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Pregnancy Due Date Calculator

Estimate your due date and current pregnancy week using Naegele's rule.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator estimates an expected delivery date by starting from the first day of your last menstrual period (LMP) and adding 280 days (40 weeks) — Naegele's rule, the standard convention in obstetric dating. Because actual delivery timing varies naturally from one pregnancy to the next, the result is a statistical estimate centered around the most likely date rather than a fixed prediction.

Expecting parents use it early on to get a general sense of timeline for planning purposes, from figuring out which trimester they're in to booking time off work or preparing a nursery. It is often used alongside ultrasound dating, which can refine the estimate as the pregnancy progresses.

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