How to Calculate EDD in Pregnancy


After confirming pregnancy, one of the primary concerns for expectant mothers is determining the anticipated arrival date of their child. It is known as the Estimated Due Date (EDD), a significant milestone in tracking the growth and development of the fetus during pregnancy.

However, since each person's body is unique and every menstrual cycle varies, it can be challenging to calculate the EDD accurately. But is there any EDD calculation formula to get the accurate date? Let’s understand it in detail below!

Why Calculating EDD in Pregnancy is Important?

It isn’t necessary to have an accurate and perfect calculation despite the methods of the EDD calculator online. Pregnant women often give birth weeks or days before or after the due date.

However, since your pregnancy journey comes with many unexpected aspects, the estimated due date will help you track the growth of the fetus and create a timeline to perform necessary tests and diagnosis.

Ways to Calculate EDD in Pregnancy

  • EDD Based on the Last Menstrual Period (Naegele's Calculation)
Typically, a pregnancy lasts 40 weeks or 280 days, starting from the first day of the last menstrual period. To know your due date using this LMP EDD calculator, you can use a EDD calculator online which requires the input of the average length of your menstrual cycle. This will help give you an estimated due date in the ongoing pregnancy stages for the arrival of your baby.
  • EDD Based on the Date of Conception (Mittendorf-Williams Calculation)
This method of EDD calculator in pregnancy finds the due date is done by tracking the ovulation cycle and using the conception date to know how far away you are. Then, you just have to add a gestation period of 266 days or 38 weeks from the date of conception.
  • EDD Based on Ultrasound
Ultrasounds or sonograms provide more accurate due dates when compared with other methods. Your healthcare can perform it between 11-14 weeks gestational period. The gestational time is predicted by analyzing the size and developing parts of the fetus.

Final Words

Is your EDD near? Then it's time to make critical decisions to store the valuable resource for your little one. At Cryoviva, we implement cutting-edge technologies and follow standardized care for umbilical cord preservation, with the ultimate goal of restoring their health and vitality in case of any future medical emergencies.

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