Pregnancy Due Date Calculator
Estimate your pregnancy due date and current week from the first day of your last menstrual period (LMP), using Naegele’s rule. An estimate — your clinician’s dating scan is the authoritative date.
Quick answer
The estimated due date is your last period’s first day plus 280 days (Naegele’s rule). It’s an estimate — a dating ultrasound from your clinician is the authoritative date.
Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.
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