Hijri Calendar 2026 - Complete Guide to Converting Between Islamic and Gregorian Dates

Understanding the Islamic Hijri Calendar

The Islamic Hijri calendar, also known as the Muslim or Lunar Hijri calendar, is a purely 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, rituals, and important events such as the beginning of Ramadan, the Hajj pilgrimage, and the festivities of Eid. Unlike the solar Gregorian calendar, which is based on the Earth's orbit around the Sun, the Hijri calendar follows the phases of the moon, making it approximately 10 to 11 days shorter each year.

The starting point of this calendar is the Hijra—the migration of Prophet Muhammad (peace be upon him) from Mecca to Medina in 622 CE. This historic event marked the establishment of the first Muslim community and serves as the epoch for the Islamic era. The abbreviation "AH" stands for "Anno Hegirae" (in the year of the Hijra), corresponding to the Latin "AD" used in the Gregorian calendar.

Structure of the Hijri Calendar: The 12 Islamic Months

The Hijri year consists of 12 months, each beginning with the sighting of the new crescent moon. Their sequence, Arabic names, and brief significance are as follows:

Muharram – The first month, considered sacred; the Day of Ashura (10th) is observed with fasting.
Safar – The second month, traditionally associated with travel and historical events.
Rabi' al-Awwal – The third month, celebrated for the birth of Prophet Muhammad (Mawlid).
Rabi' al-Thani (or Rabi' al-Akhir) – The fourth month.
Jumada al-Awwal – The fifth month.
Jumada al-Thani (or Jumada al-Akhirah) – The sixth month.
Rajab – The seventh month, one of the four sacred months; Isra and Mi'raj is believed to have occurred here.
Sha'ban – The eighth month, a time of preparation for Ramadan.
Ramadan – The ninth and holiest month, during which Muslims fast from dawn to sunset.
Shawwal – The tenth month; the first day is Eid al-Fitr, marking the end of Ramadan.
Dhu al-Qa'dah – The eleventh month, another sacred month.
Dhu al-Hijjah – The twelfth and final month, the month of Hajj pilgrimage and Eid al-Adha.

Each month alternates between 29 and 30 days, but the exact length is traditionally determined by moon sighting. This variability makes precise conversion between Hijri and Gregorian dates a bit challenging and is why a reliable Hijri date converter is so useful.

Key Differences Between Hijri and Gregorian Calendars

The Gregorian calendar is solar-based with 365 days in a common year and 366 in a leap year, aligning with the seasons. The Hijri lunar year is about 11 days shorter. This means that Islamic months cycle through all seasons over a 33-year period. For instance, Ramadan can fall in winter, spring, summer, or autumn over the years. This seasonal rotation ensures that fasting and other rituals are experienced in varying climatic conditions, which many see as a spiritual equalizer across geographies and times.

Leap Years in the Hijri Calendar

In contrast to the Gregorian leap year rule (every 4 years except century years not divisible by 400), the Hijri calendar incorporates leap years in a 30-year cycle. There are 11 leap years in this cycle where an extra day is added to the last month, Dhu al-Hijjah, making it 30 days instead of 29. The most commonly used sequence for these leap years is based on the Kuwaiti algorithm: years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, and 29 of the cycle. This pattern keeps the calendar aligned with the lunar phases over the long term.

Why Convert Between Hijri and Gregorian Dates?

In our interconnected world, Muslims living in predominantly Gregorian-calendar countries often need to know the Hijri date for religious observances, while historians, researchers, and international travelers need to switch between the two systems. Common conversion needs include:

Determining the start of Ramadan or Hajj according to both calendars.
Scheduling business meetings or events that respect Islamic holidays.
Documenting dates in legal or religious certificates (e.g., marriage, birth) that may require both formats.
Understanding historical Islamic dates in relation to Western history.
Planning travel to Muslim-majority countries that officially use the Hijri calendar.

The Challenge of Conversion: Observation vs. Calculation

One of the main complexities in Hijri-Gregorian conversion arises from the method used to determine the start of each Islamic month. There are two primary approaches:

Observational (Ruyah) Method

The traditional method relies on the physical sighting of the new crescent moon by reliable witnesses. This means that the beginning of a month can vary by a day or even two between different regions or Muslim communities. For example, Saudi Arabia might announce the start of Ramadan based on moon sightings, while other countries might follow their local sightings or Saudi declarations. This lack of uniformity means that a date like 1 Ramadan 1447 AH could correspond to different Gregorian dates in different parts of the world.

Arithmetical (Tabular) Calendars

To simplify scheduling and record-keeping, Muslim scholars developed fixed-rule calendars that predict lunar months without relying on actual sightings. The most widely used is the Umm al-Qura calendar used by Saudi Arabia for civil purposes, though official religious decisions still depend on sightings. Other notable tabular calendars include the Islamic calendar of Turkey and the Habash Al-Hasib algorithm. These calendars use pre-defined alternating month lengths and a leap year pattern to approximate the lunar cycle. Tools like our Hijri date converter typically rely on such authoritative arithmetical calendars to provide immediate, accurate conversions for planning purposes.

How the Hijri Date Converter Works

Modern Hijri date converters use sophisticated algorithms based on the chosen tabular Islamic calendar. Here’s a simplified explanation:

The converter starts with a known epoch: 1 Muharram 1 AH is generally accepted as corresponding to 16 July 622 CE in the Julian calendar (or 19 July 622 CE in the proleptic Gregorian calendar).
It calculates the total number of days elapsed in the Islamic calendar from the epoch to the target date, accounting for month lengths, leap years, and the day offset.
It then converts that total into a Gregorian date by adding the corresponding number of days to the Gregorian epoch (using proper leap year rules for the Gregorian side).
For Gregorian-to-Hijri, the process is reversed.

