Calculator Suite

Pregnancy Weeks Calculator

Calculate gestational age, due date, and track fetal development milestones

Pregnancy Details
Choose your calculation method and enter the appropriate date

Most common method - first day of last period

Calculate from known due date

Calculate from known conception date

The Last Menstrual Period method is the medical standard. Pregnancy is calculated as 40 weeks (280 days) from the first day of your last period.

Month (1-12)

Day (1-31)

Year

Enter the first day of your last menstrual period

Common Scenarios

8 Weeks (First Trimester)
Early pregnancy - first prenatal visits
20 Weeks (Halfway)
Midpoint - anatomy scan time
32 Weeks (Third Trimester)
Final trimester - preparation phase
Due Next Month
Baby due next month
Recent Conception
Conception 2 weeks ago

Key Milestones

Week 12: End of 1st Trimester
Lower miscarriage risk
Week 20: Anatomy Scan
Detailed ultrasound
Week 24: Viability
Survival with medical care
Week 28: 3rd Trimester
Final growth phase
Week 37: Full Term
Ready for delivery
Week 40: Due Date
Expected delivery

Medical Disclaimer

This calculator provides estimates based on standard pregnancy calculations. Always consult with your healthcare provider for personalized medical advice, accurate dating via ultrasound, and pregnancy monitoring.

Pregnancy Formulas
Medical formulas used in pregnancy calculations

Due Date (Naegele's Rule)

EDD=LMP+280 daysEDD = LMP + 280 \text{ days}

EDDEDD = Estimated Due Date

LMPLMP = Last Menstrual Period

Standard 40-week pregnancy

Gestational Age

GA=Days since LMP7GA = \frac{\text{Days since LMP}}{7}

GAGA = Gestational Age in weeks

Conception Date

CD=LMP+14 daysCD = LMP + 14 \text{ days}

Assumes 28-day cycle with day 14 ovulation

Understanding Pregnancy

Gestational vs Fetal Age

Gestational age (medical standard) is calculated from LMP and is about 2 weeks more than fetal age (from conception).

Pregnancy Trimesters

1st: Weeks 1-12 (organ formation), 2nd: Weeks 13-27 (rapid growth), 3rd: Weeks 28-40 (final development).

Important Milestones

Viability at 24 weeks, full-term at 37-42 weeks. Each week brings important developmental changes.

SEO Content Area

Educational articles, pregnancy FAQs, and AdSense placement

Pregnancy Calculator | Calculator Suite