Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
Pregnancy Due Date Calculator — Find Your Baby’s Due Date Free
Pregnancy Due Date Calculator
🤰 Pregnancy Due Date Calculator
Calculate your baby’s due date, pregnancy week, and full timeline
Pregnancy Due Date Calculator (Week, Trimester & Timeline)
Our advanced pregnancy due date calculator helps you estimate your baby’s delivery date and track your pregnancy journey week by week.
How This Calculator Works
This tool calculates your due date by adding 280 days (40 weeks) to your last menstrual period (LMP).
Expert Tips
First Trimester
- Take prenatal vitamins
- Avoid alcohol & smoking
Second Trimester
- Balanced diet
- Regular exercise
Third Trimester
- Prepare hospital bag
- Track baby movements
Your Pregnancy Week by Week
Knowing your due date helps you track your pregnancy journey week by week. Here is what
to expect at each stage.
First Trimester (Weeks 1 to 12)
Your baby develops from a tiny embryo into a fully formed fetus. The heart begins beating around week 6. Morning sickness is most common during this trimester.
Second Trimester (Weeks 13 to 26)
This is often called the honeymoon trimester. Energy returns, morning sickness fades, and you will feel your baby move for the first time — called quickening — around weeks 18 to 22.
Third Trimester (Weeks 27 to 40)
Your baby gains weight rapidly. Common symptoms include back pain, frequent urination, and difficulty sleeping. Your body prepares for labor with Braxton Hicks contractions.
How Due Date is Calculated
Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This is called the Naegele Rule and has been used by doctors worldwide for over 200 years.
Only about 5 percent of babies are born on their exact due date. A normal delivery typically occurs between 37 and 42 weeks of pregnancy.
Important Pregnancy Milestones to Track
- 8 weeks — First ultrasound recommended
- 12 weeks — End of first trimester, miscarriage risk drops significantly
- 20 weeks — Anatomy scan ultrasound
- 24 weeks — Baby is considered viable outside the womb
- 36 weeks — Baby is considered early term
- 40 weeks — Full term due date
When to Call Your Doctor
Contact your healthcare provider immediately if you experience heavy bleeding, severe abdominal pain, reduced fetal movement after 28 weeks, or signs of preterm labor before 37 weeks.
According to the American College of Obstetricians and Gynecologists, regular prenatal care significantly improves outcomes for both mother and baby.
Other Helpful Calculators
If you found this pregnancy due date calculator useful, you might also like our Ovulation Calculator to find your most fertile days, and our Baby Age Calculator to track your baby’s milestones after birth.
Pregnancy Due Date Calculator vs Ultrasound
Many women wonder which is more accurate — a due date calculator or an ultrasound scan.
A due date calculator based on your last menstrual period gives a good estimate, but ultrasound dating is more accurate, especially when done in the first trimester between 8 and 13 weeks.
If your ultrasound due date differs from your calculator date by more than 7 days, your doctor will usually adjust your official due date.
Common Questions About Due Dates
Can stress affect my due date? Stress does not change your due date but can affect labor timing. High stress levels are linked to slightly earlier deliveries in some studies.
Does my baby’s size affect the due date?
Your due date is fixed based on your last period or early ultrasound. Baby size affects growth monitoring but does not change the official due date.
What if I have irregular periods?
If your cycles are irregular, a due date calculator may be less accurate. An early ultrasound is the best way to confirm your due date in this case.
FAQ SECTION
How accurate is a due date calculator?
A due date calculator is accurate within 1-2 weeks. For the most accurate date, combine it with a first trimester ultrasound.
Can my due date change?
Yes, doctors may adjust it after ultrasound.
What is LMP?
LMP means the first day of your last menstrual period.
