A free app for Android, by Quartertone.
OB Wheel: Pregnancy calculator is an application that was created to offer an easy and accurate way of calculating the date of pregnancy and the month in which it occurs. This date is the most important one for parents, so it is important to be aware of it. OB Wheel is a pregnancy calculator that was created with a high degree of accuracy and is based on the most recent studies and recommendations.
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How can I use OB Wheel?
To use OB Wheel, first, make sure that you have your period tracked and that you know the date of the last one. If you don't know the exact date of the last period, the app will inform you of the current average period length.
Once you know your last menstrual period date, it's time to start. First, you need to find your exact date of pregnancy. For that, you need to enter the information about your pregnancy.