Hijri Date Converter (Gregorian ↔ Islamic)
Convert Gregorian dates to Hijri (Islamic) dates and back with the Saudi Umm al-Qura calendar or the tabular calendar, with month starts and the next Ramadan.
Umm al-Qura is the official calendar of Saudi Arabia, computed in advance from the moment of the new moon. Many countries and communities start months by local moon sighting instead, so the actual day can differ by one (sometimes two) days, especially for Ramadan, Shawwal and Dhu al-Hijjah.
A Hijri day begins at sunset. These dates are the daytime part of each day; the previous evening already belongs to it.
| # | Month | Arabic | Begins | Days |
|---|---|---|---|---|
| 1 | Muharram | محرم | 2026-06-16 | 29 |
| 2 | Safar | صفر | 2026-07-15 | 30 |
| 3 | Rabiʿ al-Awwal | ربيع الأول | 2026-08-14 | 29 |
| 4 | Rabiʿ al-Thani | ربيع الآخر | 2026-09-12 | 30 |
| 5 | Jumada al-Ula | جمادى الأولى | 2026-10-12 | 30 |
| 6 | Jumada al-Akhirah | جمادى الآخرة | 2026-11-11 | 29 |
| 7 | Rajab | رجب | 2026-12-10 | 30 |
| 8 | Shaʿban | شعبان | 2027-01-09 | 30 |
| 9 | Ramadan | رمضان | 2027-02-08 | 29 |
| 10 | Shawwal | شوال | 2027-03-09 | 30 |
| 11 | Dhu al-Qaʿdah | ذو القعدة | 2027-04-08 | 29 |
| 12 | Dhu al-Hijjah | ذو الحجة | 2027-05-07 | 30 |
The Hijri (Islamic) calendar has 12 lunar months of 29 or 30 days, so its year is about 11 days shorter than the Gregorian year and Ramadan moves earlier each year. This converter changes Gregorian dates into Hijri dates and back using the Umm al-Qura calendar of Saudi Arabia, or the arithmetic tabular calendar, and shows the start of each month of the year with the next Ramadan and both Eids.
How to use this tool
- Choose the direction: Gregorian to Hijri or Hijri to Gregorian.
- Enter the Gregorian date, or the Hijri day, month and year.
- Choose Umm al-Qura (official in Saudi Arabia) or the tabular calendar.
- Read the converted date, the weekday and the month table for that Hijri year.
Formula
Tabular calendar: JD = day + ⌈29.5 × (month − 1)⌉ + 354 × (year − 1) + ⌊(3 + 11 × year) ÷ 30⌋ + 1,948,438.5
The tabular calendar repeats a 30-year cycle with 11 leap years of 355 days. Umm al-Qura months are fixed in advance from astronomical rules (the new moon and moonset relative to sunset at Mecca), so they follow the real moon more closely. The conversion uses your browser's built-in Umm al-Qura data and is limited to 1356–1500 AH (14 March 1937 to 16 November 2077), the range of R. H. van Gent's Umm al-Qura converter; sample month starts were checked against his tables.
Example
In the Umm al-Qura calendar 1 Ramadan 1447 AH fell on Wednesday 18 February 2026, Eid al-Fitr on 20 March 2026 and Eid al-Adha (10 Dhu al-Hijjah) on 27 May 2026. The new year 1448 AH began on 16 June 2026, and Ramadan 1448 is expected to start on 8 February 2027.
Frequently asked questions
Why might my local Ramadan start on a different day?
Many communities begin each month when the new crescent is actually seen, which can be a day later than the calculated Umm al-Qura date (or occasionally earlier). Check your local authority's announcement for religious dates.
Which calendar should I choose?
Umm al-Qura for Saudi Arabia and most official and business uses. The tabular calendar is a simple arithmetic rule used in some software and historical work.
Why does the Hijri date change in the evening?
Islamic days begin at sunset, so the evening of a Gregorian day already belongs to the next Hijri date. This converter gives the Hijri date for the daytime.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/gregorian-to-hijri-calculator/
Cite or embed this tool
kakaoCalc. (2026, November 9). Hijri Date Converter (Gregorian ↔ Islamic). https://kakao.mobile/tools/gregorian-to-hijri-calculator/
“Hijri Date Converter (Gregorian ↔ Islamic).” kakaoCalc, 9 Nov. 2026, kakao.mobile/tools/gregorian-to-hijri-calculator/.
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