A free app for Android, by Baskaran Arunasalam.

A simple and practical tool to calculate the dates of conception, birth, and abortion, as well as the duration of pregnancy and birth.

A tool to calculate the exact day of your last menstrual period (LMP) for pregnancy calculation and to determine the day of conception.

The information provided can be used for planning purposes. It is also useful to keep track of the progression of your pregnancy.

The information in the app is based on the data from the WHO.

You can record the first date of your last menstrual period and the average number of days in your menstrual cycle and the app will answer the questions you have asked.

If you are having trouble with your periods or they are very irregular, the app can help you determine the day of conception by working backward.