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妊娠予定日計算機

最終月経日または受精日に基づいて、出産予定日、妊娠週数、妊娠期を計算

Due date = LMP + 280 days (Naegele's rule)

This calculator provides estimates only. Actual due dates and milestones should be confirmed with a healthcare professional. Only about 5% of babies are born on their exact due date.

Pregnancy Due Date Calculator

Calculate your pregnancy due date, current week, and trimester based on last menstrual period (LMP) or conception date. Includes a week-by-week milestone timeline.

Pregnancy timeline overview

First trimester (Weeks 1–13)

Organ formation begins. Morning sickness common weeks 6–12. First ultrasound typically at 8–12 weeks.

Second trimester (Weeks 14–27)

Baby movements felt (quickening) around week 18–22. Anatomy scan ultrasound at week 20.

Third trimester (Weeks 28–40)

Rapid weight gain. Baby positions for birth. Full term at 39–40 weeks.

Due date accuracy

Only ~4% of babies arrive on their exact due date. Normal delivery is any time between 37–42 weeks.

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