Hijri to Gregorian Converter 2026، Interactive Tool & Full Guide

Arabic-speaking users convert between Hijri and Gregorian dates every day، filling out a form, planning leave, or scheduling an official appointment. The tool below converts between both calendars using the Umm al-Qura data officially adopted in Saudi Arabia.

How does the tool work?

The tool relies on the Intl.DateTimeFormat API in modern browsers with the islamic-umalqura option، the same official data used by the Umm al-Qura calendar in Saudi Arabia. No server, no internet connection required, and your data is never shared.

The core difference between the two calendars

| Criterion | Hijri calendar | Gregorian calendar | |---|---|---| | Basis | Moon's cycle around Earth | Earth's orbit around the sun | | Days per year | ~354 days | 365 (or 366 in a leap year) | | Start of the year | 1 Muharram | 1 January | | Epoch | Migration of the Prophet ﷺ (622 CE) | Birth of Christ | | Start of the day | At sunset | At midnight | | Fixed seasonal months | No، months rotate through the year | Yes، each month stays in its season |

Quick conversion using the approximate formula

To convert between years only (without day and month):

• Hijri → Gregorian: G ≈ H × 0.97 + 622
• Gregorian → Hijri: H ≈ (G − 622) × 1.03

Example: 1447 AH ≈ 1447 × 0.97 + 622 ≈ 2025/2026 CE

Note: This formula is approximate and only for the year. For an exact date (day and month), use the tool above.

Official conversion tools

1. The Umm al-Qura website، most accurate for Saudi Arabia

• Link: ummulqura.org.sa
• The officially adopted calendar in the Kingdom of Saudi Arabia
• Set by astronomical calculation at the King Abdulaziz City for Science and Technology (KACST)

2. The calendar app on your phone

• iPhone: Settings → General → Language & Region → Calendar → "Islamic, Umm al-Qura"
• Android: When adding an event, select "Hijri calendar"

3. Google Calendar

Supports the Hijri calendar as a secondary calendar:

• Settings → Add calendar → Browse → "Islamic Days".

Common Mistakes

1. Relying on unofficial websites

Some websites use a different calendar than Umm al-Qura, producing a gap of one or two days. For official use، documents, contracts, government appointments، rely only on Umm al-Qura.

2. Confusing when the day begins in each calendar

In the Hijri calendar, the day starts at sunset (not midnight). That is why "1 Ramadan" effectively appears at maghrib on the preceding Gregorian day in astronomical tables.

3. Hijri months are not a fixed length

Each Hijri month is either 29 or 30 days, set by moon sighting in religious practice (and by astronomical calculation in Umm al-Qura). Converting a mid-month date can therefore differ by a day between sources.

When does precise conversion matter?

• Official contracts: The date is written in the calendar adopted by the issuing authority.
• National ID: The Hijri date of birth is fixed for life، verify its conversion carefully.
• Medical appointments: Some hospitals schedule appointments in Hijri; verify before booking.
• Exam dates (Qudurat / Tahsili): The Education & Training Evaluation Commission publishes dates in both calendars.

Summary

• For daily conversion: Use the tool above or your phone's calendar app.
• For official use: Rely only on ummulqura.org.sa.
• Remember: The Hijri year is 11 days shorter، don't treat it as equal to the Gregorian year.

Read also: Age Calculator، Gregorian and Hijri · When is Payday? Saudi Salary Schedule