Calculate your estimated due date and track your pregnancy journey. Find out how far along you are, which trimester you're in, and important milestones throughout your pregnancy.
Enter the first day of your last menstrual period. This is the most common method used to calculate due date.
If you know when you conceived or ovulated, enter that date for a more accurate calculation.
For IVF pregnancies, enter your embryo transfer date and the age of embryo at transfer.
Enter the date of your ultrasound and the gestational age determined by the scan.
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Only about 5% of babies are born on their exact due date. Most babies arrive within this window:
Initial blood work, urine tests, blood pressure monitoring, and fetal heart rate checks.
More frequent monitoring, glucose screening, and Group B strep test.
Cervical checks, fetal position assessment, and birth preparation discussions.
Due date calculations are estimates. Only about 5% of babies are born on their exact due date. Most babies arrive between 37-42 weeks. Ultrasound dating in the first trimester is typically most accurate (within 5-7 days).
Different methods can provide varying degrees of accuracy depending on your situation. LMP is most common but assumes regular 28-day cycles. Conception date is more accurate if known. IVF provides very accurate dates since fertilization is known. Ultrasound can confirm or adjust dates.
If your cycle is longer than 28 days, ovulation likely occurred later, and your due date may be later. If shorter, you may have ovulated earlier. Our calculator adjusts for cycle length when using the LMP method.
Schedule your first prenatal appointment as soon as you have a positive pregnancy test, ideally around 8 weeks. If you have a history of pregnancy complications, see your doctor earlier.
Gestational age counts from the first day of your last menstrual period (LMP), which is about 2 weeks before conception. So when you're "4 weeks pregnant," your baby is actually about 2 weeks old since conception.
Yes, your healthcare provider may adjust your due date based on ultrasound measurements, especially if there's more than a week's difference between LMP and ultrasound dating. First-trimester ultrasounds are most accurate for dating.
This calculator provides estimates for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for accurate pregnancy dating and personalized prenatal care.