Pregnancy Due Date Calculator

Estimate your due date and pregnancy timeline from the first day of your last period.

Your Pregnancy Timeline

Key milestones

    This calculator gives an estimate based on a standard 28-day cycle. Individual cycles vary. It is not a medical diagnosis — consult your doctor.

    How is the due date calculated?

    We use Naegele's rule: add 280 days (40 weeks) to the first day of your last period. If your cycle is longer or shorter than 28 days, we adjust accordingly.

    Only about 5% of babies arrive on their exact due date; most arrive within two weeks of it. Your doctor may revise the date based on an early ultrasound.

    Considering fertility treatment abroad? FertiJourney offers affordable IVF at a Shenzhen public hospital — get a free cost quote.

    Considering IVF?

    Get a personalized IVF cost and success estimate from FertiJourney.

    Get My Free IVF Quote

    Due date calculator FAQ

    How is my due date calculated?

    Using Naegele's rule: we add 280 days (40 weeks) to the first day of your last period. If your cycle is longer or shorter than 28 days, we adjust the estimate accordingly.

    How accurate is the due date?

    Only about 5% of babies arrive on their exact due date; most are born within two weeks of it. Your doctor may revise the date based on an early ultrasound.

    I had IVF — which calculator should I use?

    For IVF pregnancies, use our IVF due date calculator, which is based on the embryo transfer date and is more precise for IVF.

    ✈️💬