A free app for Android, by Baskaran Arunasalam.

The Pregnancy Calculator app for Android is a free tool to calculate and predict the date of birth of a child. It is designed to help you get the information you need in a simple and convenient way. It is a very useful application that is easy to use and is very accurate. The app is a combination of a pregnancy calendar and a baby tracker. The Pregnancy Calculator app has a built-in pregnancy diary, so you can record the first date of your last menstrual period, the number of days in your menstrual cycle, and other important events that will happen during your pregnancy. It is also possible to add the weight of the baby, the length and the crown-rump length of the baby, and the gender of the baby.

The app is very easy to use. You only need to input the information you know and the app will calculate the date of birth for you.