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Hijri to Gregorian Date Converter — Islamic Calendar to Gregorian | LazyTools
Islamic Calendar Tool

Hijri to Gregorian Date Converter — Islamic Calendar Conversion

Convert any date in the Islamic Hijri calendar to its Gregorian equivalent. Enter the Hijri day, month and year — and see the corresponding Gregorian date in long form, ISO format and DD/MM/YYYY simultaneously. Furthermore, the Full Hijri Year tab shows all 12 months of any Hijri year with their Gregorian start and end dates and the number of days in each month.

All 12 Hijri monthsFull Hijri year viewISO and EU formatsDay of week includedAccurate algorithm

How to use the Hijri to Gregorian Date Converter

1
Enter the Hijri date components
Enter the day (1–30), select the month from the dropdown and type the Hijri year in AH. Furthermore, the fields default to today's Hijri date — click Convert immediately to see today's Gregorian equivalent without any input.
2
Click Convert to Gregorian
The result shows the Gregorian date in three formats: long form (1 January 2026), ISO (2026-01-01) and DD/MM/YYYY. Additionally, the day of the week appears in the stat strip.
3
Check the insight line
The insight sentence at the bottom reads the full conversion as a plain-English statement. Furthermore, this is useful for copying directly into emails, documents or calendar event descriptions.
4
Switch to Full Hijri Year for planning
Click the Full Hijri Year tab and enter any Hijri year. Furthermore, clicking Show Full Hijri Year produces a 12-row table showing the Gregorian start date, end date and day count for every Hijri month in that year.
5
Use the total days row for year length
The final row of the Full Year table shows the total days in that Hijri year. Furthermore, Hijri years alternate between 354 and 355 days — the total row makes it immediately clear whether the selected year is a short or long Islamic year.

How the Hijri year length varies

Hijri years have either 354 or 355 days. Furthermore, the 355-day years (called kabisa years) occur 11 times in a 30-year cycle. A 30-year cycle contains 10,631 days — exactly the same as 19 solar years in the Metonic cycle by coincidence.

Hijri monthStandard daysNotes
Muharram (1)30Sacred month; Islamic New Year
Safar (2)29—
Rabi Al-Awwal (3)30Prophet's birth month
Rabi Al-Thani (4)29—
Jumada Al-Awwal (5)30—
Jumada Al-Thani (6)29—
Rajab (7)30Sacred month; Isra and Mi'raj
Shaaban (8)29Pre-Ramadan preparation
Ramadan (9)30Month of fasting; holiest month
Shawwal (10)29Eid Al-Fitr (1st Shawwal)
Dhul Qadah (11)30Sacred month
Dhul Hijja (12)29 or 30Sacred month; Hajj; Eid Al-Adha (10th)

How Hijri dates are converted to Gregorian

The conversion algorithm works via the Julian Day Number — a continuous day count used in astronomy since 4713 BCE. Furthermore, the Hijri date is first converted to a Julian Day Number using the tabular Islamic calendar arithmetic, and that number is then converted to a Gregorian date.

JD = floor(11×H_year + 3)/30 + 354×H_year + 30×H_month − floor((H_month−1)/2) + H_day + epoch
Epoch = 1948440 − 385 (Julian Day of Hijri epoch)
H_year/H_month/H_day = Hijri year, month and day as integers
JD → Gregorian = standard proleptic Gregorian calendar arithmetic
Accuracy = within 1–2 days of the observed Islamic calendar

Why the result may differ by one day from official dates

The tabular algorithm is a mathematical model. Furthermore, the official Islamic calendar used in Saudi Arabia and UAE uses actual moon sighting — which can differ by one day from the calculated value depending on cloud cover and atmospheric conditions. Moreover, different countries may sight the moon on different dates, causing their Hijri calendars to differ by a day. Always verify religious dates with official announcements from the relevant country's authorities.

Worked example: converting Eid Al-Fitr

Eid Al-Fitr falls on 1 Shawwal every Islamic year. For Hijri year 1447 AH, what Gregorian date does 1 Shawwal correspond to?

Input (Hijri)Value
Day1
Month10 — Shawwal
Year1447 AH
Output (Gregorian)Value
Long form29 March 2026
ISO format2026-03-29
Day of weekSunday
1 Shawwal 1447 AH falls on approximately 29 March 2026 — a Sunday. This is the calculated date; the official Eid Al-Fitr date will be confirmed by Saudi Arabia, UAE and other national authorities based on moon sighting and may differ by one day.

