The most common sizes of school buses include small buses, also known as minibuses, which typically have a seating capacity of 15-25 passengers. Medium-sized school buses can carry around 25-40 passengers. While larger buses, often referred to as full-size or standard buses, have a capacity of 40-60 passengers.

In 2026, the seating capacity of buses in Australia varies significantly depending on the vehicle's specific purpose and category. For standard large public transit and school buses, the capacity typically ranges from 43 to 57 seats, with some high-capacity models designed for 60 or more passengers. Smaller "mini-buses," frequently used for airport transfers or community shuttles, generally house between 12 and 24 seats. Australia has strict safety regulations regarding seating; for instance, school buses often utilize a "3-for-2" rule where three primary-school-aged children can sit in a space designed for two adults, though this is being phased out in many states in favor of individual seatbelts. Articulated "bendy" buses found in major cities like Sydney and Brisbane can accommodate around 60 to 70 seated passengers, with additional room for up to 40 or 50 standing commuters. All modern buses must comply with Australian Design Rules (ADR), ensuring that seat spacing and emergency exits are standardized across the fleet to provide a safe and relatively comfortable environment for the millions of Australians who rely on bus transit daily.