The standard school bus has thirteen rows of seats on each side. However, the number of seating rows depends on the type of vehicle being used.
Manufacturers of school buses determine the maximum seating capacity of each vehicle. The figure is based on the federal standard seat size for school buses, which is 39 inches. In addition to the computation, the number of emergency exits and kind of school bus are also taken into account. The Type A school bus is significantly more compact and intended for students with special needs. The standard Type C school bus seats 72 elementary school students or 41 secondary school students. They have 13 rows of seats with a 16-inch gap between rows on each sides. Type D school buses, which are longer variants of Type C school buses, have at least 15 rows of two seats.