How To Use Pregnancy Calculator For First-Time Mothers

Pregnancy due date calculators are unfamiliar for many people. Some only use a pregnancy calendar. However, this pregnancy tool is essential, especially for first-time mothers. With that, let us explore the ins and outs of a due date calculator week by week.


What Is A Pregnancy Due Date Calculator?

A pregnancy calculator provides estimates of three important dates for a mother and a baby. The list below enumerates the dates which the pregnancy calculator should have:

  • Date Of Conception: This date is most likely two weeks after your last period, and this is probably the day you conceive your baby.
  • Due Date: Refers to the date wherein your baby will approximately arrive in the real world
  • Estimated Fetal Age: Shows you the number of weeks of the development of your baby


Factors Considered When Using A Due Date Calculator

There are a lot of details needed in using a due date calculator. Here are some of the most critical factors.


1.  Average Length Of Menstrual Cycle

This factor refers to the average days on how long your period lasts. Most people usually input 28 days in this part. However, do not depend on this number since women have their cycle. Your cycle might be a little bit shorter or even longer. If you have an irregular cycle, just put in the default 28 days.

2. Last Menstrual Period

When putting your last menstrual period, you have to make sure you put the very first day of your last period. If you do not remember your last period, try getting a calendar and recall your days or weeks. This might help you determine the said date easier.

3. Average Luteal Phase Length

The Luteal Phase is a little bit complicated to determine than the previous two factors. To compute this, you have to find the difference between the beginning of your next period and the day after ovulation. If you also don’t know the dates needed to determine this, just use the default 14 days for your luteal phase.


How To Compute Your Due Date?

From the factors mentioned above, you can then use the following details to compute for your due date using the Naegele’s rule. This simple method can be implemented using the following processes:

  • The average due date is assumed to be 40 weeks after the first day of an individual’s last menstrual period.
  • The expected ovulation will happen on the 14th day on a 28-day long cycle.
  • With this, the preg calculator will just add seven days on the first day of the last menstrual period.
  • Using the value you got from the previous step, the user should subtract three months.
  • If necessary, change the year by adding one in the said year.


Week-By-Week Pregnancy Calculator


Aside from knowing the conception date and due date, it is also important to track the estimated fetal age through the pregnancy week calculator. Through the use of pregnancy calculator week by week, mothers will be able to follow their baby’s development and provide explanations and remedies for the changes happening in their bodies.


How Accurate Is A Pregnancy Calculator?

Remember, a pregnancy calculator by the due date is the best “estimate” for your baby’s arrival in our real world. However, only 4 percent of these babies are born on the exact computed date. Nevertheless, it is still best to prepare beforehand just in case you deliver your little bundle of joy outside the said due date.


No matter how small the possibility of your baby to be born on the forecasted day, it is still important to engage in this practice. Being a mother is not an easy task. Hence, it is better to familiarize yourself with a pregnancy calculator to at least foresee your baby’s condition and adequately prepare yourself with this milestone.

DISCLAIMER (IMPORTANT): This information (including all text, images, audio, or other formats on is not intended to be a substitute for informed professional advice, diagnosis, endorsement or treatment. You should not take any action or avoid taking action without consulting a qualified professional. Always seek the advice of your physician or other qualified health provider with any questions about medical conditions. Do not disregard professional medical advice or delay seeking advice or treatment because of something you have read here a

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