How a Pregnancy Calculator Works



Conceiving a child has two aspects to it. Sometimes it happens when you're not even expecting it and sometimes you have them after trying for ages. Pregnancy is one of the most beautiful yet stressful moments in a mother's life. It is said that after childbirth, a mother loses around 6 months worth of sleep for the next two years. Mothers are amazing creatures. It baffles the best of us at times as to how mothers fall in love with their children as soon as they see them and  protect them for  the rest of their lives. This love is unconditional, beautiful and precious and the bond between a mother and child cannot break easily.

Once a mother conceives it's natural that she will want to know till when she can expect the child to be on its way. The easiest way to do it is with the help of a due date calculator. Once your pregnancy tests for positive, you can use the calculator by entering important information to understand when your baby is due. The estimated due date is calculated based on your last menses.

How does a due date calculator give you your due date?

A due date calculator also functions as a pregnancy due date calculator. Most of the times we don't know when exactly did we conceive or when did an ovulation take place, hence a due date calculator takes the last menstrual period as the starting point and makes an estimation that the baby will be due after a period of 40 weeks. The cycle of a woman who has regular periods is considered to be of 28 days and the ovulation takes place on the 14th day. After this the calculator adds a sum today of 280 to the last menstrual period, which is approximately 40 weeks. This method of calculating the due date is known as Naegele’s rule.

This method of calculating the due date is named after Naegele, who was a German obstetrician.  His rule is one of the most common ones and this is what most pregnancy calculators are based on. Calculators which follow his rule, see childbirth in women who's menstrual cycle lasts for a period of 28 days but this is extremely unrealistic. Many women suffer from Polycystic Ovary Syndrome also known as PCOS and this causes an imbalance in the menstrual cycle regulation. Sometimes the irregularity is a difference of few days and sometimes it is for months. Hence this due date  calculator is not completely accurate.

It has also been tested and found that Naegele’s rule has consistently been wrong because the due date after calculation has been 2-5 days early. Hence a calculator which follows this rule isn't completely reliable but isn't wrong as well. If you want a more reliable calculator, use the Mittendorf Williams rule as a due due date calculator. Not only that, some online calculators facilitate pregnancy week by week pictures, which can help you determine how exactly your baby is growing.

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