# Estimated due date

Index

## How to calculate the probable date of birth

#### Pregnancy: Many ways to calculate this important day

How can a doctor know the likely date of delivery so easily and accurately? Most people have asked this at one time or another. Most doctors do this with the help of a formula or technology. The truth of this matter is that there are many ways to calculate the probable date of delivery . The methods they use can be computer applications , which includes nine months from the day of their last period, to a series of traditional media. The only common factor is that they are all quite accurate.

### How are the nine months calculated?

Nowadays, the formula most used to calculate the probable date of childbirth is to add the nine months from the beginning of the last period, and then subtract two weeks. In a simpler way, to calculate the probable date of delivery can be calculated by adding 40 weeks from the first day of the last menstrual period, then subtract 14 days from this date. This formula is known as the UPM (last menstrual period).

Another very simple method that has been used to calculate the possible date of delivery is the Naegle formula . As in many formulas you need to know the first day of the last menstrual period . To determine the date of birth with this formula simply add 9 months and seven days, which is equivalent to 280 days. Keep in mind that the birth will not be given the exact day, it may be a few days before or a few days later.

Modern medicine often uses technology to calculate a probable date of delivery that usually hits in 98 percent of cases. This implies the use of ultrasound

In general, with all the methods currently used to calculate the probable date of delivery , you can know the exact date of birth of a baby. Although it is not always accurate, today it is quite accurate. Just remember that for centuries many have had similar accuracy in the probable date of birth .