When Am I Due?

If you have recently discovered that you are pregnant, then you, like many women, are probably wondering when am i due.

Of course, when you visit your doctor, he or she will calculate your due date, but in the mean time, you can use the simple formula in this article to calculate when you will be due with a reasonable degree of accuracy.

40 Weeks

The simplest way to figure out the answer to the question ‘when am I due,’ is to simply add forty weeks to the first day of your last period. Alternatively, you could count two hundred and eighty days from that date, and you should know, to within a week or two, when you are due to deliver.

Not an Exact Science

Of course, even once you have answered the question, when am I due, or even if your doctor has given you a due date, you need to remember that it is not an exact science. In fact, as many as eighty percent of babies are not born on their due dates. Most will; however, be born within ten days of that date, so it makes planning for your baby a lot easier!

Early or Overdue

While many babies will be born within ten days of their due date, however, there are many that are not. About ten percent will deliver early (anytime between week 20 and week 36), and another ten percent will deliver late (up to the forty second week.)

If you are expecting twins or triplets, or if you have complications like diabetes, placenta previa or if you smoke, then your baby is more likely not to be born on his or her (or their) due date.

What You Can Do

If you are asking ‘when am I due’ because of a specific reason (you want your child to be born on a specific day, or you need to plan for a trip or occasion) then you might not want to leave it up to nature.

The two main options here are to have your labor induced on a specific day, or to opt for an elective caesarian. Both of these options allow you to control the day that your child is born on, although most doctors will only do them if you are on, or near, your original due date.


  1. The average length of a pregnancy is 40 weeks, or 280 days.
  2. Eighty percent of children are born on, or within ten days of, their due date.
  3. Induction or elective caesarian are options if you need to be sure.
  4. Your due date is calculated from the first day of your last period.

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