For a very rough conversion, multiply the Islamic year number by ०.९७, and then add ६२२ to get the Gregorian year number. An Islamic year will be entirely within a Gregorian year of the same number in the year २०८७४. The Islamic calendar year of १४२९ occurs entirely within the Gregorian calendar year of २००८. Such years occur once every ३३ or ३४ Islamic years (३२ or ३३ Gregorian years). More are listed here: