What is your exact age, and how do we count it?
Your age in years is simply how many full Earth-around-the-Sun trips you've completed since you were born. The hard part is the leftover months and days. We compute the calendar difference: how many full calendar years separate your birth from today, then how many full months, then the days. This is how birthdays work in everyday speech - a person born on 15 March 2000 turns 25 on 15 March 2025, regardless of leap years in between.
Using the Gregorian (Miladi) calendar
The Gregorian calendar is the international civil standard, used in virtually every country for daily life. It has 365 days a year and 366 in a leap year, with 12 months of fixed length (28–31 days). If your birth certificate or ID is in this calendar, choose 'Gregorian' at the top of the calculator and enter the day, month, and year you were born. The calculator handles all leap-year edge cases (February 29 in particular).
Using the Hijri (Islamic) calendar
The Hijri calendar is the religious calendar of the Muslim world and the official civil calendar of Saudi Arabia. It has 12 lunar months totaling about 354 days a year - roughly 11 days shorter than the Gregorian year. If your birth certificate is recorded in Hijri (year ~1340 onward), pick 'Hijri' at the top and enter the day, month, and year. The calculator will compute your age and also show your birth date in the Gregorian calendar.
Why your Hijri and Gregorian ages differ slightly
A Hijri year is shorter than a Gregorian year by roughly 11 days. Over a long lifetime that adds up: someone born around 1980 in the Gregorian calendar will accumulate about one extra Hijri year per 33 years lived. So at age 33 Gregorian you are 34 in the Hijri calendar; by age 66 you are 68 Hijri. The calculator displays both so you can use whichever one matches the document you need.
Your zodiac sign - derived from your Gregorian birth date
Astrological zodiac signs are tied to the Sun's position relative to a constellation on a fixed Gregorian calendar grid: Aries (Mar 21–Apr 19), Taurus (Apr 20–May 20), and so on. The calculator auto-detects your sign from the Gregorian birth date - even when you entered the Hijri version. This is a cultural / entertainment feature, not a scientific claim.
Privacy and accuracy
Everything happens in your browser. We don't send your birth date to any server, and we don't store it. If you refresh the page, the calculator forgets. The Hijri conversion uses the standard tabular Islamic calendar algorithm, which can differ from the Saudi Umm al-Qura observational calendar by ±1 day on some dates - well within tolerance for age, but if you need an exact Hijri date for a legal document, cross-check with the official Umm al-Qura source.
Frequently asked questions
A Hijri year is about 11 days shorter than a Gregorian year. Over a lifetime that adds up to roughly one extra Hijri year for every 33 Gregorian years lived. So someone who is 33 in the Gregorian calendar is 34 in the Hijri calendar, and at 66 Gregorian they are 68 Hijri.
We use the standard tabular Islamic calendar - the same algorithm used by astronomy reference works. It can differ from the Saudi Umm al-Qura observational calendar by ±1 day on certain dates. For age calculation that's a negligible difference, but if you need a precise Hijri date for a legal document, cross-check with the official Umm al-Qura source.
Because a regular year has 365 days, which is 52 weeks plus 1 extra day. So your birthday's weekday advances by one day each non-leap year and by two days after a leap year. The calculator shows you the actual day of the week you were born - that one doesn't change.
Yes. Just enter their birth date instead of yours. Useful for parents tracking a child's exact age in months and days, or for figuring out the age difference between siblings or partners (try our Age Difference calculator for that).
No. The calculation runs entirely in your browser. Nothing is sent to a server, nothing is stored. Refresh the page and the calculator starts fresh.
Sources
- Umm al-Qura Calendar— King Abdulaziz City for Science and Technology (KACST)
- Tabular Islamic Calendar - Astronomical Algorithms— Jean Meeus, Astronomical Algorithms (2nd ed.)
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