How is expected date of delivery calculation

The educational health content on What To Expect is reviewed by our medical review board and team of experts to be up-to-date and in line with the latest evidence-based medical information and accepted health guidelines, including the medically reviewed What to Expect books by Heidi Murkoff.

This educational content is not medical or diagnostic advice. Use of this site is subject to our terms of use and privacy policy. Registry Builder New. Due Date Calculator When is your baby due? Use this pregnancy calculator to find your due date based on the date of your last menstrual period, conception date, IVF 3-day or 5-day transfer date or date of your last ultrasound.

Calculation Method. The first day of your last period. Date of Conception. Date of Transfer. Date of Ultrasound. Using breast milk for eczema is a popular home remedy. Here's what the research says about acupuncture for your morning sickness.

Pumping shouldn't hurt. If your nipples are painful or sore, there are there are things you can do. Learn what to expect during your first prenatal visit. Health Conditions Discover Plan Connect. Medically reviewed by Debra Rose Wilson, Ph. How to calculate Don't know date of last period Irregular periods Doctor changes due date Ultrasound date Sources Overview.

How can I calculate my due date? What if I have irregular periods or long cycles? What does it mean if my doctor changes my due date? What is the ultrasound date, and why is it different from my due date? Article sources. Parenthood Pregnancy 1st Trimester.

Placenta Delivery: What to Expect. Read this next. There is a total of 1 error s on this form, details are below. Please select your last menstrual period.

We can't calculate your due date accurately if the date entered for your last menstrual period is more than 9 months ago or is in the future. First day of your last menstrual period LMP : error: This date is invalid Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Please remember that the result will not necessarily be the day that your baby arrives.

The actual date may be any time from 38 to 42 weeks in most pregnancies. If problems occur you may be advised that delivering your baby earlier is the safest option.

For advice on recognising signs that you are going into labour , or for information on some types of pain relief in labour, follow the links. We also have information on how your baby is monitored in labour.