Pregnancy Calculator
Calculate due date, pregnancy weeks, and track pregnancy milestones from last menstrual period or conception date.
Pregnancy Due Date Calculator
Calculate due date from last menstrual period
From Conception Date
Calculate pregnancy timeline from known conception date
Pregnancy Timeline by Trimester
Important milestones during pregnancy
First Trimester (Weeks 1-12)
- • Week 4-6: Missed period, pregnancy test
- • Week 8: Baby's heart begins to beat
- • Week 10: Baby is now called a fetus
- • Week 12: End of first trimester
Second Trimester (Weeks 13-27)
- • Week 16: Baby's sex can be determined
- • Week 18-22: Anatomy scan ultrasound
- • Week 20: You may feel baby's first movements
- • Week 24: Baby is considered viable
Third Trimester (Weeks 28-40)
- • Week 28: Third trimester begins
- • Week 32: Baby's bones are hardening
- • Week 36: Baby is considered full-term
- • Week 40: Due date arrives
Pregnancy Calculator Information
How Pregnancy is Calculated
Pregnancy is typically calculated from the first day of your last menstrual period (LMP), even though conception usually occurs about 2 weeks later. A full-term pregnancy lasts about 280 days or 40 weeks from the LMP.
Due Date Accuracy
Only about 5% of babies are born exactly on their due date. Most babies are born within 2 weeks before or after the estimated due date. Your healthcare provider may adjust the due date based on ultrasound measurements.
When to See a Doctor
Schedule your first prenatal appointment as soon as you know you're pregnant, ideally by 8 weeks. Regular prenatal care is important for monitoring both you and your baby's health.
Important Note
This calculator provides estimates for educational purposes. Always consult with your healthcare provider for personalized medical advice and accurate pregnancy dating.