A semi truck, also known as an 18-wheeler or tractor-trailer, typically weighs between 30,000 and 35,000 pounds when empty (unladen), which includes the tractor (cab) and the trailer combined
- The tractor (cab) alone usually weighs between 10,000 and 25,000 pounds, depending on factors like engine type, whether it has a sleeper or day cab, and fuel load
- The trailer typically weighs about 10,000 pounds when empty, with variations depending on length (e.g., 4,500 pounds for a 28-foot pup trailer, 9,000-14,000 pounds for trailers 48-53 feet long)
When fully loaded with cargo, fuel, passengers, and accessories, the total weight of a semi truck can reach up to the legal maximum of 80,000 pounds (40 tons) in the United States
. This maximum weight is regulated to ensure safety and protect infrastructure.
Summary:
- Empty semi truck (tractor + trailer): ~30,000 to 35,000 pounds
- Tractor (cab) alone: 10,000 to 25,000 pounds
- Empty trailer: ~10,000 pounds (varies by length)
- Fully loaded semi truck (maximum legal weight): up to 80,000 pounds
This weight range explains why semi trucks are much heavier than passenger vehicles and require strict regulations for safe operation on roads
