Pregnancy wheelThe other way to calculate your due date is to use a pregnancy wheel. This is the method that most doctors use. It’s very easy to estimate your due date if you have access to a pregnancy wheel.The first step is locating the date of your LMP on the wheel. When you line up that date with the indicator, the wheel displays your due date.Remember that the due date is only an estimate of when you will deliver your baby. The chances of actually having your baby on that exact date are very slim.