Due Date Calculator

What is a Due Date Calculator?

A due date calculator estimates when your baby is likely to arrive. Most pregnancies last about 40 weeks (280 days) from the first day of your last menstrual period (LMP). This calculator uses Naegele's rule, the standard method used by healthcare providers in the US and worldwide.

How to Use This Calculator

• Last Menstrual Period (LMP): Enter the first day of your last period — the most common method
• Conception Date: Enter the estimated date of conception (usually 14 days after LMP)
• Ultrasound Date: Enter your ultrasound date and gestational age for a more accurate estimate
• Click "Calculate Due Date" to see your estimated delivery date and pregnancy timeline

Understanding Your Results

• Estimated due date: Your baby's expected arrival date (only 5% of babies arrive exactly on their due date)
• Conception window: The most likely days you conceived
• Current trimester: Which stage of pregnancy you're in (1st, 2nd, or 3rd trimester)
• Weeks remaining: How many weeks until your due date
• Baby's zodiac sign: The astrological sign your baby will be born under

Pregnancy Trimesters at a Glance

• First Trimester (Weeks 1-13): Early development, morning sickness, first ultrasound
• Second Trimester (Weeks 14-27): "Honeymoon phase," baby movements felt, anatomy scan
• Third Trimester (Weeks 28-40): Rapid growth, Braxton Hicks, final preparations

Important Milestones

• 📅 Weeks 8-12: First prenatal visit and dating ultrasound
• 📅 Weeks 18-22: Anatomy scan (gender reveal often possible)
• 📅 Weeks 24-28: Glucose screening for gestational diabetes
• 📅 Weeks 36-40: Weekly checkups, group B strep test

Frequently Asked Questions

• How accurate is a due date calculator? — Due dates are estimates. Only about 5% of babies arrive on their exact due date. Most arrive between 38 and 42 weeks.
• What is Naegele's rule? — Naegele's rule calculates due date as LMP + 280 days. It's the standard formula used by OB-GYNs.
• Can I use this calculator if I have irregular periods? — Yes, but an ultrasound-based estimate may be more accurate. Consult your healthcare provider.
• What if I conceived via IVF? — IVF due dates are calculated differently based on embryo transfer date. Consult your fertility specialist.
• When should I tell people I'm pregnant? — Many wait until after the first trimester (12-14 weeks) when miscarriage risk decreases significantly.

Disclaimer

This due date calculator provides estimates for informational purposes only. Every pregnancy is unique, and actual delivery dates vary. Always consult your healthcare provider for personalized medical advice and prenatal care.