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# Pregnancy due date calculator

Estimate a due date from your last period, conception date, or a known due date, with a week by week milestone timeline.

Pick a method and enter a date to estimate the due date.

Naegele's rule assumes a regular 28-day cycle, and only about 5 percent of babies arrive exactly on the estimated date; clinical ultrasound dating beats calendar estimates whenever they disagree. The week timeline below is calendar convention, not clinical prediction. This page is general information only, not medical advice, and does not replace a qualified healthcare provider.
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## More time & date tools

- [Date calculator](/time/date-math)
- [Calendar converter](/time/calendar-converter)
[All time & date tools](/time)

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