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How to Use Conception Calculator To Find Your Conception Date?

  • 4.7 (5 Votes)

Pregnancy Conception Calculator uses the last menstrual period's first date and due date for pregnancy (supposed birth date) for determining the Conception Date for the Baby. Its usually a range of days in which the conception might have occurred.

There are several questions in woman’s mind when she expects and the most basic question we have is when to have the little bundle of joy in hands. For such queries, the expecting moms can use conception calendar, which is used for estimating the date of pregnancy conception. In conception calculators, you need to use the first day of the previous menstrual period for estimating the conception date. The model of the calculator is based on the menstrual period length as well as estimated ovulation time.

The conception calculator will provide you with possible days when the conception can occur.

How does Conception Calculator work?

The calculator will figure the gestational age of the baby for understanding the conception date. As all of us know it is hard to predict the actual date of conception, the calculator uses the last menstrual period's first date for determining the range of days in which conception can occur.

The pregnant women can also use the conception calculator if they want to know the baby's due date. This can be typically done after 5 to 6 weeks after the last periods for understanding the baby's gestational age as well as an approximate due date.

conception date

So if the expecting mother knows either of the figures then they can use this information in conception calculator along with the current date for finding the possible conception days. The calculator calculates it with the average 28-day cycle. Plus this process is based on the assumption that every pregnancy is typical and will last till 40 weeks and every woman has 28-day cycle.

For calculating the estimated conception date, the calculator will use last period date, date back three months and then adding up 7 days for knowing the due date. It will count back 38 weeks with the estimated delivery date for providing the approximate conception date.

This calculator is useful for mothers or expecting moms who are keen to find out when they are going to conceive. Other calculators like ovulation calculator, due date calculator and sexual intercourse timing calculator are actually meant for those women who want to track their fertility and pregnancy.

What is Last Menstrual Period or LMP?

The LMP or last menstrual period is a time of regular bleeding. The first day of the menstrual cycle is the first day of the LMP. You are required to enter this date when asked to enter the LMP.

Are these conception calculators practical?

The practicality of conception calculator usage varies from woman to woman. Although, it is hard to say that it shows the exact date of conception but it is capable of providing a solid prediction.

conception calculator work

Besides, woman who has different partners at a given time and want to know about her baby's father, they can also use the conception calculator. Though paternity test is much more reliable in such situation if the woman was not ovulating during those times.

Can conception calendar be wrong?

Yes, without any doubt there are chances of conception calendar being wrong. There is though no perfect way for estimating the conception date until and unless intercourse has happened only one during periods.

Why ultrasound provides different conception date than a conception calculator?

Ultrasound uses the fetus size for determining the gestational age and the date can change throughout the pregnancy term due to the fetus size. When we talk about conception calendar, it uses the first day of the last menstrual cycle as well as the average menstrual cycle for knowing the possible date of conception.

How online conception calculator, pregnancy due date calculator and wheel conception calculator, which an obstetrician uses, are different?

There is hardly any difference. The doctor will use the first day of your menstrual period for estimating the due date and conception date which is quite similar to online conception calculator work.

A pregnant woman can use online conception calculator to know the estimated delivery date or date of conception. All the results will be based on the details provided by the expecting mother so, it is important for a woman to know the exact first date of their last menstrual cycle for getting the reliable result.

While in case of pregnancy due date calculator, you will get the exact date on which the baby is due along with other important details such as implantation date, when the baby will show movements and dates important for tests like ultrasound, glucose screen and amniocentesis.

Wondering how to calculate your due date of pregnancy? If yes, check out the ways to know your approximate delivery date beforehand. Also, if your baby is in breech position, learn the ways to turn a breech baby naturally.

Dr. Chitwan Dubey

About The Author

Obstetrician, Gynecologist Dr. Chitwan Dubey

Dr. Chitwan Dubey is a leading Obstetrician and IUI Expert currently working at SevenHills Hospital in Andheri, East Mumbai. She has been practicing in the same field for over a decade and her areas of expertise are Endometriosis, Ectopic Pregnancies, Fibroids, Total Lap Hysterectomies, and Fertility Enhancing Diagnostic etc. She completed MBBS from Rant's Medical College in 2004 followed by MS in Obstetrics and Gynaecology from Mumbai University in 2006. Dr. Chitwan Dubey is an honoured member of Indian Medical Association (IMA). For contact details of Dr. Chitwan Dubey visit


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Manoj Kumar

My all doubts got answered in this article. Thanks for sharing this!

Sept. 29, 2018, 8:52 p.m. 5.0


Mohini Jaydev

I delivered my baby 6 days late. Is this going to harm my baby in the future?

Sept. 9, 2018, 7:51 p.m. 4.5


Radha Mishra

It's really hard to calculate conception date on your own. My gyne has given me 2 expecting days and I am sticking to it.

June 24, 2018, 3:50 p.m. 4.5


Anita Williams

Totally new to conception calendar thing. Guess I'll get it.

June 2, 2018, 2:44 p.m. 5.0


Pandhare Sudhakar Ramrao

May 8, 2018, 4:50 p.m. 4.5

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