
| 5790 | 14 of 19 | Yes, Adar I and Adar II |
| 5791 | 15 of 19 | No, Adar only |
| 5792 | 16 of 19 | No, Adar only |
| 5793 | 17 of 19 | Yes, Adar I and Adar II |
| 5794 | 18 of 19 | No, Adar only |
| 5795 | 19 of 19 | Yes, Adar I and Adar II |
| 5796 | 1 of 19 | No, Adar only |
| 5797 | 2 of 19 | No, Adar only |
| 5798 | 3 of 19 | Yes, Adar I and Adar II |
| 5799 | 4 of 19 | No, Adar only |
| 5800 | 5 of 19 | No, Adar only |
| 5801 | 6 of 19 | Yes, Adar I and Adar II |
| 5802 | 7 of 19 | No, Adar only |
| 5803 | 8 of 19 | Yes, Adar I and Adar II |
| 5804 | 9 of 19 | No, Adar only |
| 5805 | 10 of 19 | No, Adar only |
Why the Calendar Adds a Month
The Hebrew calendar is lunar: twelve months of about 29 or 30 days add up to roughly 354 days, eleven short of the 365-day solar year. Left alone, a lunar calendar drifts through the seasons, the way the Islamic calendar does, where Ramadan cycles through every season over about 33 years.
The Hebrew calendar avoids that drift by adding a 13th month, a second Adar, in 7 of every 19 years. That 19-year cycle (the Metonic cycle) keeps the lunar months in step with the solar year closely enough that Passover always falls in spring and Sukkot always falls in autumn.
Adar I and Adar II
In a leap year, Adar I (30 days) comes first, followed by Adar II (29 days), which carries Purim and all of Adar's usual observances. Adar I has a minor, obligation-free echo of Purim called Purim Katan.
Related
Frequently Asked Questions
Why does the Hebrew calendar add a month?
The Hebrew calendar is lunar, and twelve lunar months (about 354 days) fall roughly 11 days short of a solar year. Left uncorrected, festivals tied to the seasons, like Passover in spring, would slowly drift through the year. Adding a 13th month seven times every 19 years keeps them in place.
What is the difference between Adar I and Adar II?
In a leap year, the extra month is inserted before the regular Adar: Adar I comes first and has 30 days, Adar II follows and has 29 days and carries all of Adar's usual observances.
Which Adar is Purim in?
In a leap year, Purim falls in Adar II, not Adar I. Adar I of a leap year has a minor, low-key echo called Purim Katan with no obligations.