How is expected due date calculated

This is an estimated date of when your baby is due. Babies rarely keep to an exact timetable, so your full-term pregnancy can be anywhere from 37 and 42 weeks. Video call. This information is for your general information and use only and is not intended to be used as medical advice and should not be used to diagnose, treat, cure or prevent any medical condition, nor should it be used for therapeutic purposes.

The information is not a substitute for independent professional advice and should not be used as an alternative to professional health care. If you have a particular medical problem, please consult a healthcare professional. Next, count back 3 calendar months from that date. Lastly, add 1 year and 7 days to that date. You may also estimate your delivery date by using the steps 1 and 2 and the chart: First, locate the first day of your last menstrual period in black text.

Next, note the date directly below. This is your estimated date of delivery in blue text. Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date. If you already know your due date, you can use this calculator to see your pregnancy calendar.

It will tell you when you'll hit various milestones, like when your baby's heart starts beating, and when you may be due for prenatal tests and prenatal care. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date. Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife.

Only 1 in 20 women delivers on her due date. You're just as likely to go into labor any day during the two weeks before or after. Want more information about how the weeks, months, and trimesters of pregnancy are counted?

See our pregnancy timing chart. BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals.

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Choose a calculation method Last period Conception date I know my due date. First day of my last period. See your timeline. Sources BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. Methods for Estimating the Due date. American College of Obstetricians and Gynecologists. Committee Opinion.