Pregnancy Due Date Calculator

Medically, the Due Date or the expected date of delivery (EDD) is calculated by taking the first day of your last normal menstrual period (LMP) as the starting point. The pregnancy lasts for 280 days, i.e. 10 pregnancy months (each month = 28 days, i.e. 40 weeks).
 
The Due Date is just an expected one and about 50% expectant mothers do not deliver on that day. It is normal to deliver in three weeks before or 2 weeks after that. In fact, there are many ways to calculate the expected date of delivery (EDD), and you can reckon on your own.

Calculate with LMP

Adding 9 months or subtracting 3 months, and adding 7 days to the first day of the last menstrual period, you will get your EDD.

For example:

The last menstrual period first date was Feb. 1st, 2019.
Day: 1 + 7 = 8
Month：2+9=11
EDD Date: Nov. 8, 2019

Calculate with Quickening Date

If you do not remember your LMP, you can also calculate with quickening date. Generally, the first fetal movement occurs between week 18 and week 20 of pregnancy. The calculation method is: adding 20 weeks to the quickening date if you are a primipara; adding 22 weeks to it if you are a multipara.

Calculate with BBT Curve

Taking the last day of the BBT curve low-temperature section as the ovulation date, and adding 264-268 days or 38 weeks to it, you will get your Due Date.

Estimate by B-ultrasonic Examination

Your physician can estimate the gestational age and your expected date of delivery thru the biparietal diameter (BPD), crown-rump length (CRL) and femur length (FL) measured in B-ultrasonic examination.

Estimate thru Morning Sickness

Morning sickness usually occurs at the end of the 6th week, i.e. the 42th day since the LMP. Counting from this day to 280 days, you will get the Due Date.