Date & Time
Hijri Calendar Converter - Islamic Date to Gregorian
Convert dates between the Hijri (Islamic) calendar and the Gregorian calendar. Uses the tabular Islamic calendar algorithm. Works entirely offline in your browser.
What is the Hijri calendar?
The Hijri calendar (also called the Islamic calendar or AH calendar, from Anno Hegirae ("Year of the Hijra")) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It is used by Muslims worldwide to determine the proper days for Islamic holidays and rituals such as the fasting month of Ramadan and the Hajj pilgrimage.
The 12 Hijri months
- Muharram
- Safar
- Rabīʿ al-Awwal
- Rabīʿ al-Thānī
- Jumādā al-Awwal
- Jumādā al-Thānī
- Rajab
- Shaʿbān
- Ramaḍān
- Shawwāl
- Dhū al-Qaʿdah
- Dhū al-Ḥijjah
Tabular vs. observational Hijri calendar
The observational Hijri calendar begins each month on the day following the first sighting of the crescent moon, which can vary by location. This calculator uses the tabular (arithmetic) Hijri calendar, a mathematical approximation used in historical scholarship and computing. Results may differ by 1–2 days from the official observational calendar used in some countries.
Islamic holidays
Because the Hijri year is approximately 11 days shorter than the Gregorian year, Islamic holidays shift to earlier Gregorian dates each year, cycling through all seasons over about 33 years:
- Ramadan: the 9th month - a month of fasting from dawn to sunset
- Eid al-Fitr: 1 Shawwal - celebration marking the end of Ramadan
- Eid al-Adha: 10 Dhul Hijjah - the Feast of Sacrifice, coinciding with the Hajj pilgrimage
- Islamic New Year: 1 Muharram - the start of the Hijri year
Umm al-Qura vs. ruʿyah (moon sighting)
Saudi Arabia uses the Umm al-Qura calendar, based on astronomical calculations of the predicted new moon, to set official dates. Many Muslim communities worldwide follow ruʿyah (actual crescent moon sighting), which can differ by one day depending on local weather and geography. This means Eid and Ramadan may begin on different days in different countries.
Frequently asked questions
Why does the Hijri year drift against the Gregorian year?
The Hijri year is ~354 days, about 11 days shorter than the 365.25-day solar year. This means the Hijri calendar drifts backward through the seasons by about 11 days per year, completing a full cycle through the Gregorian calendar in approximately 33 years.
What is the current Hijri year?
As of 2025 CE, the current Hijri year is approximately 1446–1447 AH.