Convert between the Islamic (Hijri) calendar and the English (Gregorian) calendar instantly — for birthdays, anniversaries, and important Islamic dates.
The Hijri calendar is the Islamic lunar calendar, beginning from the year of the Prophet Muhammad's (PBUH) migration (Hijra) from Mecca to Medina in 622 CE. Unlike the Gregorian calendar, which is solar (365 days), the Hijri calendar is purely lunar with 12 months of either 29 or 30 days, totaling approximately 354-355 days per year — about 11 days shorter than the Gregorian year.
This means Islamic dates shift earlier by about 11 days each Gregorian year — Ramadan, Eid, and other Islamic occasions occur about 11 days earlier each solar year, cycling through all seasons over approximately 33 years. This is why Ramadan can fall in summer in some years and winter in others.
Important note on accuracy: This calculator uses a mathematical (tabular) Hijri calendar based on standard astronomical calculations. The ACTUAL Islamic calendar in practice depends on moon sighting (Ru'yah) announced by religious authorities, which can differ by 1 day from mathematical calculations. For religious purposes (Ramadan start, Eid dates), always confirm with official announcements from Pakistan's Ruet-e-Hilal Committee or your local mosque — this tool is best used for approximate dates, birth date conversions, and historical reference.