Calculate your exact age in both the Hijri (Islamic) calendar and the Gregorian calendar from a single birth date, entered in whichever calendar you have it in.
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Because the Islamic Hijri calendar is purely lunar and the Gregorian calendar is solar, a person's age in each calendar is genuinely different, not just a relabeled version of the same number. This calculator computes both ages independently: your Gregorian age uses standard calendar-month arithmetic (accounting for 28-, 29-, 30-, and 31-day months and leap years), while your Hijri age uses the tabular Kuwaiti algorithm — the same conversion method used consistently across this website — applied directly to Hijri month lengths of 29 or 30 days. Working this way, rather than simply converting one finished age into the other, keeps both results precise down to the day. You can enter your birth date in either calendar, since many people only have a birth record in one of the two. The tool also shows your total days and weeks lived, a common way people mark milestones, and — when relevant — a note on the age many scholars associate with religious maturity (bulugh) in the absence of earlier physical signs, drawn from hadith narrations in Sahih al-Bukhari and Sahih Muslim.
Ask most people their age and they will give a single number, based on the Gregorian solar calendar most of the world uses for schooling, government records, and daily life. But for anyone who also thinks in terms of the Hijri (Islamic) calendar — for a religious birthday, a family record, or simple curiosity — that same lifetime maps onto a noticeably different number of Hijri years. This Hijri age calculator exists to answer that second question precisely, not just approximately.
The reason the two ages diverge comes down to how each calendar is built. The Gregorian year tracks the Earth's orbit around the sun and runs 365 or 366 days. The Hijri year tracks twelve lunar months and runs only 354 or 355 days — a gap of roughly 10 to 11 days every single year. That gap compounds steadily over a lifetime: a person's Hijri age in years typically overtakes their Gregorian age by one full year at around 33 Gregorian years old, and the difference keeps growing after that. Someone celebrating their 60th Gregorian birthday is often already past their 61st or 62nd Hijri birthday.
Many simple "Hijri age" tools take a shortcut: they calculate the Gregorian age first, then convert only the final result into an approximate Hijri figure. This calculator does the more rigorous version instead — it converts the birth date and today's date into the Hijri calendar independently using the tabular Kuwaiti algorithm, then works out the Hijri years, months, and days directly from actual Hijri month lengths, which alternate between 29 and 30 days across a repeating 30-year cycle. The Gregorian side of the calculation gets the same care, using the real number of days in each calendar month rather than a flat average. The result is a Hijri age that is accurate to the day, not just a rough estimate.
Because family records, older identity documents, and some countries' official paperwork record a birth date in the Hijri calendar rather than the Gregorian one, this calculator also accepts a Hijri birth date directly — day, month, and year — and works out both ages from there, without requiring you to convert it yourself first. Whichever calendar your birth date is recorded in, the same precise, independent arithmetic runs behind the scenes in both directions.
As with every Hijri calculation on this site, keep in mind that the tabular method is a well-established mathematical estimate, closely tracking the moon's average cycle, rather than a record of an actual crescent sighting on a specific evening. For everyday use — marking a Hijri birthday, understanding your religious-calendar age, or simply satisfying curiosity about the gap between the two systems — this level of precision is exactly what's needed.
The Hijri (lunar) year is about 11 days shorter than the Gregorian (solar) year, so your Hijri age in years grows slightly faster than your Gregorian age. By around age 33 Gregorian, your Hijri age is usually about one full year ahead.
Yes. Switch the birth date format to Hijri and enter the day, month, and year exactly as they appear on a Hijri birth certificate or family record, and the calculator converts and computes both ages from that.
It uses the tabular Kuwaiti algorithm, the same method used across this website for Hijri conversions, and computes the Hijri years, months, and days independently rather than estimating from the Gregorian result. It can differ by about a day from a calendar based on local moon sighting.
Physical signs of puberty are the primary marker in Islamic law. Absent those signs, many scholars take 15 lunar (Hijri) years as the latest presumed age of religious maturity, based on hadith narrations in Sahih al-Bukhari and Sahih Muslim. This is general information, not a personal religious ruling.
No. The calculation runs entirely in your browser using client-side JavaScript. Your birth date is never uploaded, logged, or sent to any server.