Free Health Tool

Pregnancy Due Date
Calculator

Calculate your estimated due date instantly. Track your trimesters, milestones, and how many weeks pregnant you are today.

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Estimated Due Date
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Conception
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Weeks Today
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Days Left
Pregnancy Progress0%
Wk 1–12
1st Trimester
Wk 13–27
2nd Trimester
Wk 28–40
3rd Trimester

🗓️ Key Pregnancy Milestones

🌱Week 4: Positive pregnancy test
❤️Week 6: Heartbeat detectable by ultrasound
🩺Week 8–12: First prenatal visit & NT scan
🔊Week 20: Anatomy ultrasound scan
🤸Week 28: Baby movements become regular
✅Week 37: Full-term pregnancy

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How is the Due Date Calculated?

The most common method is Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a standard 28-day cycle with ovulation on day 14.

If your cycle is longer or shorter, the calculator adjusts accordingly. Only about 5% of babies are born exactly on their due date — most arrive within 2 weeks before or after.

What Are the Three Trimesters?

First Trimester (Weeks 1–12): Major organ development occurs. Morning sickness is common. Risk of miscarriage is highest in this period.

Second Trimester (Weeks 13–27): Often called the "honeymoon phase." Nausea usually subsides. Baby movements begin around week 18–20.

Third Trimester (Weeks 28–40): Baby gains weight rapidly. Braxton Hicks contractions may begin. Delivery typically occurs at 37–42 weeks.

Frequently Asked Questions

How accurate is my estimated due date? ▼
Calculated due dates are estimates. An early ultrasound (before 14 weeks) is the most accurate way to confirm your due date. Only about 5% of babies arrive on their exact calculated due date.
What if I have an irregular cycle? ▼
If your cycles are irregular, the LMP method is less reliable. Using your confirmed ovulation date (from ovulation tests or monitoring) or an early ultrasound will give a more accurate due date.
When is a baby considered full term? ▼
A pregnancy is considered full term at 39–40 weeks. Babies born at 37–38 weeks are "early term," 39–40 weeks are "full term," and 41–42 weeks are "late term." Births after 42 weeks are considered post-term.
⚕️ Medical Disclaimer: This due date calculator is for informational purposes only. Results are estimates and not a substitute for professional prenatal care. Always consult your obstetrician or midwife for medical guidance during pregnancy.