- Hijra-Gregorian date converter
- Must enter day, month, and year
ULB Sachsen-Anhalt Gregorian-Hijri year converter
- Only converts years. Uses a set formula to provide a one-to-one correspondence between Gregorian and Hijra calendars. Rough, but helpful if you only have the year.
Islamic/Christian Calendar Converter at MELA
- Converts "Christian" to "Islamic" dates and vice versa, apparently taking into account the shift from the Julian calendar.
- Easy interface, showing both dates simultaneously.
- Displays Julian day
- Handy guide to the months of the Islamic calendar
Tarih Çevirme Kılavuzu at the National Library of Turkey
- Converts Gregorian (Miladi), Hijri, and Julian (Rumi) dates
- Only through mid-1925 CE
- In Turkish