Hijri–Gregorian Date Converter: How It Compares to the Alternatives
Reviewed by the FreeOnline.fyi team · Updated 2026-09-09
When we built the [Hijri–Gregorian Date Converter](https://freeonline.fyi/hijri-
When we built the Hijri–Gregorian Date Converter at FreeOnline.fyi, we kept hearing the same pain point from Arabic-speaking users: switching between the two calendars is something you do dozens of times a year — to confirm when Ramadan starts, to fill in a passport form, to check whether a school break aligns with Eid — but every tool we tried either buried the result under three clicks, asked for a sign-up, or quietly got the weekday wrong. The converter was designed to fix that exact friction. Type the day, pick the month and year, and both calendars render side by side in under a second, with the localized weekday displayed under each date. No account, no network round-trip, no extra chrome.
Under the hood, the tool is a pure client-side conversion: the moment you change any of the day, month, or year fields, a small JavaScript routine maps the date through the Tabular Islamic Calendar algorithm — the same arithmetic basis used by most reference date libraries — and renders the result in a two-column card labelled Input and Result. The inputs accept Hijri years between 1300 and 1500 AH and Gregorian years between 1900 and 2100 CE, which covers everything from genealogical records to routine civil paperwork. A "Today" button auto-fills all fields from the current Gregorian date, and the segmented toggle at the top flips direction without losing the date you typed — useful when you're working from a printed invitation that reads, for example, "1 Shawwal 1446" and you want to know what that is on the Gregorian side.
We tested the converter against the alternatives our users mention most often: t
We tested the converter against the alternatives our users mention most often: the dedicated Hijri desktop apps for Windows, the mobile apps that bundle prayer times, and the well-known reference at timeanddate.com. The mobile apps win on notifications and moon-sighting reminders, but they almost always force you past an onboarding screen, request location permissions, and conflate date conversion with astronomical estimates that can differ from the tabular calendar by a day or two. The Hijri–Gregorian Date Converter, sitting inside our free online tools hub, deliberately stays tabular: what you type is what you get out, with no algorithmic opinion about when the new moon was actually sighted. For users in countries that follow a specific official calendar — Algeria, Morocco, and Tunisia each publish ministerial announcements — this distinction matters. The tool gives the algorithmic baseline; the local muhtasib gives the religious one, and you can compare the two.
A converter that's accurate 99% of the time is wrong 1% of the time, and for religious observances that is not good enough, so we want to be upfront about where this tool stops being authoritative. The Hijri calendar is lunar, which means an Islamic year is roughly 11 days shorter than a Gregorian one, and the start of each month is officially determined by moon sighting (rukyah) in many jurisdictions rather than by arithmetic. That means the converter is mathematically precise but not always religiously definitive: the Gregorian date it produces for, say, "1 Ramadan 1447" is the algorithmic answer, which may differ by a day from the date your local religious authority announces on the 29th of Sha'ban. For Hajj paperwork, visa applications, and other official documents we always recommend cross-checking against the issuing authority's stated date, and the Islamic calendar overview on Wikipedia is a solid starting point if you want to understand the underlying conventions.
In our own use, the three scenarios where the tool pays for itself fastest are:
In our own use, the three scenarios where the tool pays for itself fastest are: planning Ramadan iftar schedules weeks in advance, filling in birth certificates or national ID cards where the form asks for the Gregorian equivalent of your Hijri birth date, and answering the perpetual question of "what Gregorian date was Eid last year?" — because Islamic holidays drift earlier each solar year and the calendar math isn't intuitive. The dual readout, with both calendars shown simultaneously alongside the weekday, is particularly handy for that last case, since the weekday is often what people remember ("was Eid on a Friday?") and that anchors the rest of the search. If you also need to convert currencies for travel around those dates, our EUR to USD converter sits in the same toolbox.
We built the converter to be fast, self-contained, and respectful of the boundary between arithmetic and authority. For any date tied to a Hajj deadline, a court filing, or an exam schedule, treat the result as a strong starting hypothesis and confirm it against an official source — your country's ministry of religious affairs, the Saudi Umm al-Qura calendar for Gulf travel, or the relevant consulate's announcement. Math doesn't observe moons, and a tool that respects that boundary is, in our experience, more trustworthy than one that pretends the conversion is the final word.