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  3. Pregnancy due date calculator
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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.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

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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.

Dates

Calculate from
Defaults to today

Naegele's rule: last period plus 280 days, conception plus 266. A known due date passes through and the other two anchors are derived back from it.

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