Pregnancy Due Date Calculator

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

Awaiting clinical review. Results are based on validated formulas but pending physician verification.

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.
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.