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Most normal pregnancies last around 40 weeks or about 38 weeks from conception. The best way to estimate your pregnancy due date is to count 40 weeks from the start of your last period. Our Due Date Calculator will help you

find out the Estimated Due Date (EDD) of your pregnancy.

Are you counting weeks, months and trimesters? Use our Due Date Calculator to find out your due date or your baby’s

expected birthday!

Due Date Calculator

Naegele’s ruleThe rule estimates the expected date of delivery (EDD) (also called EDC, for

estimated date of confinement) from the first day of the woman's last menstrual period (LMP) by adding one year, subtracting three months, and

adding seven days to that date. The result is approximately 280 days (40 weeks) from the start of the last menstrual period.

Example:

• LMP = 8 May 2009• +1 year = 8 May 2010−3 months = 8 February 2010+7 days = 15 February 2010

Other Methods to Calculate Due Date

Ultrasound: An early ultrasound can more accurately date the pregnancy.

Size of Uterus: Your practitioner will note the size of your uterus when your initial internal pregnancy examination is performed.

Fundal Height: The top of your uterus is measured by your gynaecologist / obstetrician at each prenatal visit;

How does our Due Date Calculator Work?

Naegele’s rule is a standard way of calculating the due date for a pregnancy. This rule estimates the expected date of delivery (EDD) by adding one year, subtracting three months, and adding seven days to the first day of a woman’s last menstrual period (LMP). 

Due Dates for Normal PregnancyMost normal pregnancies last around 40 weeks or about 38 weeks from conception. The best way to estimate your pregnancy due date is to count 40 weeks from the start of your last period. This is how your care provider will estimate your due date. Do remember that it’s just as normal to deliver a baby a week or two before or after.

Is the Pregnancy Due Date Calculator always spot on?The due date calculator is not always accurate. Most studies emphasize that only one in 20 babies is actually born on his or her due date. Since a normal pregnancy often lasts anywhere between 38 to 42 weeks, most infants are born within two weeks either way of your EDD — this keeps most parents guessing their baby’s expected birthday!

Due Date Calculator

Put in the first day of your last period. Using Naegele’s rule we can calculate your due date.

Use our Due Date Calculator 

Due Date Calculator

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