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    Pregnancy Due Dates Calculator

    Calculates pregnancy dates from last period, gestational age, or date of conception.

    INSTRUCTIONS

    • Enter date of last menstrual period, gestational age (on today's date or other ultrasound date), date of conception, OR estimated due date to estimate the other dates.
    • Only EDD is affected by cycle length ≠28 days when calculating from LMP, EGA, and EDC.
    • When starting with EDD, all results change depending on cycle length.
    When to Use
    Pearls/Pitfalls
    Why Use

    Patients who are pregnant or may be pregnant.

    According to ACOG, ultrasound measurement in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age.

    Accurate estimates of gestational age may positively affect pregnancy outcomes, including lower risk of post-term induction and earlier detection of multiple gestations (Whitworth 2015).

    days
    Last menstrual period
    Estimated gestational age (EGA) as of today
    EGA as of another date
    Estimated date of conception
    Estimated due date

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights
    Dr. Frank A. Chervenak

    About the Creator

    Leading expert on the Pregnancy Due Dates calculator:

    Frank A. Chervenak, MD, is a professor, chief OB-GYN and chairman of the Department of Obstetrics and Gynecology at the New York Presbyterian Hospital. He is the author of “How Accurate Is Fetal Biometry in the Assessment of Fetal Age”, a comparative study of the gestational age prediction equation for singletons, twins and triplets with other pregnancy prediction formulas. Dr. Chervenak has published 250+ papers and co-authored/edited textbooks on topics including ultrasound and ethics in obstetrics and gynecology and physician leadership.

    To view Dr. Frank A. Chervenak's publications, visit PubMed

    Are you Dr. Frank A. Chervenak? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    About the Creator
    Dr. Frank A. Chervenak
    Are you Dr. Frank A. Chervenak?