The Islamic (Hijri) calendar is lunar, with years of about 354 days. Because each lunar year is roughly 11 days shorter than a solar year, your age counted in Hijri years is a little higher than your usual age. This guide explains how to calculate your age in Hijri years and how our International Age Calculator and Islamic Date Today (Hijri Converter) converter help.
Why Hijri age is higher
A Hijri year averages about 354.37 days, while a Gregorian year averages 365.24 days. Over 33 solar years, about 34 lunar years pass. So a 33-year-old has lived roughly 34 Hijri years.
The quick formula
Hijri age ≈ days lived ÷ 354.37
Or, roughly:
Hijri age ≈ Gregorian age × 1.0307
Examples
| Gregorian age | Approximate Hijri age |
|---|---|
| 10 | 10.3 |
| 25 | 25.8 |
| 33 | 34.0 |
| 50 | 51.5 |
| 63 | 64.9 |
Your Hijri birthday
Convert your birth date into the Islamic calendar with the Hijri date converter. Your Hijri birthday moves about 11 days earlier each Gregorian year, so over a lifetime it cycles through every season.
Why it matters
- Some Islamic rulings depend on reaching puberty or a certain age, and scholars discuss age in lunar years.
- Zakat is due after a full lunar year of holding wealth; see the Zakat Calculator.
- Many people simply enjoy knowing their Islamic birthday.
A note on moon sighting
Calculated Hijri dates use the Umm al-Qura calendar. In Pakistan, months begin after local moon sighting, which can shift dates by a day. For age purposes, this difference is negligible.
Other age systems
The international age calculator also shows Korean age and age in other time zones; read Korean age explained.
Converting age in months
You can also count age in lunar months. A Hijri month is about 29.53 days, so someone 30 years old has lived roughly 371 lunar months compared with 360 solar months. Small differences like this add up, which is why Islamic dates of birthdays, anniversaries and Ramadan move through the seasons over the years.
Recording your Islamic birth date
If you do not know your Hijri date of birth, convert it once and write it down with your other important dates. Many families like to note children’s Islamic birthdays alongside their usual ones.
Frequently asked questions
How do I calculate my age in Islamic years?
Divide the number of days you have lived by about 354.37.
Why is my Hijri age higher than my normal age?
Lunar years are about 11 days shorter than solar years.
How often does my Hijri birthday move?
It comes about 11 days earlier each Gregorian year.