Pregnancy Week Calculator
Enter the first day of your last menstrual period to see your current pregnancy week, approximate months, due date, trimester, and progress percentage.
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Enter the first day of your last period
Understanding Pregnancy Weeks
Pregnancy is counted from the first day of your last menstrual period (LMP). Since conception typically occurs about 2 weeks after the LMP, the gestational age is approximately 2 weeks more than the actual fetal age.
Key Developmental Milestones
- Weeks 4-8: Heartbeat begins, major organs form
- Weeks 12-16: Gender identifiable, baby starts moving
- Weeks 20-24: Hearing develops, active brain growth
- Weeks 28-32: Lung maturation, rapid weight gain
- Weeks 36-40: Full term, ready for delivery