Pregnancy due date and gestational age
Gestational age and estimated date of delivery from LMP, ultrasound, or IVF transfer date.
About this calculator
Three methods: Naegele from LMP with cycle adjustment, ultrasound-derived dating, and IVF transfer date. First-trimester ultrasound gives the most accurate dating; ACOG Committee Opinion 700 (2017, reaffirmed 2024) recommends ultrasound when LMP and scan disagree by more than 7 days.
Source
Formula version: naegele-acog-2024-v1
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