When exactly is my baby due?

Find out exactly how far along you are and your estimated due date based on your last period or conception date.

First day of last period

Average cycle length (days)

Estimated Due Date

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Current Pregnancy Week

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The Methodology

Due Date = Last Period + 280 days (Naegele's rule)

This tool uses the verified professional formula shown above. We cite our sources so you can trust every result.

How it works

The standard way to calculate a due date is by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP).