## How do I calculate my future due date?

The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. 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). This is the method used by “pregnancy wheels”.

### Why is due date calculated from first day of last period?

If you were having regular periods before pregnancy, your doctor will calculate your due date based off of your last menstrual period. This goes back to the fact that in order to get pregnant, your body ovulated—or released an egg—roughly in the middle of your cycle and it was fertilized by sperm.

**Is 2 weeks always added to pregnancy?**

The development of pregnancy is counted from the first day of the woman’s last normal menstrual period (LMP), even though the development of the fetus does not begin until conception, which is about two weeks later.

**How to calculate a conception date based on the due date?**

The calculation of the estimated due date (EDD) is based on the day of the date of ovulation and fertilization. The EDD can be calculated by adding 266 days to the day of ovulation/fertilization.

## How do you calculate pregnancy due date?

The pregnancy due date is usually calculated, by adding seven days to the first day of the last menstrual period, and subtracting three months from the result.

### How is the due date for a pregnancy typically calculated?

A typical pregnancy lasts 280 days or 40 weeks. Pregnancy due date is calculated from the date of the first day of your last period (LMP) plus 280 days. A woman’s average menstrual cycle is 28 days from the beginning of one period to the beginning of the next period.

**How do you calculate babies due date?**

How to Determine Pregnancy Due Date. The average gestation period or pregnancy term is estimated to be 40 weeks or nine months. The pregnancy due date is usually calculated, by adding seven days to the first day of the last menstrual period, and subtracting three months from the result.