Basketball court dimensions are as follows: #1 NBA/NCAA-regulation basketball court dimension is 94' long by 50' wide. #2 High School basketball court dimension measure 84' long by 50' wide. #3 Jr. High School basketball court dimension measure 74' long and 42' wide. Click here for a diagram layout of basketball court dimensions. Click here to learn how to draw a three point line. A key basketball court dimension for installation purposes is the distance from the baseline to the face of the backboard. In a setting where sanction play will occur the dimension from the baseline to the face of the backboard will be 4'.