Pregnancy Due Date Calculator
Calculate your estimated due date, current pregnancy week, trimester, and key milestones.
How to Calculate Due Date
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 28-day cycle. If your cycle is longer or shorter, the due date is adjusted accordingly.
Pregnancy Week by Week
Pregnancy is divided into three trimesters. The first trimester (weeks 1-12) involves rapid development of major organs. The second trimester (weeks 13-27) is often called the "golden period." The third trimester (weeks 28-40) is when the baby gains weight rapidly.
Trimester Guide
First trimester: Morning sickness, fatigue, breast changes. Second trimester: Baby movements, anatomy scan at week 20. Third trimester: Braxton Hicks contractions, nesting instinct.