BarnMD Obstetric Hub

Pregnancy Due Date Calculator

Calculate estimated due date, gestational age, trimester status, and clinical milestones using Naegele's Rule — with a downloadable clinical record.

Medically ReviewedNaegele's RulePDF ExportPrivate & Secure

Patient Intake

Last Menstrual Period (LMP) *Used to calculate EDD via Naegele's Rule

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Clinical Note

EDD is calculated using Naegele's Rule (LMP + 280 days). All results should be validated via Crown-Rump Length (CRL) measurement during the first trimester ultrasound.

Ready to Calculate

Enter the patient's LMP date and click Analyse Gestation to generate the clinical dashboard.

Educational use only. EDD calculated via Naegele's Rule (LMP + 280 days) and may vary by 2–3 weeks. Confirm via first-trimester ultrasound CRL measurement. This tool does not replace clinical assessment by a qualified healthcare professional.