Due Date Calculator
Estimated delivery date by Naegele's rule
Calculate your estimated due date (EDD) from the first day of your last menstrual period using Naegele's rule, the standard method accepted by ACOG.
For guidance only. The calculated date is an estimate. Only your doctor or midwife can confirm gestational age with an ultrasound.
Enter the date of the first day of your last period
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How it works
- 1Identify the first day of your last menstrual period (LMP).
- 2Naegele's rule adds 280 days (40 weeks) to the LMP.
- 3Get the estimated due date, current gestational age, and trimester.
- 4Share the result with your doctor or midwife for follow-up.
Frequently asked questions
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