🌿 Health → Pregnancy Due Date Calculator
🤰
Pregnancy Due Date Calculator
Calculate your estimated due date and pregnancy milestones based on your last menstrual period.

// Pregnancy Details

days
Estimated Due Date
—
Current Week
—
Trimester
—
Days Remaining
—
⚠️ Disclaimer: This tool is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health decisions.

What is this Tool?

The Pregnancy Due Date Calculator estimates your baby's expected arrival date based on the first day of your last menstrual period (LMP) and your average cycle length. Pregnancy is typically 40 weeks (280 days) from the first day of your LMP. This calculator uses Naegele's rule — the standard medical method used by obstetricians worldwide — adjusted for your specific cycle length.

How to Use This Calculator

1
Enter the first day of your last menstrual period (LMP).
2
Enter your average menstrual cycle length (default is 28 days).
3
Your estimated due date, current pregnancy week, trimester, and days remaining are calculated instantly.
4
Note that only about 5% of babies are born exactly on their due date — most arrive within 2 weeks either side.

Why This Matters

  • Know your expected due date for planning and preparation
  • Track which trimester and pregnancy week you are in
  • Plan prenatal check-ups, scans, and hospital preparations
  • Share accurate information with your gynaecologist
  • Understand key pregnancy milestones and what to expect

Frequently Asked Questions

Q: How accurate is this due date?
A: The estimated due date (EDD) is accurate to within 1-2 weeks for most pregnancies. An ultrasound in the first trimester provides a more precise date. Only 5% of babies arrive on their exact EDD.
Q: What are the three trimesters?
A: First trimester: weeks 1-13. Second trimester: weeks 14-27. Third trimester: weeks 28-40+. Each trimester brings distinct developmental milestones for the baby.
Q: When should I see a doctor?
A: Schedule your first prenatal appointment as soon as you confirm pregnancy, ideally by week 8. Early prenatal care is essential for a healthy pregnancy outcome.
Q: What if my cycle is not 28 days?
A: This calculator adjusts for cycle lengths other than 28 days. If your cycle is longer, ovulation (and thus conception) happens later, pushing the due date forward accordingly.
💡 Pro Tip: Always confirm your due date with your gynaecologist through an early ultrasound scan, especially if your cycle is irregular. An ultrasound between weeks 8-12 is the most accurate way to date a pregnancy.