Pregnancy Due Date Calculator

Estimate your due date from your last period, conception date, or IVF transfer — with your current week and trimester.

✓ Reviewed by Dr. Poonam Sekhon Chahal · 24 May 2026

How this is calculated

From your last menstrual period (LMP), the estimated due date is LMP + 280 days, adjusted for your cycle length (Naegele's rule). Conception- and IVF-based methods use fixed offsets.

Sources

  1. American College of Obstetricians and Gynecologists Methods for Estimating the Due Date (Committee Opinion No. 700). Obstet Gynecol 2017.

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This calculator is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. The result is based on standard clinical formulas applied to the values you entered — your individual situation may need adjustments your doctor can make. Never disregard professional medical advice or delay seeking it because of something you read or calculated on healthcalculus.

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