Pregnancy Week Calculator
Track your pregnancy week, trimester & due date instantly
Pregnancy Progress Result
Your Baby This Week
Enter your LMP date to see development info.
What is a Pregnancy Week Calculator?
A pregnancy week calculator helps expectant mothers track their pregnancy journey from the first day of their last menstrual period (LMP). It instantly calculates how many weeks pregnant you are, which trimester you're in, your expected due date, and what stage of development your baby has reached — all without needing a doctor's visit.
How is pregnancy week calculated?
Pregnancy is counted from the first day of your last menstrual period (LMP), not the date of conception. A full-term pregnancy lasts approximately 40 weeks (280 days) from the LMP. This due date calculator uses that standard to estimate your due date and progress.
What are the three trimesters?
First Trimester (Weeks 1–12) — Rapid early development. The embryo forms vital organs.
Second Trimester (Weeks 13–26) — The baby grows significantly; many women feel movement.
Third Trimester (Weeks 27–40) — Final growth phase, preparing for birth.
How accurate is this pregnancy tracker?
This pregnancy tracker uses the standard obstetric calculation (Naegele's rule): LMP + 280 days = Due Date. It's accurate for women with regular 28-day cycles. Always confirm dates with your OB/GYN, who may adjust estimates based on ultrasound measurements.
When should I see a doctor?
As soon as you suspect pregnancy, schedule your first prenatal appointment. Early prenatal care is important for a healthy pregnancy. This tool is for informational purposes only and does not replace professional medical advice.
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