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

Pregnancy Calculator

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

🔒 Inputs stay in this browser by default✓ Sources & limitations shown
Calculator
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days
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Enter or adjust the values above, then calculate.

    See pregnancy week, trimester, due date and countdown together

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

    Inputs this tool uses

    • Start from
    • Date
    • Usual cycle length

    What you get

    Estimated gestational age; due date 2027-07-02.

    Gestational age0 weeks 0 days
    TrimesterFirst
    Estimated due date2027-07-02

    How to use the Pregnancy Calculator

    1. Enter start from, 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 0w 0d. 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 Pregnancy Calculator

    Can an ultrasound change the due date shown here?

    Yes. This page gives a conventional date estimate from the inputs you provide. Clinical ultrasound and clinician assessment can establish or revise pregnancy dating.

    Connected tools

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

    ◔Due Date Calculator

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

    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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