Hijri to Gregorian Converter

The Hijri (Islamic) calendar is a purely lunar calendar consisting of 12 months in a year of 354 or 355 days, making it approximately 11 days shorter than the Gregorian solar calendar each year. It is the official calendar used across the Muslim world to determine Islamic holidays such as Ramadan, Eid al-Fitr, Eid al-Adha, and the Hajj pilgrimage season. The calendar begins its epoch in 622 CE, the year of Prophet Muhammad's migration (Hijra) from Mecca to Medina. Because it is purely lunar, Islamic dates rotate through the Gregorian seasons over a roughly 33-year cycle. This is why Ramadan, for example, occurs about 11 days earlier each Gregorian year. A reliable Hijri to Gregorian converter is essential for planning events, coordinating schedules across calendar systems, and verifying important Islamic dates.

The Umm al-Qura calendar is the official Islamic calendar published by the Institute of Astronomical Research in Riyadh, Saudi Arabia. Unlike simpler tabular or arithmetic Hijri methods that use fixed approximations to estimate month lengths, the Umm al-Qura system is based on precise astronomical calculations of lunar crescent visibility at the Kaaba's coordinates. This makes it significantly more accurate for modern date conversions and is the standard used by the Saudi government, many Muslim-majority countries, and major technology platforms including Apple, Google, and Microsoft. By choosing the Umm al-Qura system, this Hijri to Gregorian converter delivers the same level of accuracy as the calendar apps on your phone and computer. The tool accesses this data through the browser's native Intl.DateTimeFormat API, meaning no external libraries or server calls are needed.

This Hijri to Gregorian converter supports conversion in both directions, which is more technically challenging than it might seem. For the Gregorian-to-Hijri direction, the tool uses the browser's built-in Intl.DateTimeFormat API configured with the islamic-umalqura calendar system to produce the Hijri equivalent of any Gregorian date instantly. The reverse direction — Hijri to Gregorian — is more complex because the Intl API does not natively support it. To solve this, the tool employs an efficient binary search algorithm that iterates over Gregorian dates and compares their Hijri representations until it finds the exact match. Both directions execute in milliseconds with no perceptible delay. No network requests are made during conversion, and the entire process runs locally in your browser using built-in JavaScript APIs.

This converter is highly accurate for modern dates because it relies on the Umm al-Qura calendar data that is built into all modern web browsers. This is the same astronomically-computed calendar data used by major operating systems for their native Islamic calendar support, so the results match what you see on an iPhone, Android phone, or Windows date picker. For dates within the typical range of 1318 to 1500 AH (approximately 1900 to 2076 CE), the accuracy is excellent and aligns with the official Saudi Umm al-Qura publications. For very historical dates before this range, minor variations may exist between different Islamic calendar authorities. If you need to verify a specific date for legal, religious, or official purposes, it is always advisable to cross-reference with your local Islamic authority.

Yes. Once the page has loaded in your browser, all Hijri to Gregorian and Gregorian to Hijri conversions work completely offline without an internet connection. This is possible because the tool relies entirely on the browser's built-in Intl.DateTimeFormat API and pure JavaScript calculations — no external servers, APIs, or databases are contacted during the conversion process. You can bookmark the page and use it as a quick reference tool anytime, even on a plane or in an area without cellular coverage. This makes it one of the most reliable and accessible Islamic calendar converters available.

The converter supports a wide range of dates that covers virtually all practical use cases. The underlying Umm al-Qura calendar data in modern browsers typically spans from approximately 1318 AH to 1500 AH, which corresponds to roughly 1900 CE to 2076 CE on the Gregorian calendar. This range is more than sufficient for planning upcoming Islamic holidays, calculating birthdays or anniversaries, researching recent historical dates, or determining future event dates. If you need dates outside this range for academic or historical research, you may need to consult specialized Islamic calendar reference tables, as browser support for extremely distant dates can be inconsistent.

Hijri dates can vary by one or two days between different countries because some Muslim communities determine the start of each lunar month by local physical moon sighting rather than astronomical calculation. For example, Saudi Arabia, Pakistan, and Turkey may announce the beginning of Ramadan on different days depending on whether the crescent moon was physically observed in each country. The Umm al-Qura calendar used by this converter follows the astronomical calculation method, which provides a standardized reference but may not always match the actual date observed in your specific locality. For religious observances where the exact day matters, it is always best to follow the announcement from your local Islamic authority or mosque.

Yes. This online Hijri to Gregorian converter is completely free to use with no limitations whatsoever. There are no subscriptions, no account registration, no ads, no watermarks, and no hidden fees. You can perform unlimited conversions in both directions — Hijri to Gregorian and Gregorian to Hijri — as many times as you need. The tool runs entirely in your web browser using built-in APIs, which means there are no server costs to pass on to users. It will remain free indefinitely.

Absolutely. This Hijri to Gregorian converter processes everything locally in your web browser and does not transmit any data to external servers. The dates you enter are never logged, stored, or shared with anyone. There are no analytics tracking your specific conversions, no cookies recording your date inputs, and no account system that could associate conversions with your identity. This makes it a safe choice for converting sensitive dates related to personal events, legal documents, or religious planning without any privacy concerns.

A Hijri to Gregorian date converter serves many practical purposes across personal, professional, and religious life. Muslims frequently use it to determine the Gregorian dates of upcoming Islamic holidays like Ramadan, Eid al-Fitr, Eid al-Adha, and the Day of Arafah for planning travel and time off from work. It is also useful for converting birth dates, wedding anniversaries, and death anniversaries that were originally recorded in the Hijri calendar. Businesses operating in Muslim-majority countries use it for scheduling around public holidays. Students and researchers use it to align historical Islamic dates with Gregorian timelines for academic work. Immigration and legal offices use it to convert dates on official documents between the two calendar systems.