Convert any date between the Gregorian calendar and the Hijri calendar in its Umm al-Qura form, the official calendar of Saudi Arabia. The calculation uses your browser's built-in Umm al-Qura calendar data, so nothing is sent anywhere.
The Hijri year has 12 lunar months of 29 or 30 days, about 354 days in total, so Hijri dates move about 11 days earlier each Gregorian year. For example, 1 Muharram 1447 AH was Thursday 26 June 2025 in the Umm al-Qura calendar.
Enter your numbers and press Calculate.
Results are rounded and depend on the values you enter. Double-check anything important.
How to use the Hijri to Gregorian Date converter
- Choose the direction: Gregorian to Hijri or Hijri to Gregorian.
- Pick the Gregorian date, or enter the Hijri day, month and year.
- Press Calculate. The result also shows whether the Hijri month has 29 or 30 days.
The formula
Unlike a purely arithmetic Hijri calendar, Umm al-Qura month starts come from astronomical criteria calculated for Makkah, so they need tables. The converter estimates the day count, then checks nearby days against the browser's Umm al-Qura data until the exact match is found.
Worked example
To convert 1 Muharram 1447 AH: about 1,446 × 354.37 days after the Hijri epoch lands within a day or so of late June 2025, and the Umm al-Qura check finds the exact match, Thursday 26 June 2025.
FAQ
Is this the official Saudi calendar?
Umm al-Qura is the calendar used by the Saudi government for civil purposes. Ramadan and Eid dates are announced after moon sighting and can differ by a day.
Why can the same Hijri date fall in different seasons?
The Hijri year is about 11 days shorter than the solar year, so each date moves through all the seasons over roughly 33 years.
What date range is supported?
Hijri years 1356 to 1500 (about 1937 to 2077), where browsers ship Umm al-Qura data.
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