Calculate your exact age in years, months, and days from your date of birth — with an automatic Hijri (Islamic) calendar age conversion.
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This tool calculates your exact age in years, months, and days based on your Gregorian date of birth and today's date, with an automatic side-by-side conversion to your age in the Hijri (Islamic) calendar. It uses the tabular Kuwaiti algorithm to convert Gregorian dates to Hijri — the same algorithm used elsewhere on this site for Hijri date conversions — to keep results consistent across every tool on the site. The difference in years, months, and days is calculated independently and precisely for each calendar, accounting for the actual number of days in each month (28-31 days in the Gregorian calendar, 29-30 days in the Hijri calendar), rather than a rough estimate based on average year length. The tool also shows the total number of days and weeks you have lived since birth, a popular piece of information for anyone who wants to mark a special milestone (such as reaching 10,000 days old). The Hijri conversion specifically relies on the tabular Kuwaiti algorithm, a well-documented mathematical method for converting between the Gregorian and Islamic calendars that is widely referenced in Islamic calendar-calculation literature and used by many Hijri date-conversion tools without needing live moon-sighting data.
Knowing your exact age sounds like a simple thing, until you try to work it out by hand across multiple months and leap years — and for many Muslims, there is a second question layered on top: what is that same age in the Hijri calendar? This calculator answers both at once, from a single date of birth.
The Gregorian side of the calculation compares your birth date to today's date and works out the precise gap in years, months, and days, correctly handling the different lengths of each month and leap years along the way, rather than relying on a rough 365.25-day average. Alongside that, it shows your total days lived — a number some people like to track for milestone reasons, such as celebrating a 10,000th or 20,000th day of life.
The Hijri conversion is where this tool goes further than a typical age calculator. Because the Islamic calendar is lunar, its year is roughly 11 days shorter than the Gregorian solar year. Over a lifetime, this gap adds up meaningfully: a person's Hijri age in years will typically run noticeably higher than their Gregorian age by the time they reach older adulthood. The conversion here uses the tabular Kuwaiti algorithm, a standard computational method for mapping Gregorian dates to their Hijri equivalents, which makes it possible to calculate a Hijri age instantly for any birth date without needing access to historical moon-sighting records.
It is worth understanding the nature of that method, though: tabular algorithms like this one are mathematical approximations built on the average length of a lunar month, and different Islamic countries and institutions sometimes observe the start of a Hijri month a day earlier or later based on local moon-sighting practices. That means a date calculated this way can occasionally differ by a day from the date officially observed in a specific country. For everyday purposes — knowing your approximate Hijri age, or getting a same-day Hijri date for general reference — this kind of tabular calculation is accurate and widely used. For precise religious or legal purposes tied to a specific country's official calendar, it's worth cross-checking against that country's published Hijri calendar.
Because both calculations run from the same single date of birth, you get a complete picture — Gregorian age, Hijri age, and total days lived — in one step, without switching between separate tools or doing any calendar conversion math yourself.
The Hijri (lunar) year is about 11 days shorter than the Gregorian (solar) year, so your Hijri age in years will usually be slightly higher than your Gregorian age.
It's calculated using the tabular Kuwaiti algorithm, a widely used mathematical approximation. It may differ by a day or two from a Hijri date based on actual moon sighting in some countries.
Yes, simply enter their date of birth — the calculator works for anyone's date of birth, not just your own.
Tabular algorithms like the one used here are based on the average length of a lunar month, while some countries officially confirm the start of each Hijri month through moon sighting — which can shift the official date by a day.