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To find your due date, enter the date of the first day of your last period, and click 'show your due date' - the calculator will do the rest.
Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.
The World Health Organization defines a normal pregnancy term to last between 37 and 47 weeks.Weight management merits consideration because insufficient or excessive weight gain can have negative effects for both mother and fetus including the need for cesarean section (C-section) and gestational hypertension.While the values vary between women, the Institute of Medicine recommends an overall pregnancy weight gain of 25-35 pounds for women who are considered "normal" weight (BMI 18.5-24.9), 28-40 pounds for those considered underweight (BMI Our Pregnancy Weight Gain Calculator is based on the Institute of Medicine recommendations.Studies have shown that fewer than 4% of births occur on the exact due date, 60% occur within a week of the due date, and almost 90% occur within two weeks of the due date.
As such, while it is possible to be fairly confident that a person's child will be born within about two weeks of the due date, it is currently not possible to predict the exact day of birth with certainty.
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.