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Hijri year age calculator

Work out an age from a year of birth alone, on either calendar. The answer is the two ages it could be, because a year without a day cannot give one.

Year of birth

Which calendar the year is on

The year alone. This tool is for when the day is not recorded

Defaults to today

Calendar reckoning

Tabular variant
Shift the result, in days

If the calendar where you are reads a day ahead of what this gives, set +1. The shift applies to every date the tool produces.

These dates are calculated, not announced

Islamic months begin on the sighting of the new crescent, announced locally. A converted date comes from a fixed arithmetic calendar instead, so it can differ from the observed one by a day in either direction, and countries differ from each other.

Saudi Arabia’s official Umm al-Qura calendar is a third scheme again. It is published as a table rather than derived from a formula, so it is not computed here.

Age in Hijri years

Enter a year of birth and the possible ages appear here.

When the year is all you have

A great many birth records give a year and nothing else. Older documents often did not record the day, and in places where births were registered annually the year is the only figure that was ever written down. This tool is built for that case rather than pretending it does not happen.

Why the answer is two numbers

Age changes on a birthday. If the birthday has already come round this year you are one age; if it has not, you are a year younger. A year of birth on its own cannot say which side of that line you are on, so there are always exactly two possible answers, and this tool gives both.

Most calculators quietly subtract one year from the other and print a single figure. That figure is right about half the time. Showing the range is less tidy and considerably more honest.

Narrowing it down

Any information about the month resolves it. If the birth was in the first half of the Hijri year, the higher figure is almost certainly the right one; if it was late in the year, the lower. If you have the full date, use the Islamic age calculator instead, it returns one answer.

A Gregorian year of birth is a wider net

The two calendars do not line up, so one Gregorian year straddles two Hijri ones. Entering 1990 tells the tool the birth falls somewhere in a window that crosses a Hijri year boundary, which is a larger area of uncertainty than a Hijri year would be. The answer is still narrowed to two possible ages, but the underlying window is wider.

The usual reason people need this

Nearly always a form: a document gives one calendar and something else wants the other. Where that matters officially, the authority asking usually has its own conversion rule, and it may not be the one used here. Take this as a working figure, not as a number to put on a legal document without checking.

Questions

Why does this give two ages instead of one?
Because a year on its own does not contain enough information for one. Someone born early in a year has already had their birthday by now; someone born late in the same year has not, and is a year younger. Without the day and month there is no way to tell which, so both answers are given. A single number would be a guess presented as a fact.
I know my full date of birth. Should I use this?
No, use the Islamic age calculator instead. It takes a complete date and returns one age rather than a range. This tool exists for the common case where only the year was ever recorded, which happens a great deal on older documents and in places where births were registered by year.
Why does a Gregorian year of birth give a wider spread?
Because one solar year overlaps two lunar ones. A Gregorian year that begins in one Hijri year ends in the next, so saying "born in 1990" locates the birth inside a window that crosses a Hijri year boundary. The tool still narrows it to two possible ages, but it has more ground to cover.
How do I turn the range into a single age?
Find the month. Even an approximate month is usually enough: if you know the birth was in the first half of the year, the higher figure is almost certainly right, and if it was late in the year, the lower one is. Only the exact day settles it completely.
Which figure should I put on a form?
Whichever one the document you are working from supports, and say that it is approximate if the form allows. If an authority holds a Hijri year of birth and wants a Gregorian age, they usually have their own conversion rule, ask them rather than assuming this one matches it.

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