How do I calculate my due date?

You can calculate your due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP).

What is a pregnancy week-by-week guide?

A pregnancy week-by-week guide provides information about the changes happening in your body and the baby's development at each stage of pregnancy.

Pregnancy Calendar and Due Date Calculator

Calculate Based On:

Enter Date (mm/dd/yyyy)

Average Length of Cycles From first day of your period to the first day of your next period. Ranges from: 22 to 44. Default = 28 Optional: Leave 28 if unsure.

This is not a diagnosis. The calculations that are provided are estimates based on averages.

Pregnancy Milestones

First Trimester

Important changes and milestones in weeks 1-12

Second Trimester

Baby's development and changes in weeks 13-26

Third Trimester

Preparing for birth in weeks 27-40