Moms-to-be are both excited and anxious about their baby’s arrival, and to find out the nitty-gritty details of their pregnancy phase such as estimated due date or the time when they actually made history—conceived!
Knowing these key details about your pregnancy can greatly help plan the nine or so months ahead, and can be done in several ways including tickling your brain and performing these calculations manually, or simply using a trusted online due-date calculator.
Regardless of what route you take to figure out these details whether manually, with an automatic pregnancy calculator or at your doctor’s office via a blood or urine tests, it is important to accept the fact that the results are just estimates, and could be off by 15 days or more.
Decoding the Online Pregnancy Calculator Theory
Using these pregnancy calculators is a no-brainer, where you simply input a few numbers and voila—you know when your little munchkin is due to set foot in the real world. However, what’s important here is educating yourself on the underlying algorithms of these pregnancy calculators, so that you can get a fairly close estimate, and not go out and buy infant winter clothing when your baby is due to arrive just in time for the summer.
A pregnancy due date calculator often referred to as a pregnancy week calculator determines your estimated due date with a simple formula—adding 280 days (40 weeks of pregnancy) to the first day of your LMP (last menstrual period) assuming a 28-day cycle. LMP is the first day of your last menstrual period, so if you experience regular menstrual periods and ovulation occurs on day 14 of your cycle, conception is generally two weeks after your LMP.
What exactly is an Ovulation Calculator?
An ovulation calculator helps you determine the time you ovulate so that you can predict when you’re most likely to be fertile. This calculator just like a due date calculator delivers near accurate results for women who have regular periods, which means having a menstrual cycle every 21 to 40 days.
Predicting your fertile window with the help of an ovulation calculator can help you determine the best time to conceive, which is typical during the first five days preceding ovulation and to the date ovulation occurs. Ovulation itself in most cases occurs between day 10 and day 19 of your period or 12 to 16 days before the next menstrual cycle is due.
Other important pregnancy measuring tools include:
- Conception Calculator – This handy pregnancy tool helps you determine when you actually conceived. Most women are eager to know when they conceived for several reasons, most notably to solve paternity issues or simply curiosity. Conception calculators, however, aren’t accurate most of the time, unless you have unprotected sex just once during your fertile period.
- Fetal Age Calculator – If you’re eager to know your baby’s age, a fetal age calculator can help you figure out the estimated day your baby begins to develop. It is however easy to get confused between fetal and gestational age, but the big difference between the two is that the former represents the actual age of your growing fetus, whereas the latter is the age of your pregnancy starting from your LMP.
Pregnancy Calculators Make Things Simple
Calculating your due date and other aspects of your pregnancy manually can be a daunting task. Although online pregnancy calculators do help ring up these numbers automatically using preset formulas, the results are just an estimate and not exact. In fact, only 5 percent of births take place exactly on the estimated due date provided by an online due date calculator.
Apart from using an online due date calculator, there are several other offline formulas you can use to calculate your baby’s birthday such as
- Naegele’s rule – This involves adding seven days to the first day of your LMP and then subtracting three months.
- Pregnancy Wheel – This is a method commonly used by medical professionals, where they locate your LMP date on the wheel, and then lineup that date with the indicator to display the due date.
Again, both of the aforementioned methods do involve a bit of brainstorming, something that you don’t have to deal with when using an online pregnancy calculator.