Semi truck dimensions come up more than you'd think — for route planning, permitting, or just knowing whether your rig fits under a bridge. Here's what the numbers actually look like, and how federal and Nevada rules factor in.
Standard Dimensions
A standard American semi-truck runs about 72 feet in overall length, 8.5 feet wide, and 13.5 feet tall, with a weight capacity of up to 80,000 pounds. Those numbers shift depending on federal standards, state regulations, and the specific truck type, model, and brand — treat them as a baseline, not a guarantee for your rig.
How Long Is a Semi Truck?
The industry standard measurement is BBC — Bumper to Back of Cab — which typically runs around 10 feet. Overall length from bumper to the back of the trailer averages 72 feet, though the cab itself can range from 9.5 to 15.25 feet depending on features like a sleeper or an extended hood. There's no federal overall length limit on truck-trailer combinations, though individual trailer length restrictions still apply state by state.
What's the Width of a Semi Truck?
Maximum commercial truck width is capped at 102 inches (8.5 feet), not counting mirrors or load-related bulges. Extended features like loading equipment, bumper assemblies, and aerodynamic add-ons have their own rules on how far they're allowed to stick out.
What's the Semi Truck Height?
State height limits generally run 13 to 14 feet, and there's no federal height requirement for trucks — though plenty of individual roads have lower clearance you need to account for on your route.
Semi-Trailer Dimensions
Federal law sets a minimum trailer length of 48 feet for standard tractor-semitrailer combinations, and two-unit configurations can't exceed 65 feet total. Nevada grandfathers in semi-trailers up to 53 feet, with specific requirements on kingpin-to-center-axle distance.
How Much Does a Trailer Truck Weigh?
An unloaded tractor-trailer weighs roughly 35,000 pounds; fully loaded, it can reach 80,000 pounds. Individual semi-trucks range from 10,000 to 25,000 pounds depending on the configuration.
Dimensions at a Glance
- Overall length — around 72 feet, bumper to trailer end
- Width — maximum 102 inches (8.5 feet), excluding mirrors
- Height — 13 to 14 feet depending on state limits
- Minimum trailer length (federal) — 48 feet; Nevada allows up to 53 feet
- Fully loaded weight — up to 80,000 pounds
If dimension or weight questions are tied to a repair or an upcoming inspection, we can walk your rig with you and answer them on-site — call (888) 587-3832 and we'll get you sorted before you're back on the road.