Question 1

How is the due date calculated?

Accepted Answer

The standard method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period. If you know the conception date, we add 266 days (38 weeks).

Question 2

How accurate is the due date estimate?

Accepted Answer

Only about 5% of babies are born on their exact due date. Most arrive within two weeks of it. An ultrasound in the first trimester provides the most accurate dating.

Question 3

What are the three trimesters?

Accepted Answer

First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40. A full-term pregnancy is 37-42 weeks.

Question 4

Is this calculator a substitute for medical advice?

Accepted Answer

No. This tool provides an estimate for informational purposes only. Always consult your healthcare provider for prenatal care and medical guidance.