Your age in the Islamic calendar
Because the Hijri lunar year is about eleven days shorter than the solar year, your age in Hijri years is slightly higher than in Gregorian years - by roughly one extra year every thirty-three. This tool gives your exact Hijri age and your Hijri date of birth.
How it is calculated
Your Gregorian date of birth is converted to its Hijri date using the Umm al-Qura calendar, then compared with today's Hijri date to give your age in Hijri years, months, and days. As with any Hijri date, the calculated day can differ by one from a local moon sighting.
Why it is useful
Knowing your Hijri age ties your life to the Islamic calendar - helpful for noting when a child reaches the age of religious responsibility (buloogh), and for milestones linked to the lunar months.