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Pregnancy Due Date Calculator

Estimate your due date from your last period, conception date or IVF transfer, with weekly milestones.

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How to use the Pregnancy Due Date Calculator

  1. 1

    Choose last period, conception date or IVF transfer.

  2. 2

    Enter the date (and your cycle length or embryo age if asked).

  3. 3

    See the due date, how far along you are, the trimester and key milestones.

Frequently asked questions

How is the due date calculated?

From the last period it is 280 days after its first day, adjusted for cycle length; from conception it is 266 days later; from an IVF transfer it is 266 days minus the embryo's age.

Is this medical advice?

No. It is an estimate only; an ultrasound dating scan is more accurate. Always follow your doctor's or midwife's advice.