Pregnancy Due Date Calculator

Estimate your baby's due date from your last period, conception date, or ultrasound.

Pregnancy Due Date Calculator

Estimate your baby's due date and track your pregnancy progress.

Calculation Method

First Day of Last Period

Average Cycle Length: 28 days

21 days45 days

How is the Due Date Calculated?

The most common method is Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). Our calculator also adjusts for non-standard cycle lengths and supports conception date and ultrasound-based inputs.