The hijrian and gregorian electronic obstetrical calendar

الملخص EN

Naegele's rule and obstetrical wheels have been used for many decades as tools to calculate the expected date of delivery.

Reviewing the literature, it was found that pregnancy wheels provided by drug companies have margin error that could reach five days.

This electronic obstetrical calendar reconfirms Naegele's rule and at the same time adds a new rule in order to calculate the expected date of delivery when using the Hijrian date compared to the traditional pregnancy wheels.

This electronic calendar is simple to use, more accurate and very helpful, particularly to physicians and patients who live in Arab countries where the Hijrian calendar is used as the official calendar.