Pregnancy due date calculator

Pick LMP date then calculate

    Ovulation Percentage Compound
    GuideUnderstanding Due-Date and Ovulation Estimates

    Learn how calendar-based pregnancy and ovulation estimates are calculated and why individual timing varies.

    Read guide →
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    Frequently asked questions

    How is due date calculated
    LMP plus 280 days for a 28 day cycle. Cycle adjustments shift the date accordingly.
    Is this medical advice
    No, estimate only.
    What if I have irregular cycles
    Results may be less precise, consider clinical guidance.
    What trimester am I in
    Trimester boundaries use standard week ranges.
    Do you store my dates
    No.
    Can I share the result
    Yes, use the screenshot button.
    What if I do not remember LMP
    Consult a professional, ultrasound can estimate dates.
    Can I change units
    Dates do not need units.
    Why different due dates on other sites
    Different assumptions and clinical overrides.
    Is the tool free
    Yes.
    What does the Pregnancy Due Date Calculator do?
    Estimate a pregnancy due date and milestone dates from a last menstrual period or conception date.
    How should I interpret a Pregnancy Due Date Calculator result?
    Read the displayed labels and validation messages together, then verify important findings against the original source. The result is a practical aid, not proof beyond the data it can inspect.
    What can affect the Pregnancy Due Date Calculator result?
    Inputs, source data, network conditions, and the limits explained on the page can affect the result.
    Where can I learn more about using the Pregnancy Due Date Calculator?
    Read “Understanding Due-Date and Ovulation Estimates” for a practical workflow, limitations, and checks to make after using the tool.