Pregnancy Due Date Calculator
Track your pregnancy journey week by week with accurate milestone predictions
Health Disclaimer: This calculator provides estimates based on average pregnancy durations. Every pregnancy is unique, and due dates can vary. This tool is for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized guidance throughout your pregnancy.
Tip: For the most accurate calculation, use the first day of your last menstrual period or your confirmed conception date if you know it.
The average cycle is 28 days, but can range from 21 to 35 days
Additional Information (Optional)
Your Pregnancy Timeline
Due Date:
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Current Week:
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First Trimester:
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Second Trimester:
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Third Trimester:
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Conception Date (est.):
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Pregnancy Progress
0% complete
Current Development Milestone
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Upcoming Important Dates
- First ultrasound: --
- Gender reveal possibility: --
- Viability milestone: --
- Full term begins: --
Understanding Your Pregnancy Journey
First Trimester (Weeks 1-12)
- Morning sickness may peak
- Baby's major organs forming
- Highest risk period for miscarriage
- First heartbeat detectable (weeks 6-7)
Second Trimester (Weeks 13-27)
- Many women feel best during this time
- Baby's movements become noticeable
- Gender can often be determined
- Baby grows from 3 to 12 inches
Third Trimester (Weeks 28-40)
- Baby gains most of their birth weight
- Lungs fully develop in final weeks
- Baby moves into birth position
- More frequent doctor visits
- Practice contractions (Braxton Hicks) may begin
"Our pregnancy calculator has helped over 50,000 expectant parents prepare for their baby's arrival with accurate timeline predictions."
Key Pregnancy Milestones
Weeks 8-10
Baby is now officially called a fetus and is about the size of a grape. All essential organs have begun to form, and the heart beats 160-180 times per minute (about twice as fast as yours). This is a critical period for development, so maintain prenatal care.
Weeks 18-22
Many parents have their anatomy scan ultrasound during this period, where you might learn your baby's sex if you choose. Your baby can now hear sounds and may respond to your voice. You'll likely feel the first kicks and movements, often described as "quickening."
Weeks 37-40
Your baby is considered full term at 37 weeks and is preparing for birth. The average newborn weighs about 7.5 pounds and measures 20 inches long. The baby's position becomes important now, with most moving into the head-down position for birth.
Pro Tip: Only about 5% of babies are born on their exact due date. Most arrive within a two-week window before or after the calculated date. Pack your hospital bag by week 36 to be prepared!
Frequently Asked Questions
How accurate is the pregnancy calculator?
Our calculator uses standard medical guidelines to estimate your due date, typically accurate within 1-2 weeks. Remember that only about 5% of babies are born exactly on their due date. The calculation is most accurate when based on a regular menstrual cycle or confirmed conception date.
Why does pregnancy count from my last period and not conception?
Medical convention counts pregnancy as 40 weeks from the first day of your last menstrual period (LMP), which is typically about 2 weeks before conception occurs. This standard developed because the LMP date is easier for most women to identify with certainty than the actual conception date.
What if I have irregular periods?
If your cycles are irregular, the standard calculation may be less accurate. In this case, an early ultrasound (between 6-10 weeks) provides the most reliable due date estimation. Your healthcare provider can adjust your due date based on ultrasound measurements.
Can my due date change during pregnancy?
Yes, your healthcare provider might adjust your due date based on ultrasound measurements, especially in the first trimester. Later in pregnancy, your due date typically remains fixed even if ultrasounds suggest a different fetal size, as growth rates vary in the second and third trimesters.
What should I do after calculating my due date?
After calculating your due date, schedule your first prenatal appointment. Most providers want to see you between 8-12 weeks, though some prefer an earlier visit. Start taking prenatal vitamins if you haven't already, and consider lifestyle adjustments like eliminating alcohol and reducing caffeine intake.