Pregnancy Week Calculator
Calculate how many weeks pregnant you are based on your last menstrual period. See milestones and trimester info.
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Trimester Overview
First Trimester (Weeks 1-12)
Early development. Organs begin forming.
Second Trimester (Weeks 13-26)
Growth phase. Movement felt, gender identifiable.
Third Trimester (Weeks 27-40)
Final growth. Baby gains weight, prepares for birth.
How It Works
Enter the first day of your last menstrual period (LMP) to calculate your current pregnancy week, estimated due date, and see relevant milestones.
Trimesters
- First Trimester: Weeks 1-12
- Second Trimester: Weeks 13-26
- Third Trimester: Weeks 27-40
Disclaimer
This is an estimate only. Consult your healthcare provider for accurate dating.
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Disclaimer: This tool is provided as-is for informational and educational purposes only.