However, despite the proliferation of television shows about unwanted pregnancies, planning requires knowledge of your cycle, including knowing when you will ovulate. Despite the pain and discomfort that menstruation can cause for many women, it signifies the ability to produce a new life. There is something miraculous about a woman's reproductive system. Babies born more than 10 days after are post-mature. Babies born more than 10 days before are pre-mature.

20% of babies are born outside the normal 10-day window.

80% of babies are born within 10 days of the predicted day.

It is useful if you did not keep track of your periods or do not remember the date of your last menstrual period.

Ultrasound can predict your date more accurately in early stages of pregnancy.

Only about 5% babies are born on their actual EDD.

The average length of luteal phase in women is 14 days and does not usually vary by more than a day from person to person. Luteal phase is the part of the cycle that starts at ovulation and ends the day before your next period. What is average cycle length?Ĭycle length is the length of a woman's menstrual cycle.

First day of LMP can be used to calculate a baby's EDD.

The above tool makes it easy to adjust for these sorts of shift by letting you specify your information. However, things can get complicated if your cycle length is not 28 days or if your luteal phase length is not 14 days. If you know when conception happened then just add 266 days (or 38 weeks). Simply add 280 days (or 40 weeks) to the first day of your last period. Pregnancy FAQs How do you calculate your estimated delivery date?Īre you wondering 'when am I due'? The basic formula to calculate it is very simple and works great if your average cycle length is 28 days.

Babycenter due date calculator