Women & Girls Health
Pregnancy Due Date Calculator
Estimate when your baby is due from your last period.
This uses Naegele's rule, the standard method midwives use: count 40 weeks (280 days) from the first day of your last period. It's an estimate; only about 1 in 20 babies arrives exactly on the due date, and most come within a couple of weeks either side.
Educational only, not a medical diagnosis. Confirm dating with an ultrasound and your antenatal clinic.
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