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.