Health Library Interactive Tool: What Is Your Due Date?From Healthwise

Click here to find your due date.

This interactive tool calculates your pregnancy due date, an estimate of when you are likely to deliver your baby.

To find your due date, the calculator takes the first day of your last menstrual period (LMP) and adds 40 weeks. If you are planning a pregnancy, you can use this calculator to plan the birth for a certain month or season.

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	Pregnancy due date

Your due date is an estimate of when you will likely have your baby, based on the normal length of a full-term pregnancy. Although only about 3% to 5% of women actually deliver on their expected due date, most women deliver within 14 days of their due date.¹

Your health professional will also measure the size of your uterus and use ultrasound testing to determine your due date. For more information on planning a healthy pregnancy, see the topic Pregnancy.

Source: Katz VL (2003). Prenatal care. In JR Scott et al., eds., Danforth's Obstetrics and Gynecology, 9th ed., p. 5. Philadelphia: Lippincott Williams and Wilkins.

Citations

1. Rouse DJ, St John E (2003). Normal labor, delivery, newborn care, and puerperium. In JR Scott et al., eds., Danforth's Obstetrics and Gynecology, 9th ed., pp. 35–56. Philadelphia: Lippincott Williams and Wilkins.

Other Works Consulted

• Bernstein HB, Weinstein M (2007). Normal pregnancy and prenatal care. In AH DeCherney et al., eds., Current Diagnosis and Treatment Obstetrics and Gynecology, 10th ed., pp. 187–202. New York: McGraw-Hill.

• Katz VL (2003). Prenatal care. In JR Scott et al., eds., Danforth's Obstetrics and Gynecology, 9th ed., pp. 1–20. Philadelphia: Lippincott Williams and Wilkins.

Author:	Monica Rhodes	Last Updated: November 7, 2007
Medical Review:	Adam Husney, MD - Family Medicine Kirtly Jones, MD - Obstetrics and Gynecology
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