How Old Are You in Hijri Years? Lunar Age Explained

Your age in Hijri years is the number of complete Islamic lunar years since your birth, counted on the Hijri calendar. Because a Hijri year is about 11 days shorter than a Gregorian year, your Hijri age runs ahead of your Gregorian age: by about 3%, or one extra year for every 32.6 years of life. A 33-year-old is usually 34 in Hijri years, and someone in their late 60s is usually two years "older." To get an exact answer, convert your birth date to its Hijri date and count the complete Hijri years up to the date you care about.

Key Takeaways

• A Hijri year averages about 354.37 days and a Gregorian year 365.2425 days, so Hijri age ≈ Gregorian age × 1.0307.
• You gain one extra Hijri year roughly every 32.6 Gregorian years.
• Your Hijri birthday arrives about 11 days earlier in the Gregorian calendar each year.
• For most people the difference is a curiosity. It matters when a rule is written in Hijri years, such as Saudi Arabia's Juveniles Law.

Why your Hijri age is higher

The Hijri calendar counts years by the moon. The Quran describes the moon's phases as a way of reckoning time; Surah Yunus 10:5, in a translation of the meaning (Dr. Mustafa Khattab, The Clear Quran, on quran.com), says this is "so that you may know the number of years and calculation ˹of time˺."

A Hijri year is 12 lunar months. NASA's page on the Moon's orbit gives the mean synodic month, from one new moon to the next, as 29.53059 days. Twelve of those make 354.367 days. The Gregorian calendar, by contrast, averages 365.2425 days a year, as Encyclopaedia Britannica's entry on the Gregorian calendar explains. The US Naval Observatory's Islamic calendar page rounds the difference to 11 days a year.

Dividing one year length by the other gives the ratio:

• 365.2425 ÷ 354.367 = 1.0307
• So one Gregorian year holds about 1.0307 Hijri years.
• The extra 0.0307 adds up to a whole Hijri year after 1 ÷ 0.0307 ≈ 32.6 Gregorian years.

Real Hijri years are 354 or 355 days long, not a fractional 354.367, and calendars that follow the moon do not repeat a fixed pattern. The ratio is an average. For an exact age you need actual dates, which is why the worked examples below use a converter rather than the formula. Why the year has 354 or 355 days is covered in how many days are in a Hijri year.

A quick estimate

Multiply your Gregorian age by 1.0307 for a rough answer, or simply add one year for every 32.6 years:

These figures assume average year lengths. Whether your completed Hijri age is the higher whole number depends on where your birthday falls, so treat the table as a guide, not an answer.

Worked examples

The examples below count complete Hijri years from the birth date to Monday 9 November 2026, which is 29 Jumada al-Awwal 1448 AH. Dates are calculated from the Umm al-Qura tables in the open-source @tabby_ai/hijri-converter library that this site uses. Local announcements of the start of a month can differ by a day.

Example: born 15 March 1990

A person born on 15 March 1990 was born on 18 Sha'ban 1410. On 9 November 2026 (29 Jumada al-Awwal 1448), their last Hijri birthday was 18 Sha'ban 1447, which fell on 6 February 2026. That makes them 1447 − 1410 = 37 in Hijri years, against 36 in Gregorian years.

Their next Hijri birthdays fall on:

Each one comes 11 or 12 days earlier in the Gregorian calendar than the last, because each gap is 354 days: twelve lunar months, not a solar year. Over a lifetime this slide carries a Hijri birthday through every season.

Example: when the extra year shows up

The gap between the two ages is not always the same for people of similar age. The person born on 9 November 1993 has had exactly 33 Gregorian years and is 34 in Hijri years, just past the 32.6-year point where a full extra year has built up. The person born on 1 September 2010 is 16 in both calendars: at about 16.2 Gregorian years they have lived about 16.7 Hijri years, not enough for a 17th Hijri birthday yet. Below about 32.6 years, whether your two ages differ depends on where in the year your birthday falls.

How to do it yourself

1. Convert your Gregorian birth date to a Hijri date with the Hijri date converter.
2. Convert the date you care about (for example, a deadline) the same way.
3. Subtract the Hijri birth year from the Hijri target year.
4. If the target's Hijri month and day come before your birth month and day, subtract one more year.

A step-by-step guide to finding the date itself is in how to find your Hijri birthday.

Born in the evening?

The Islamic day begins at sunset, not at midnight. The US Naval Observatory's Islamic observances service notes that its dates "begin at sunset of the previous evening." A converter matches a whole Gregorian day to a single Hijri date, so if you were born after sunset, your Hijri birth date is strictly the next day's date. For a birth on 1 January 2000 after sunset, that would be 25 Ramadan 1420 rather than 24 Ramadan. This rarely changes your age in years, but it can move the birthday itself. The reason the day begins at sunset is explained in why the Islamic day begins at sunset.

When the difference matters

For most purposes, your Hijri age is a curiosity, because most official records and most countries' laws count age in Gregorian years. The difference starts to matter when a rule is written in Hijri years and sits near a threshold.

Laws that count in Hijri years

Saudi Arabia's Juveniles Law is one example. Saudipedia's summary of the law, published under the Saudi Ministry of Media, says a juvenile is anyone who has reached seven but not yet turned eighteen, and that "the age is calculated based on the Hijri calendar, as recorded in any official document."

Near a threshold like 18, the gap is about six and a half months. Take someone born on 1 September 2008, which is 1 Ramadan 1429 by the calculated calendar. Their 18th Hijri birthday, 1 Ramadan 1447, fell on 18 February 2026. Their 18th Gregorian birthday was 1 September 2026, 195 days later.

The reverse also happens: laws can move from lunar to Gregorian years. The United Arab Emirates' new Civil Transactions Law, which The National reported came into effect on 1 June 2026, lowers the age of majority from 21 lunar years to 18 Gregorian years. By the average ratio, 21 lunar years is about 20.4 Gregorian years.

Legal rules change, and each one has its own wording and exceptions. If an age limit affects you, check the current text with the relevant authority rather than relying on a calculation alone.

Religious questions

Many Islamic obligations depend on reaching maturity rather than on a birthday. In Sahih al-Bukhari 2664, placed in the chapter on boys reaching puberty, Ibn Umar narrates that the Prophet ﷺ did not allow him to join the Battle of Uhud at fourteen but allowed him at the Battle of the Trench at fifteen. The narrator Nafi' adds that the caliph Umar ibn Abd al-Aziz, on hearing this, called fifteen the limit between childhood and adulthood.

How scholars apply ages like this one, and how maturity is determined, are questions of fiqh on which the schools of law have their own positions. For a personal question, ask a qualified scholar or your local mosque.

A related but separate case is zakat. The zakat year (hawl) is counted in lunar years, not in years of age, and is covered in tracking your hawl with a Hijri calendar.

When it does not matter

If a form asks for your age and does not mention the Hijri calendar, it almost certainly means your Gregorian age. Even where Hijri dates appear on documents, check which calendar a specific rule uses before assuming.

Find your own Hijri age

Enter your birth date in the Hijri date converter to get your Hijri birth date, then compare it with the current month on the 1448 AH Hijri calendar to see how many Hijri birthdays you have had. The converter uses the calculated Umm al-Qura calendar, so a date announced locally may differ by a day, and a birth after sunset belongs to the following Hijri date.