Pregnancy Due Date Calculator

Estimate your baby's due date from the first day of your last menstrual period (LMP).

First day of last period (LMP)

Enter your LMP date.

How it works

The estimated due date (EDD) is calculated using Naegele's rule: 280 days (40 weeks) from the first day of your last period. This is an estimate — only about 1 in 20 babies arrive exactly on the due date.

Is this medical advice?

No. Always confirm with your doctor or an ultrasound scan.