Due Date Calculator Using Conception

This method is based on the idea that women typically ovulate about 2 weeks after their period starts and pregnancy typically lasts about 38 weeks.

Due date calculator using conception. Ultrasound uses the size of the fetus to estimate gestational age. The date of conception is the day on which a person s baby is conceived. The accuracy of the edd derived by this method depends on accurate recall by the mother assumes regular 28 day cycles. Ultrasound dating can change throughout pregnancy based on the size of the fetus.

This is the method used by pregnancy wheels. The due date may be estimated by adding 280 days 9 months and 7 days to the first day of the last menstrual period lmp. In order to calculate the estimated conception date the calculator will use the last menstrual period date and then add 12 16 days to it. Pregnancy term due date.

With the estimated delivery date it will count back 38 weeks to give an approximate date of conception. Our calculator estimates your due date based on lmp your average cycle length and your luteal phase length. Pregnancy is a term used to describe a woman s state over a time period 9 months during which one or more offspring develops inside of a woman. The pregnancy conception calculator estimates the date of conception based on the expected due date of the pregnancy last period date or ultrasound date.

Another way to do it is to subtract three months from the first day of your last period and add seven days. Childbirth usually occurs approximately 38 weeks after conception or about 40 weeks after the last menstrual period. Most pregnancies last around 40 weeks or 38 weeks from conception so typically the best way to estimate your due date is to count 40 weeks or 280 days from the first day of your last menstrual period lmp. Your due date is estimated to be 40 weeks after the first day of your lmp your cycle is assumed to be 28 days long with ovulation occurring at day 14 therefore the calculator adds 280 days 40 weeks to your lmp this method of due date calculation is known as naegele s rule more info on this below.

If the calculation is based on the 1st day of last period the result is equal to the 1st day of your last period plus 14 days plus your average menstrual cycle minus 28 days 30 days 28 days 2 14 16 days. And that s how most healthcare providers do it.