The weight of a single-decker bus varies greatly between different makes and models but a typical single-decker bus weighs between 11 and 14 tons. Its weight mainly depends on the year the bus was made, as modern single-decker buses are made out of more lightweight material. The purpose of the bus and how many passengers it is meant to hold are two other factors that affect the weight.
City transit buses tend to weigh more than a traditional school bus. If the bus is loaded with passengers, the weight of the bus is generally double what it would otherwise be when completely empty.