Calculate your expected due date, current week & trimester with a detailed pregnancy timeline
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Calculate your expected due date and track pregnancy week by week. See milestones, trimester progress, and important dates.
Pregnancy Due Date Calculator is a free tool that estimates your baby's due date based on the first day of your last menstrual period (LMP). It provides a week-by-week pregnancy timeline with milestones, trimester visualization, and important dates throughout your pregnancy journey.
The calculator uses Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period. It then generates a complete timeline showing which week you're in, baby development milestones, and trimester boundaries.
Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after.
It calculates the due date by adding 280 days to the first day of your last menstrual period.
Schedule your first prenatal visit as soon as you suspect pregnancy, usually around 6-8 weeks.