Due Date Calculator


Know all about pregnancy due date calculator.


You are here most probably because you’ve taken a pregnancy test and it hit a positive. Congratulations! That’s definitely something exciting to look forward to and well, your next immediate curiosity now is to know when your baby bundle will reach your hands.

In medical terms, the date when your baby is expected to be born is referred to as Estimated Due Date (EDD). Henceforth, you would get to see ‘EDD’ quite often, in your scan reports, doctor’s notes, etc. While your regular ultrasound scan can predict your pregnancy due date, here is some information that can help you understand your baby due date at a greater depth.

If you do not want to take up any arithmetic load on your head, you can use a simple online due date calculator which works based on your LMP. With most due date predictors, you would need your LMP or the date you conceived to derive at your due date.

What is LMP?

In addition to EDD, LMP is another term you will be constantly asked, almost during each of your visits to the doctor. LMP stands for your Last Menstrual Period, that is, the first day of your most recent menstruation. LMP is an important necessary factor for the due date estimator.

How to calculate due date manually?

According to one of the pregnancy due date calculator theories, the gestational age of the baby is 40 weeks; thus a straightforward way to estimate the due date is to add 40 weeks’ time to the LMP. But, if you suppose a pregnancy calculator can be this simple, you’ll be miserably wrong because only less than 5% of pregnancies have proved this method to work right.

Does that mean you need to know something more? Certainly yes!

Approximately 10 to 14 days after your LMP, your conception window begins; that is, the potential fertile dates which can favor conception, though fertilization cannot happen until ovulation. If you are sure about your cycle length, you can check with a conception calculator, to know the exact ovulation date. You are most likely to have conceived within a day after ovulation because an ovum can remain viable only for a few to 24 hours while a sperm can survive in the female reproductive tract for around 5 days.

Said that, even if you have had intercourse on, say 15th January, and your ovulation was to be on 18th January, conception would not have occurred before the 18th. Hence, the date you conceived depends on your ovulation day more than the day you had sex.

Now that you know your conception date, you may wonder ‘when is my due date’?

You can predict your due date by adding 38 weeks to your conception date. This method works fairly better than calculating from your LMP because it rules out your cycle length factor; specifically helpful if your cycle length is a few days plus or minus the average 28 days.

How is pregnancy week calculated?

If your brain has been actively doing some math, from playing roles of a conception date calculator to baby due date calculator, the next in the row is pregnancy week calculator. You might be curious to know how pregnant am I; to know since how many weeks your baby has been in you.

Surprisingly, at the time you miss your period, you are already 4 weeks pregnant. While it could be a little confusing to understand in the beginning, you will soon get the hang of tracking your pregnancy week by week.

Officially, your pregnancy begins on the first day of your last period. By the time you are conceived, baby is considered to be two weeks already. In the next two weeks, when it is time to expect your next period which does not happen, you are 4 weeks pregnant.

What next?

Most often, an early pregnancy scan will be scheduled with your doctor, in 2 – 4 weeks after your missed period. This is your first scan and will accurately predict your due date, the baby’s age and the position of the fetus, based on the development of your baby.

Now that the due date calculator has done its job, get ready for the exciting days are ahead, as you learn what happens to your baby bundle inside, week after week


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