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Home›Pregnancy›Due Date Calculator
Pregnancy · Evidence-aware tool

Due Date Calculator

Estimate due date from LMP, cycle length, conception or IVF-related timing and explain the ultrasound-dating caveat.

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Enter or adjust the values above, then calculate.

    Estimate a due date from LMP or conception dating

    Estimate due date from LMP, cycle length, conception or IVF-related timing and explain the ultrasound-dating caveat.

    Inputs this tool uses

    • Dating method
    • Date
    • Usual cycle length

    What you get

    Estimated due date from the selected dating method.

    Estimated due date2027-07-02
    Methodlmp

    How to use the Due Date Calculator

    1. Enter dating method, date, usual cycle length.
    2. Select any method, activity level or option shown on this page, then choose Calculate.
    3. Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.

    How this calculation works

    Pregnancy dating uses standard LMP, conception or IVF date conventions. Clinical ultrasound and clinician assessment can revise a working due date.

    Method transparency: Results are calculated from the values you enter. Health estimates are educational reference values, not diagnoses or treatment advice.

    Example calculation

    The sample values loaded into the calculator produce 2027-07-02. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.

    Assumptions and limitations

    • Pregnancy dating is an estimate and clinical ultrasound may change the working due date.
    • This tool is educational and does not replace prenatal care or medical advice.

    Sources and review status

    Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.

    Methods for Estimating the Due DateAmerican College of Obstetricians and Gynecologists · reaffirmed guidance · verified 2026-09-25Pregnancy dating and estimated due date conventions

    Questions people ask about Due Date Calculator

    Is the estimated due date the exact day a baby will be born?

    No. It is a dating convention, not a prediction of the exact birth date. Ultrasound and clinical information can also change the working due date.

    Connected tools

    Continue with the closest related calculation without re-entering sensitive values automatically.

    ◔Pregnancy Calculator

    Calculate gestational age, trimester, estimated due date, progress and countdown from LMP or due date using date-only arithmetic.

    Open tool →    ◔Pregnancy Week Calculator

    Calculate current pregnancy week and day from LMP or due date and show the estimated due date.

    Open tool →    ◔Gestational Age Calculator

    Calculate gestational age in completed weeks and days from LMP or due date and show the calculation basis.

    Open tool →
    Medical boundary: AG Health Tools provides educational wellness estimates and private tracking utilities. It does not diagnose conditions, recommend treatment, calculate medication doses, or replace a clinician.
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