Pregnancy Calculator

The Pregnancy Calculator can estimate a pregnancy schedule based on the provided due date, last period date, ultrasound date, conception date, or IVF transfer date.

Week	Date Range	Trimester	Important Milestones

Note: The results of this calculator are estimations based on averages for single pregnancy. The results for twin pregnancy or multiple pregnancy are different.

Pregnancy Term & Due Date

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. Childbirth usually occurs approximately 38 weeks after conception, or about 40 weeks after the last menstrual period. The World Health Organization defines a normal pregnancy term to last between 37 and 42 weeks.

During a person's first OB-GYN visit, the doctor will usually provide an estimated date (based on a sonogram) at which the child will be born, or due date. Alternatively, the due date can also be estimated based on a person's last menstrual period.

While the due date can be estimated, the actual length of pregnancy depends on various factors, including age, length of previous pregnancies, and weight of the mother at birth.¹

Pregnancy Detection

Pregnancy can be detected either by using pregnancy tests or by the woman herself noticing a number of symptoms, including a missed menstrual period, increased basal body temperature, fatigue, nausea, and increased frequency of urination.

Pregnancy Management

There are a number of factors that need to be considered during pregnancy, many of which are highly dependent on the individual's situation, such as medication, weight gain, exercise, and nutrition.

Medication:

Taking certain medications during pregnancy can have lasting effects on the fetus...

Weight gain:

Weight gain is a largely inevitable and necessary aspect of pregnancy...

Exercise:

Studies indicate that aerobic exercise during pregnancy helps to improve or maintain physical fitness...

Nutrition:

Nutrition during pregnancy is particularly important for the health of the mother and baby...

1. Jukic, AM, Baird, DD, Weinberg, CR, et al. 2013. "Length of human pregnancy..."
2. Moore, Keith. 2015. "How accurate are 'due dates'?" BBC...
3. Institute of Medicine. 2009. "Weight Gain During Pregnancy..."