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Women’s Health Library

Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Interactive Tool: What Is Your Due Date?

What does this tool help you learn?

This 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.

Katz VL (2008). Prenatal care. In RS Gibbs et al., eds., "Danforth's Obstetrics and Gynecology," 10th ed., p. 4. Philadelphia: Lippincott Williams and Wilkins.

What does your due date tell you?

Your due date is an estimate of when you will likely have your baby, based on the normal length of a full-term pregnancy. Most babies are born within 14 days of their due date.

What's next?

Your health professional will also measure the size of your uterus and use ultrasound testing to determine your due date.

Explore more

Credits

Current as of: February 23, 2022

Author: Healthwise Staff
Medical Review:
Sarah Marshall MD - Family Medicine
Adam Husney MD - Family Medicine
Kathleen Romito MD - Family Medicine
Kirtly Jones MD - Obstetrics and Gynecology

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