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Due Date Calculator
Calculate your baby's expected due date and track important pregnancy milestones throughout your journey.
Calculate Due Date
The first day of your last period before pregnancy
Typical range is 21-35 days (average 28 days)
🤰 How Due Dates Work
Due dates are calculated as 280 days (40 weeks) from the first day of your last menstrual period. This is the standard method used by healthcare providers.
- • Only 5% of babies are born on their due date
- • Normal delivery range is 37-42 weeks
- • First-time mothers often deliver later
- • Ultrasound dating may be more accurate
📅 Pregnancy Trimesters
First Trimester: Weeks 1-12
Second Trimester: Weeks 13-28
Third Trimester: Weeks 29-40+
Each trimester brings unique developments and considerations for both mother and baby.
🏥 Important Appointments
- First prenatal visit (8-10 weeks)
- Nuchal translucency scan (11-13 weeks)
- Anatomy scan (18-22 weeks)
- Glucose screening (24-28 weeks)
- Group B strep test (35-37 weeks)
⚠️ Important Notes
- • This calculator provides estimates only
- • Ultrasound dating may be more accurate
- • Consult your healthcare provider regularly
- • Every pregnancy is unique
- • Due dates can change based on medical assessments
Medical Disclaimer
- This calculator provides an estimate only and is not a diagnosis or a substitute for professional medical advice.
- Your due date is an estimate based on Naegele's rule (last period + 280 days). Only about 1 in 20 babies are born on their exact due date; most arrive within two weeks either side.
- Your OB-GYN or midwife will confirm dating with an early ultrasound. Always consult a healthcare provider about your pregnancy.
Your privacy is protected. All calculations happen right on your device. The dates you enter are never sent to our servers or stored anywhere.
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