Pregnancy Due Date Calculator

Calculate your pregnancy due date

Last period date

How to Use

Enter the first day of your last menstrual period. Click Calculate to see your estimated due date.

Frequently Asked Questions

How is the due date calculated?

We use Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period.

How accurate is the due date?

Only about 5% of babies are born on their exact due date. It's an estimate within a 2-week window.