Pregnancy Due Date Calculator

Pregnancy Due Date Calculator


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About Due Date Calculator

Pregnancy due date or simply due date is the expected delivery date for a pregnant woman. Our due date calculator calculate the estimate due date of your delivery. Our pregnancy due date calculator works based on LMP (Last Menstrual Period), your average cycle length and your luteal phase length.

The Menstrual period is the regular change that occurs in the female reproduction system (mainly in uterus & ovaries)which makes pregnancy possible. The Menstrual cycle occurs due to hormonal imbalance (rise & fall of certain hormone level) . During the period uterus wall become thicker and egg (required for pregnancy) releases from an ovary around day fourteen in the cycle.  If pregnancy does not occur, the uterus wall collapsed and released through urinary tract & is known known as Menstruation (or period or monthly)The typical length of one complete cycle is 21 to 45 days in young women and 21to 35 in adults.  The average length of one period is considered as 28 days .

During 12-14 day of Menstrual period ovulation occurs.  Ovulation is the release of ovum (or egg) from an ovary to the oviduct.

From the ovulation till the beginning of your next period , this phase is called luteal phase.  For normal cases this phase lasts for 14 days.

How Due Date Calculator Estimate

Like most of healthcare providers,  we can calculate your due date counting 40 weeks from the first day of your  last period. If your period is 28 days long. But if you know your conception date,  just add 266 days to get your estimated due date.

The thing you have to consider is that out due date calculator calculate the estimate due date of a pregnant woman.  It is not totally accurate. For more accurate due date please consult a doctor or your personal physician . For normal pregnancy due date is approximately between 38-40 weeks.


  • *only about 5% babies are born on their actual estimate due date.  
  • *Approximately  80% babies are born within 10 days of the predicted day.  
  • *Around 20% babies are born after the expected due date.  
  • *Ultrasound can predict your delivery date more accurately in early stage of pregnancy than due date calculator or else.  It is also helpful if you did not keep track of your periods or do not remember the date of your last Menstrual period.

Why Use Pregnancy Due Date Calculator?

Your due date is very important. Not only so you know when to have the nursery ready, but so you will know how far along you are from a hospital or healthcare centers. Due date calculator helps you track the progress of your pregnancy. This ensures your baby is growing and developing on schedule. To estimate your due date, you can use our pregnancy due date calculator.

If your period are regular , then simply add 40 weeks from the first day of your last period or you can use our pregnancy due date calculator.

In contrast,  if your periods are not regular.  Then regular pregnancy calculator might not be helpful for accurate due date.  You should visit to your doctor or physician. Ultrasound test can determine your gestational age most accurately.

Pregnancy Milestones

Pregnancy Milestones