What is the Hijri to Gregorian conversion?

Hijri to Gregorian conversion translates an Islamic date into its Gregorian equivalent. Furthermore, both calendars track the same continuous flow of time — they simply label it differently. The conversion maps a Hijri day, month and year to the Gregorian date for the same moment.

The conversion is useful whenever Islamic calendar dates need to appear in Gregorian contexts — government documents, international business communications, digital calendar applications and scheduling tools. Moreover, converting Hijri dates to Gregorian allows Islamic observances to be integrated into Western-format calendars and scheduling systems.

Practical uses of Hijri to Gregorian conversion

Government agencies in Muslim-majority countries issue official documents with both Hijri and Gregorian dates. Furthermore, converting historical Hijri dates — on old contracts, birth certificates or land records — to Gregorian dates is often necessary for modern legal or genealogical research. Moreover, businesses tracking Islamic holidays for planning need to convert Hijri dates to Gregorian for digital calendar entry.

How the Hijri year relates to the Gregorian year

The Hijri year is approximately 354 days long — about 11 days shorter than the Gregorian year. Furthermore, this means one complete Gregorian year spans parts of two Hijri years. The Full Hijri Year view shows exactly which Gregorian dates correspond to each month of a given Hijri year, making this relationship concrete and queryable for any year from 1300 to 1600 AH.

Why Hijri to Gregorian conversion matters

Islamic finance operates on both calendars simultaneously. Furthermore, sukuk maturities and profit schedules specify dates in both formats. Furthermore, a one-day misalignment creates legal and financial compliance risks.

Event planning in the Gulf requires accurate Hijri-to-Gregorian mapping. Corporate calendars must account for Eid, the Prophet's Birthday and other Islamic dates. Furthermore, these are specified in Hijri but must be entered into Gregorian scheduling systems. Moreover, these dates shift by approximately 11 days each year, so the conversion is required annually.

How the Full Hijri Year view aids annual planning

The Full Hijri Year table gives a complete mapping of all 12 Islamic months to their Gregorian start and end dates for any year. Furthermore, this enables annual Islamic calendar planning in a single view — seeing when Ramadan begins and ends, when both Eids fall and how many days each month contains. Moreover, the total days row immediately shows whether the year is 354 or 355 days long — useful for comparison with the 365-day Gregorian year in multi-year planning horizons.

Frequently asked questions

Eid Al-Adha falls on 10 Dhul Hijja each Hijri year. Enter 10 as the day, Dhul Hijja as the month and the current Hijri year as the year, then click Convert. Furthermore, the result gives the calculated Gregorian date. Note that the official Eid Al-Adha date is confirmed by Saudi Arabia's Umm Al-Qura calendar and individual country announcements — which may differ by one day from this calculation.
In 2025–2026 CE, the Hijri year is 1447 AH. Furthermore, the Hijri new year (1 Muharram) falls at a different Gregorian date each year because the Islamic year is approximately 11 days shorter than the Gregorian year. The single date converter defaults to today's Hijri date automatically when you open the tool.
Most Hijri years have 354 days. Approximately 11 years out of every 30 have 355 days — called kabisa or intercalary years. Furthermore, the Full Hijri Year view shows the total days in any year you select. A 354-day Hijri year is about 11 days shorter than the Gregorian year; this 11-day difference causes Islamic calendar dates to advance through the Gregorian calendar year by year.
Yes. The converter handles Hijri years from 1300 AH onwards (corresponding to approximately 1882 CE onwards). Furthermore, the algorithm is accurate for this range and is appropriate for converting dates on historical documents, court records, property deeds and birth certificates issued under Hijri dating. For dates before 1300 AH, specialist historical calendar tools are recommended.
The tool uses the tabular Islamic calendar — a mathematical approximation. Official Islamic calendars in Saudi Arabia, UAE and other countries use actual moon sighting to determine month starts. Furthermore, moon visibility depends on atmospheric conditions and geographic location, so the observed start of a month can differ by one day from the calculated date. Official dates for Ramadan, Eid and Hajj are always confirmed by government religious authorities.

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