The short answer: A typical semi truck weighs about 20,000 to 25,000 pounds (roughly 9,000 to 11,300 kg) when empty, and up to 80,000 pounds (about 36,000 kg) when fully loaded with a trailer and cargo.
Semi truck weight by type
A semi truck combines a tractor unit and a trailer. Weight depends on whether you mean the tractor alone, the empty rig, or the loaded combination.
| Configuration | Typical weight |
|---|---|
| Tractor unit (cab) alone | 7,000-11,000 kg (15,000-25,000 lbs) |
| Empty trailer | 4,000-6,800 kg (9,000-15,000 lbs) |
| Empty tractor-trailer combo | 13,600-15,400 kg (30,000-34,000 lbs) |
| Loaded tractor-trailer (legal max) | up to 36,000 kg (80,000 lbs) |
| Day-cab tractor | 7,000-9,000 kg (15,000-20,000 lbs) |
What affects semi truck weight
- Cargo load. Freight is the biggest variable, often doubling the empty weight.
- Tractor type. Sleeper cabs are heavier than day cabs.
- Trailer type. Flatbeds, reefers and tankers each weigh differently.
- Number of axles. More axles spread weight and allow higher legal loads.
- Fuel. Large twin tanks add several hundred kilograms when full.
- Legal limits. In the US, gross combination weight is generally capped at 80,000 lbs.
How semi truck weight compares
A fully loaded semi at 80,000 pounds weighs roughly the same as 10 average cars combined, or about six adult African elephants.
Frequently asked questions
What is the legal weight limit for a semi truck?
In the United States, the federal gross vehicle weight limit for a loaded semi is generally 80,000 pounds (about 36,000 kg).
How much does an empty semi truck weigh?
An empty tractor-trailer combination typically weighs around 30,000 to 34,000 pounds (about 13,600 to 15,400 kg).
How much does just the cab of a semi weigh?
A semi tractor unit on its own typically weighs around 15,000 to 25,000 pounds (about 7,000 to 11,000 kg).
