Pinned 116 times.Top Pages

Pregnancy Due Date Calculator

Pregnancy Due Date CalculatorCalculate your pregnancy due date with BabyMed's medically exact due date calculator. Find out when your baby is due. Calculation of an accurate pregnancy due date is among the most important steps in pregnancy. 

Calculation of the best estimated due date (EDD) is based on the day of the date of ovulation and fertilization. The EDD can then be calculated by adding 266 days to the day of ovulation/fertilization. 
If you don't know the exact date of ovulation, then use our Ovulation Calculator (or, your due date can be calculated by adding 40 weeks (280 days) to the approximate first day of your last menstrual period in a 28-day cycle). If your cycles are longer or shorter than 28 days, then the day of ovulation may change and this calculator takes that into condideration when calculating the EDD.

6 weeks pregnant

This week you should be able to see the fetal heart beat on ultrasound

10 weeks pregnant

In the 11th-12th week a nuchal screen is usually done for risks of Down syndrom

14 weeks pregnant

The following weeks some women may start to show their pregnancy

18 weeks pregnant

At 18-20 weeks an anatomic sonogram is done to look for fetal malformations

22 weeks pregnant

Many doctors do a transvaginal ultrasound around this time to measure the cervical length and assess risks for preterm delivery

26 weeks pregnant

Around this time a glucose screen is done to check for risks of diabetes

28 weeks pregnant

Fetal survival is excellent after 28 weeks

32 weeks pregnant

This is a good time to get ready for delivery in 6-8 weeks

36 weeks pregnant

Your due date is in 4 weeks

40 weeks pregnant

This is your due date, and most women will deliver within 7-14 days of their due date

Find out why estimating the correct pregnancy due date is important. Occasionally, it may be necessary to recalculate the estimated due date EDD based on other information such as on an ultrasound that was done and showed different information than a due date based only on your last period.


Try our Reverse Due Date Calculator to find out when you became pregnant. There, you can enter your due date and we will calculate the exact days of conception. More importantly, we will provide the range of dates that you may have made love and got pregnant.

Please also look at the Interactive Pregnancy Wheel.

How To Use the Pregnancy Due Date Calculator

The first step is to know the first day of your last menstrual period and the length of your menstrual cycle. Enter the date of the first day of the last menstrual period and the cycle length. Alternatively, you can also enter the day of ovulation, the weeks and days of the pregnancy on ultrasound, or the IVF egg or embryo transfer date.

The pregnancy due date calculator wil then calculate the exact date the baby will be due as well as other important events such as the date of implantation, when the baby will start moving and dates for important tests like amniocentesis, ultrasound, or glucose screen.

In addition to this calculator, there is also a unique and handy offline tool called the Ovulation Calendar & 9-Month Pregnancy Wheel that helps determine a woman's ovulation date and serves as a traditional pregnancy wheel after conception has occurred.

 References