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Pregnancy Due Date Calculator - Online LMP & Gestation Tool

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Pregnancy Due Date Calculator

Calculate your estimated due date and track your pregnancy progress using your last menstrual period (LMP) or conception date. Updated for 2025 — free, private, and instant.

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Frequently Asked Questions

The due date is typically calculated using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). If you know your conception date, 266 days are added instead. This calculator offers both methods and instantly shows your expected due date (EDD).

Only about 5% of babies are born exactly on their due date. Most arrive within a week before or after. This date is a useful estimate; your healthcare provider may adjust it based on ultrasound measurements, especially during the first trimester.

If your cycles are irregular or you’re unsure of your LMP, an early ultrasound is the most reliable way to determine your due date. This calculator assumes a standard 28‑day cycle, so you should discuss your personal estimate with your doctor.

Pregnancy is divided into three trimesters: first trimester (week 1–13), second trimester (week 14–27), and third trimester (week 28–40). Each trimester brings different developmental milestones for your baby and different changes for you.

Yes. If you know the embryo transfer date, use the conception date method. For a Day‑3 transfer, subtract 3 days; for a Day‑5 blastocyst transfer, subtract 5 days to estimate the conception date, then enter it above. Always confirm with your fertility clinic.

A pregnancy is considered full term between 39 weeks and 40 weeks 6 days. Births before 37 weeks are preterm, and births after 42 weeks are post‑term. Your due date marks the end of the 40th week.
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