An apparatus for calculating a driving path area of a vehicle including a tractor part and a trailer part and a method thereof are provided. A sensor device obtains information about periphery of the vehicle. A processor calculates a drivable area with regard to a road structure identified based on at least one of the information about the periphery of the vehicle or information about a map and calculates one or more driving paths of the tractor part, based on the calculated drivable area. The apparatus for calculating the driving path area of the vehicle accurately determines a risk of a predicted driving path to improve stability of autonomous driving.