Fast and private hijri to gregorian conversion
This dual-mode Islamic calendar converter allows you to seamlessly translate dates between the Gregorian (solar) and Hijri (lunar) systems. Whether you need to find out when a historical event occurred in the Islamic calendar, plan for upcoming religious observances, or simply check the Hijri date today, the tool provides instant, accurate results.
Because the conversion logic runs entirely on your device, the tool is completely private. If you are entering personal information like your date of birth to calculate your age, you can do so knowing that your data never leaves your browser. There are no servers processing your input, which also means the converter works instantly without any loading times or network delays.
How the Islamic calendar converter works
The tool offers two main modes of operation: Gregorian to Hijri and Hijri to Gregorian.
When converting to Hijri, simply use the standard calendar picker to select a date. The tool accepts dates ranging from January 1, 1925, to December 31, 2076. It instantly outputs the corresponding day, month, and year in the Hijri format (AH).
When converting from gregorian to hijri, you use the provided dropdowns to select the Hijri day, month, and year. The supported range for this mode is from the year 1343 AH to 1500 AH. The tool automatically adjusts the number of days available in the "Day" dropdown based on the specific month and year you select, preventing you from entering an invalid date (such as the 30th day of a 29-day month).
Calculate your age in hijri years
One of the most unique features of this tool is the built-in age calculator. If you enter a date that falls in the past—such as your birthday—the converter automatically assumes you might be looking for an age calculation.
Below the main conversion result, a secondary panel will appear showing your exact age. It calculates the difference between your entered date and today's date, displaying the result in years, months, and days. It does this for both calendar systems simultaneously.
You will notice that your age in Hijri years is higher than your Gregorian age. This is because the Islamic calendar is lunar, meaning a year lasts approximately 354 days instead of 365. Over time, this 11-day difference adds up. A person who is 32 years old in the Gregorian calendar will be celebrating their 33rd birthday in the Hijri calendar. If you need to calculate ages or time gaps using standard solar dates only, you can also use our dedicated Age Calculator or the Date Difference Calculator.
The Umm al-Qura calendar system
Converting between lunar and solar calendars requires a standardized mathematical model. This tool utilizes the umm al-qura calendar system, which is the official civil calendar of Saudi Arabia and the standard used by many Islamic organizations worldwide.
Historically, the start of a new Islamic month depends on the physical sighting of the new crescent moon. Because weather and geography affect visibility, the exact start of a month can vary by a day depending on where you are in the world.
To create a predictable civil calendar, the Umm al-Qura system relies on precise astronomical calculations. It defines the start of the month based on the sunset and moonset times at the coordinates of the Great Mosque of Mecca. If the moon sets after the sun on the 29th day of the previous month, the new month begins the next day. This ensures that historical dates, birth certificates, and administrative records remain consistent and can be converted back and forth without ambiguity.
Common use cases
Finding the Hijri Date Today: Many users check the tool daily to keep track of the current Islamic month and day, especially as important months like Ramadan, Shawwal, or Dhu al-Hijjah approach.
Converting Birthdays: Discovering your Hijri birthday is a common curiosity. Because the lunar calendar shifts by 11 days each solar year, your Hijri birthday will fall on a different Gregorian date every year.
Historical and Administrative Records: Many documents in the Middle East use the Hijri calendar. If you are translating a document, researching genealogy, or reading historical texts, this tool allows you to quickly translate those dates into the standard Gregorian timeline. If you are looking for traditional East Asian lunar conversions instead, see our Lunar Calendar Converter.