Our online converter at /en/tools/hijri-converter instantly performs these calculations, supporting both directions and displaying the result in a clear, user-friendly format. It even shows the Islamic day name (e.g., Yawm al-Ahad – Sunday) for additional context.

Step-by-Step Guide to Using the Hijri Date Converter

Using the converter is straightforward. Follow these steps to convert any date:

Converting Hijri to Gregorian

Visit the Hijri Date Converter page.
Select the "Hijri to Gregorian" conversion direction.
Enter the Hijri date: day, month (choose from the list of Islamic months), and year AH.
Click the "Convert" button.
The tool will display the equivalent Gregorian date. It may also show the corresponding Julian date for historical accuracy and the day of the week.

Converting Gregorian to Hijri

On the same page, switch to the "Gregorian to Hijri" mode.
Input the Gregorian day, month, and year.
Press "Convert".
The result will show the Hijri date according to the selected Islamic calendar reference (often Umm al-Qura by default, with options for others if provided).

The converter also often includes a visual Hijri calendar for the selected year, showing the whole year at a glance with Gregorian equivalents—perfect for planning holidays like Ramadan or Hajj in 2026.

Hijri Calendar in 2026: Key Dates and Projections

The Hijri year 1447 AH begins (approximately) in the evening of 16 July 2025, and 1448 AH starts around 5 July 2026. Thus, most of 2026 Gregorian corresponds to the latter part of 1447 and the beginning of 1448 AH. Here’s a projection of significant Islamic events in 2026 using the Umm al-Qura calculated calendar. Please note that actual dates may vary based on moon sightings:

Start of Ramadan 1447 AH – Approximately Monday, 17 February 2026 (may be 18 February in some regions).
Eid al-Fitr (1 Shawwal 1447) – Approximately Thursday, 19 March 2026.
Day of Arafah (9 Dhu al-Hijjah 1447) – Approximately Tuesday, 26 May 2026.
Eid al-Adha (10 Dhu al-Hijjah 1447) – Approximately Wednesday, 27 May 2026.
Islamic New Year (1 Muharram 1448) – Approximately Sunday, 5 July 2026.
Ashura (10 Muharram 1448) – Approximately Tuesday, 14 July 2026.
Mawlid al-Nabi (12 Rabi' al-Awwal 1448) – Approximately Tuesday, 13 September 2026.

These dates illustrate how the converter can help you plan ahead. By entering these Islamic dates into the Hijri date converter, you can confirm the Gregorian equivalent and set reminders or schedule time off.

Manual Conversion: The Traditional Way

Before digital tools, scholars and astronomers used mathematical formulas. For those interested, a common short-cut formula for a rough conversion (using a tabular calendar) is:

Gregorian year ≈ Hijri year × 0.97 + 622

And conversely: Hijri year ≈ (Gregorian year − 622) × 1.03

However, these formulas give only the year, not the exact date, and they accumulate errors over centuries. For day-accurate conversion, one must use a conversion table or the exact algorithm. The converter tool handles all that complexity seamlessly.

Historical Perspectives on Hijri-Gregorian Correlation

The correlation between the Islamic and Gregorian calendars has been studied extensively. While 1 Muharram 1 AH is widely cited as 16 July 622 CE (Julian), some astronomers argue for 15 July or even 17 July. The difference arises from historical sightings, the interpretation of ancient records, and whether one uses the astronomical new moon or the crescent visibility. Most modern converters, including our own, adopt the convention accepted by the majority of Islamic authorities, ensuring consistency with official Umm al-Qura dates.

Practical Tips for Using the Hijri Calendar

Always confirm religious dates locally: Despite calculator convenience, fasting, Eid, and Hajj dates should be confirmed by local moon sighting authorities to fulfill religious obligations correctly.
Use the converter for future planning: Many organizations use calculated dates to print calendars well in advance, but remember they are approximate for sighting-based events.
Understand the calendar variant: If you’re using dates from Turkey, Iran (which uses the Solar Hijri calendar, a different system), or North Africa, check which Islamic calendar reference is being used, as they may differ by a day or two.
Be aware of the day starting at sunset: In the Islamic day, the date changes at Maghrib (sunset), not midnight. So an event on “Friday night” corresponds to the night after Thursday sunset. The converter tool typically displays the civil date, but for worship purposes, the night belongs to the next day.

Frequently Asked Questions about the Hijri Calendar

Why does the Hijri calendar shift every year?

Because it is a pure lunar calendar, it does not intercalate to stay aligned with the solar seasons. The 11-day difference causes the months to retrograde through the Gregorian year roughly every 33 years.

Which countries officially use the Hijri calendar?

Saudi Arabia uses the Umm al-Qura calendar for civil purposes; other nations like Iran and Afghanistan use the Solar Hijri calendar, which is different. Many Muslim-majority countries use the Gregorian calendar for official business but refer to the Hijri calendar for religious affairs.

Is there a 100% accurate converter?

Any converter based on a tabular calendar is mathematically precise within its own system, but it may not match the observational calendar used for religious decisions. For 99% of day-to-day needs, our converter at /en/tools/hijri-converter provides reliable conversions that align with widely accepted standards.

Conclusion

The Islamic Hijri calendar is a profound system rooted in faith and history. Its lunar nature provides a unique rhythm for Muslim life, while the need to correlate it with the globally dominant Gregorian calendar makes conversion tools essential. Whether you are scheduling around Ramadan 2026, planning a trip to Mecca for Hajj, or simply curious about the Islamic date of your birth, a reliable Hijri date converter empowers you with instant and accurate information. Bookmark the tool and navigate between the two calendars effortlessly, gaining a deeper appreciation for Islamic timekeeping.