Question 1

How is the due date calculated?

Accepted Answer

The due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is known as Naegele's rule and assumes a 28-day menstrual cycle.

Question 2

How accurate is the pregnancy week calculation?

Accepted Answer

The calculation is based on standard obstetric dating. Only about 5% of babies arrive on their exact due date — most are born within 2 weeks before or after. Your doctor may adjust dates based on ultrasound measurements.

Question 3

What are the trimesters?

Accepted Answer

First trimester: weeks 1-12 (major organ formation). Second trimester: weeks 13-26 (rapid growth, movement). Third trimester: weeks 27-40 (weight gain, lung maturation, preparation for birth).

Question 4

What milestones are tracked?

Accepted Answer

The tool tracks 12 key milestones from implantation (week 4) through full term (week 37) to due date (week 40). Each milestone includes the date, description, and development highlights.

Pregnancy Calculator

Frequently Asked Questions

Related Tools