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      Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
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    Chief Complaint


    Organ System


    Patent Pending

    Pregnancy Due Dates Calculator

    Calculates pregnancy dates, forward from last period or backward from due date.


    Enter last menstrual period (LMP), current gestational age (GA), OR expected due date to determine the other two, plus estimated date of conception.

    When to Use

    Patients who are pregnant or may be pregnant.

    Last Menstrual Period (LMP)
    Gestational Age (GA)
    Due Date (EDC)


    Please fill out required fields.

    Next Steps
    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?