How does the dual-calendar age calculator work?
This tool calculates your age in both the Hijri and Gregorian calendars at the same time, from a single birth date entered in whichever calendar you prefer. The conversion between calendars relies on a dedicated API, with a local in-browser fallback if it cannot be reached.
Because a Hijri year is about 11 days shorter than a Gregorian one, your Hijri age is numerically slightly higher than your Gregorian age, even though both describe the same actual span of time.
Why do the two numbers differ for the same person?
| Hijri year | Gregorian year | |
|---|---|---|
| Approximate length | 354 days | 365 or 366 days |
| Years elapsed at Gregorian age 30 | ~31 Hijri years | 30 Gregorian years |
The gap grows by roughly one extra Hijri year every 33 Gregorian years — a natural result of the two calendars' different year lengths, not a calculation error.
How accurate is the result?
A margin of one or two days on the converted Hijri birth date If you enter your birth date in the Gregorian calendar, the corresponding Hijri date is an approximation and may differ by a day or two from official records, if any exist, due to differing methods of determining the start of a lunar month.
How to work out your Hijri age by hand
Hijri age ≈ Gregorian age × 1.03, because a Hijri year is about 11 days shorter.
- Gregorian age 20 ≈ 20.6 Hijri years
- Gregorian age 30 ≈ 30.9 Hijri years
- Gregorian age 40 ≈ 41.2 Hijri years
- Gregorian age 60 ≈ 61.8 Hijri years
Or subtract your Hijri birth year from the current Hijri year (1448 AH). Example: someone born in 1410 AH is about 1448 − 1410 = 38 Hijri years old.
Birth year table: Gregorian to Hijri
Most Gregorian years overlap two Hijri years, so your Hijri birth year depends on your birth month.
| Birth year (Gregorian) | Matching Hijri year |
|---|---|
| 1970 | 1389 – 1390 AH |
| 1975 | 1395 AH |
| 1980 | 1400 – 1401 AH |
| 1985 | 1405 – 1406 AH |
| 1990 | 1410 – 1411 AH |
| 1995 | 1415 – 1416 AH |
| 2000 | 1420 – 1421 AH |
| 2005 | 1425 – 1426 AH |
| 2010 | 1431 – 1432 AH |
| 2015 | 1436 – 1437 AH |
| 2020 | 1441 – 1442 AH |
Frequently asked questions
Which is "more correct" — my Hijri age or Gregorian age?
Both are correct; the difference is only in the counting system. Your age in actual elapsed time is one single span, but the number of "years" differs because a Hijri year is not the same length as a Gregorian year.
Can I enter my birth date directly in Hijri?
Yes, choose "Hijri" from the input calendar options and select the Hijri day, month and year directly.
Why is there a small difference between my own calculation and the tool's?
A one- or two-day difference is normal and comes from the Hijri conversion being an approximation rather than always being based on actual moon sighting.
Is my data stored?
No, the calculation happens in your browser via a date-conversion request that carries no identifying information about you, and no personal data is stored.
How old am I in Hijri years if I am 30?
About 30.9 Hijri years, so 30 or 31 depending on your birthday. Multiply your Gregorian age by 1.03 for a quick estimate.
What Hijri year was I born in?
Enter your Gregorian birth date in the calculator above and your Hijri birth date appears, or check the birth year table on this page.
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