Pregnancy Due Date Calculator
Estimate your due date based on your last menstrual period and track your pregnancy progress.
Input Details
Enter the first day of your last period.
Enter your details and click calculate to see your estimated due date and progress.
Trimester 1
Weeks 1-12. Crucial development of organs and limbs starts.
Trimester 2
Weeks 13-26. Physical changes become visible, baby starts moving.
Trimester 3
Weeks 27-40. Final growth spurt and preparation for birth.
About Due Date Calculation
Most pregnancies last around 40 weeks (or 280 days) from the first day of your last menstrual period (LMP). Our calculator uses Naegele's rule, which is the standard method for calculating due dates.
- Average Length: 280 days from LMP.
- Conception: Usually occurs about 14 days after your period starts.
- Accuracy: While useful for planning, only about 4% of babies are born on their exact due date.