Pregnancy Calculator
Calculate your estimated due date and current gestational age. Track your pregnancy progress by trimester and get key milestone dates.
Standard is 28 days
Enter your LMP or conception date above
Get your estimated due date and pregnancy timeline
⚠️ Medical Disclaimer: This calculator provides estimates for informational purposes only. Every pregnancy is unique. Always consult with your healthcare provider for personalized medical advice, prenatal care, and accurate due date confirmation through ultrasound.
Understanding Your Pregnancy Trimesters
Each trimester brings new developments for both mother and baby
First Trimester
Weeks 1-13
- ✓Baby's heart begins to beat (week 6)
- ✓All major organs form (week 10)
- ✓Morning sickness common
- ✓First ultrasound (8-12 weeks)
Second Trimester
Weeks 14-27
- ✓Feel baby movements (16-22 weeks)
- ✓Anatomy scan (18-22 weeks)
- ✓Gender may be visible
- ✓Energy levels increase
Third Trimester
Weeks 28-40
- ✓Baby gains weight rapidly
- ✓Braxton Hicks contractions
- ✓Glucose screening (24-28 weeks)
- ✓Prepare for delivery
Frequently Asked Questions
What is Naegele's rule for due date calculation?▼
Naegele's rule is the standard method for calculating due date: subtract 3 months from the first day of your last menstrual period, then add 7 days and 1 year. This gives an estimated due date of 40 weeks from LMP.
How accurate is ultrasound dating?▼
First-trimester ultrasounds (8-14 weeks) are most accurate for dating, with an error margin of 3-5 days. Later ultrasounds have larger margins as fetal growth becomes more variable.
What is the difference between gestational age and fetal age?▼
Gestational age is measured from LMP (about 2 weeks before conception). Fetal age is measured from conception. Fetal age is typically 2 weeks less than gestational age.
When should I schedule my first prenatal visit?▼
Most healthcare providers recommend scheduling your first prenatal visit between 8-12 weeks of pregnancy. Earlier visits may be needed for high-risk pregnancies.
What happens if I go past my due date?▼
Only 5% of babies arrive on their due date. Most providers will monitor closely after 40 weeks and may discuss induction if pregnancy continues past 41-42 weeks.