Estimated Due Date (Naegele's Rule)

Estimates the due date from the first day of the last menstrual period, assuming a regular 28-day cycle.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

First Day of Last Menstrual Period

Enter the values above to see the result.

Source

Naegele FC. Lehrbuch der Geburtshilfe. 1830.
ACOG Committee Opinion No. 700: Methods for Estimating the Due Date. 2017.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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