There are several ways, or rules, to calculate the due date of a pregnancy by the last menstrual period in addition to the standard one used in the Flo calculator. More About Due Date Calculations Method 1: Due date by last menstrual period With this calculation, 266 days of pregnancy are added to the date you conceived.

Due date by conception date (or ovulation).

As this method is affected by the regularity of your menstrual cycle, itвЂ™s not 100-percent accurate. When using this method, the due date is calculated by adding 280 days (or 9 months, the common length of a pregnancy) to the first day of your last menstrual period.В Note that this assumption is for a regular 28-day cycle (cycles can vary from 20 to 45 days), and the menstrual period and ovulation are considered to be the first two weeks of pregnancy.

Due date by the last menstrual period.

You can choose between two methods when calculating your due date with the help of this calculator: How does the Flo Due Date Calculator work? You can read more about gestational age here and learn why itвЂ™s used to track pregnancy. While gestational age measures how far along a pregnancy is in weeks, fetal age is the actual age of the growing baby. The other method of measurement is fetal age. If a baby is born before 37 weeks, they are considered a premature baby. In general, pregnancies last anywhere from 38 to 42 weeks (or around 280 days). Gestational age is measured from the last menstrual period (LMP) - the first day of your last period - to the current date in weeks. Gestation is the time between the conception date and birth, or how long a person is pregnant in weeks. To track pregnancy and calculate a due date, gestational age is used. There are two ways to measure the age of a baby during pregnancy. In fact, only 1 in 20 people delivers on their estimated due date, which means only 5 percent of babies worldwide are born on their exact calculated date. The due date, or estimated date of delivery (EDD), is the approximate date when labor is expected to begin.ДЄs this date is just an estimate, youвЂ™ll probably start labor sometime in the two weeks before and after your due date.

If you have conceived through IVF, you can use our IVF and FET Due Date Calculator.Дue date calculation: How many weeks pregnant am I?.

If you have already had your first ultrasound scan, you can use our Due Date by Ultrasound Calculator.

We have created a slew of pregnancy calculators and tools to help you through your pregnancy. Pregnancy CalendarДЇollow your baby's development week by week in our article series. If you want to, you can view a sample due date report.

Timeline of Significant Milestones in Embryo/Fetal Development.

Due Dates for Multiples (Twins, Triplets, Quads).

Each due date report contains the following data: A normal pregnancy can last anywhere between 38 and 42 weeks. Most are born within a week either side of the estimated due date. On average only 5% of births take place exactly on the estimated due date. Be sure to talk to your health care provider about your due date. Every pregnancy is unique and your baby will come when it's ready. Please remember that your due date is only an estimate. If you deliver on your due date, your baby is actually only 38 weeks old, not 40.

Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy.

Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Pregnancy induced hypertension How is my due date calculated?

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