Convert between Hijri (Islamic) and Gregorian calendars instantly. Perfect for birthdays, anniversaries & Islamic dates.
The Hijri calendar (Islamic calendar) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the Hajj. Our converter uses astronomical algorithms to provide accurate conversions between Hijri and Gregorian dates. Whether you're planning for Ramadan, Eid celebrations, or tracking personal milestones, this tool provides instant and reliable date conversions with full month names in both Arabic and English transliteration.
Our converter uses established astronomical algorithms. However, Islamic authorities may use slightly different methods for religious observances.
The converter supports a wide range of dates, but extreme historical dates may have limited accuracy.
The Islamic calendar determines religious holidays like Ramadan, Eid al-Fitr, Eid al-Adha, and the Hajj pilgrimage dates.
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The Hijri (Islamic) calendar governs the religious life of nearly two billion Muslims — setting Ramadan's fast, the Hajj pilgrimage, and the two Eid festivals. It is a purely lunar calendar, which gives it a structure and rhythm quite different from the Gregorian system, and explains the perennial questions this converter answers: why Islamic dates drift through the seasons, and why the same occasion can begin on different evenings in different countries.
The Hijri year consists of 12 months that follow the Moon's phases, each lasting 29 or 30 days — a lunar month averages 29.53 days. The months are Muharram, Safar, Rabi' al-Awwal, Rabi' al-Thani, Jumada al-Awwal, Jumada al-Thani, Rajab, Sha'ban, Ramadan, Shawwal, Dhu al-Qi'dah, and Dhu al-Hijjah. Four of them — Muharram, Rajab, Dhu al-Qi'dah, and Dhu al-Hijjah — are the traditional sacred months. A full Hijri year runs 354 or 355 days, roughly 11 days shorter than the solar year.
Those missing 11 days accumulate: every Hijri date arrives about 11 days earlier on the Gregorian calendar each year, cycling through all four seasons over roughly 33 years. A Ramadan that falls in high summer — with long, hot fasting days in the northern hemisphere — will, sixteen years later, fall in winter with short days. This is by design: the Islamic calendar deliberately contains no leap-month correction to the sun, following the Quranic prescription of twelve lunar months. It also means a Muslim's age in Hijri years is slightly higher than in Gregorian years — about one extra year for every 33 lived.
The calendar counts from the Hijra — the Prophet Muhammad's migration from Mecca to Medina — with year 1 AH beginning in 622 CE. The era was formally adopted as the civil calendar under Caliph Umar around 17 AH. A rough mental conversion: Gregorian year ≈ Hijri year × 0.97 + 622. For 1447 AH: 1447 × 0.97 + 622 ≈ 2025–2026 CE, matching the current year. The precision this converter provides comes from proper astronomical tables rather than that approximation.
Historically each month began when the new crescent was physically sighted, and many communities and religious authorities still follow local or regional sighting — which weather and geography can shift by a day. Other institutions use pre-computed astronomical calendars; the most widely used is the Umm al-Qura calendar of Saudi Arabia, which fixes month starts by calculated criteria. Converters, including this one, rely on such computed calendars (via established Islamic-date data sources), so a result can differ by one day from the date observed in a particular country. For worship-critical dates — the start of Ramadan, the day of Eid — the announcement of your local religious authority is the operative reference.