Estimate your baby's expected delivery date with ease
Enter the first day of your last menstrual period
Learn about pregnancy dating and what to expect
Due dates are calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This assumes a regular 28-day cycle with ovulation occurring on day 14.
Pregnancy is divided into three trimesters: First (weeks 1-12), Second (weeks 13-26), and Third (weeks 27-40). Each trimester brings unique developmental milestones for your baby.
Knowing your due date helps healthcare providers schedule important prenatal tests, monitor fetal development, and plan for delivery. It also helps you prepare for your baby's arrival.
Common questions about due date calculations
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