Carnegie Units Carnegie units must be rounded down to the nearest half unit increment. For example, 3.66 units would be 3.5 units. 3.4 units would be 3.0 units, and 3.9 units would be 3.5 units. Carnegie units are always calculated on an 18-week semester format, regardless of the length of course term. Please enter the 18-week standard catalog hours to calculate the Carnegie Units.