Pregnancy Week Calculator
Enter the start date of your last menstrual period to calculate current pregnancy week, due date, trimester, and timeline.
Current week
Due date
Days remaining
Trimester
Pregnancy Timeline
| Phase | Weeks | Month | Date range | Key features |
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How It Works
Pregnancy duration is calculated from the first day of the last menstrual period (LMP). The due date is LMP + 280 days (40 weeks).
Trimesters
- First trimester (Weeks 0-15): Morning sickness, organ formation
- Second trimester (Weeks 16-27): Stable period, fetal movement
- Third trimester (Weeks 28-39): Birth preparation, more checkups
FAQ
Q. How is the due date calculated?
A. The due date is estimated as 280 days (40 weeks) from the first day of your last menstrual period. Actual delivery may vary by several weeks.
Q. What is full term?
A. Full term is defined as 37-41 weeks of pregnancy. Babies born during this period are considered to have reached full development.