✓ Medically Reviewed by Dr. Priya Sammani (MBBS, Medical Officer)
Pregnancy Week-by-Week & Gestational Age Calculator
Calculate your exact pregnancy week and gestational age (weeks + days) from LMP or due date. View current trimester, baby size, and key ultrasound milestones.
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❓ Frequently Asked Questions
How do doctors calculate gestational age?
Obstetric gestational age is counted from the first day of your last menstrual period (LMP), spanning 40 weeks (280 days) to full term.
When do the three pregnancy trimesters start?
First trimester: Weeks 1–12; Second trimester: Weeks 13–27; Third trimester: Weeks 28–40+.
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