Pregnancy Due Date Calculator

Calculate your estimated due date and pregnancy timeline

First Day of Last Menstrual Period (LMP)

Frequently Asked Questions

How is the due date calculated?▼

Due date = Last Menstrual Period (LMP) + 280 days (40 weeks). This is known as Naegele's rule.

How accurate is the due date?▼

Only about 5% of babies are born on their exact due date. Most are born within 2 weeks before or after. The due date is an estimate.