Automation of course registration is a major breakthrough with the advancement in information technology. Registration processes that take longer time most times eating deep into the semester and with laborious inputs from registration officers have evolved into a seamless and easy process due to the development of robust information systems. An information system requires accurate data for it to give a reliable output, so it is of the essence to be able to input accurate credit units of courses to the course registration system. Computing the credit units of courses by students and course registration officers is mostly manual, in this research, automation of this vital pre-process is implemented. The system is built using java programming language which makes it robust, simple and easy to use. It is a credit unit calculator that does not require being online before it can either be deployed or used. The system prompts the user to enter level, the semester, maximum credit load for the semester and their corresponding credit units. At each execution of the system the courses, corresponding credit units, total credit load for the semester is displayed provided the total credit units entered is not greater than the credit load for the semester, otherwise a prompt displays the excess credit units. Subsequent research can enhance the system to be able to send the output of the pre-registration document from the student directly to the registration officer, and also there should be a module embedded to the system that will enable the registration officer to perform the pre-registration document verification. A module to check double registration and determination if a given course is either first or second semester can also be added.