Our due date calculator will estimate your expected due date based on your menstrual cycle length and the date of your last period. The calculator assumes that you are in fact pregnant.
The date is calculated by first determining your last ovulation date and then adding 266 days. This is the standard method for estimating the due date of a pregnancy.
Widgets & Downloads
Due Date Calculator Widget
Add a due date calculator to your website.
Due Date Calculator Software
Download our due date calculator application for your PC.