Semi Truck and Trailer Dimensions: US Length, Width, Height

A typical US semi truck with a 53 ft trailer is about 70 to 80 ft long (21–24 m), 102 in wide (2.59 m) and 13 ft 6 in tall (4.11 m), and may weigh up to 80,000 lb (36,287 kg) on the Interstate. The 53 ft dry van is the most common trailer, with about 52 ft 6 in (1600 cm) of usable floor inside.

Those are typical figures. Trailers differ by manufacturer and year, and size limits differ by state, so check the spec sheet of your own equipment and the rules on your route. If you plan European freight, read the companion guide to 13.6 m semi trailer dimensions instead, because the sizes and pallets are different.

Semi truck dimensions at a glance

How long is a semi trailer?

Most semi trailers in US freight are 53 ft long (16.15 m) on the outside, and 48 ft (14.63 m) is the older, shorter size still in use. Federal rules work the other way round from what many people expect: they set a 48 ft minimum that states must allow for semitrailers, not a national maximum. Many states allow 53 ft, and limits vary by state.

Federal rules also stop states from capping the overall length of a tractor and single semitrailer on the National Network. Overall length therefore comes from the tractor you use, which is why the figure is a range rather than a single number. A day cab with a 53 ft trailer sits near the low end, and a large sleeper near the high end.

The rule that catches 53 ft trailers is often kingpin to rear axle distance. Many states limit how far the rear axles may sit behind the kingpin, with published limits often around 40 to 43 ft. On a trailer with sliding tandems, that limit decides how far back the axles can go, which in turn affects how weight is shared between the tractor and the trailer axles. Check the state table for your route.

How wide is a semi?

A semi is 102 in wide (8 ft 6 in, 2.59 m). That is the federal width on the Interstate and other designated routes, and mirrors and certain safety devices do not count towards it. Inside a dry van you lose the wall thickness, which leaves about 98–100 in (249–254 cm).

That inside width explains US pallet loading. Two 48 × 40 in pallets side by side take 80 in with the 40 in side across, or 96 in with the 48 in side across. Both fit in a 98–100 in van, but the second leaves very little play, so a dented wall or a damaged pallet can stop it going in.

How tall is a semi truck?

A loaded dry van rig is usually 13 ft 6 in tall (4.11 m). Federal law sets no height limit, and states typically set 13 ft 6 in to 14 ft (4.27 m), with some roads and bridges lower. Treat 13 ft 6 in as your working figure and check the route, because clearance signs are what actually limit you.

Inside height matters more to a planner. A 53 ft dry van offers about 108–110 in (274–279 cm), but the rear door opening is lower, at about 105 in (267 cm), and that is the tallest item you can load through the back.

53 ft and 48 ft dry van inside dimensions

Plan with inside dimensions, not the trailer's name. These are typical values for US trailers, with counts for 48 × 40 in pallets on the floor.

Straight means the 48 in side runs along the trailer, two pallets to a row. Turned means the 48 in side runs across the trailer, which takes 40 in of floor per row instead of 48 in. Turned loading gets more pallets on, but it needs the full width, so it is the first thing to fail in a narrow or worn trailer. These counts are geometric. Check them for your pallet and trailer with the pallet fit calculator.

Reefer dimensions

A 53 ft reefer has the same outside size as a dry van but less room inside. Insulated walls take width, and the cooling unit and front bulkhead take length, so usable floor is often about 50–52 ft and inside width about 96–98 in. Inside height is commonly around 103–105 in (262–267 cm), and on some models the ceiling is lower at the door than at the nose.

Check the door opening separately and keep cargo below any load line, because air has to move around the load. Reefers also lose payload to their own weight, which matters for dense frozen or bottled goods.

Flatbed and step deck dimensions

The freight height limit is simple arithmetic: 13 ft 6 in minus the deck height. A flatbed has no walls, so the whole 102 in is usable, and anything wider usually needs an oversize permit. Rules on overhang past the end of the deck vary by state, so ask before you plan it.

Worked example: will this load fit a 53 ft dry van?

Say you have 24 pallets of 48 × 40 in, each 60 in tall and 1,700 lb, plus 2 pallets of the same footprint that are 90 in tall and 900 lb.

1. 1Floor: 26 pallets is exactly the straight capacity of a 53 ft van, so 13 rows of 48 in take 624 in of the 630 in available. It fits, with 6 in spare.
2. 2Height: 60 in and 90 in are both under the 105 in door. Two 60 in pallets stacked would be 120 in, so the 60 in pallets stay single.
3. 3Weight: 24 × 1,700 + 2 × 900 = 40,800 + 1,800 = 42,600 lb, under the 45,000 lb planning figure, though you still need to check your own tare.
4. 4Axles: a full floor spreads the weight well, but a load this heavy leaves little margin, so check the scale ticket against the 34,000 lb limit on both the drive and trailer tandems. See weight distribution in a trailer.

If the 48 ft van were the only one available, 22 straight would leave 4 pallets behind. Turning them would fit the floor count, at the cost of a tighter load and less room to secure it.

How US and European trailers compare

A 53 ft dry van is longer than the European 13.6 m trailer and about the same height inside as a standard one. The pallets differ too: the European trailer holds 33 Euro pallets, while the US van is usually counted in 48 × 40 in pallets. Do not carry numbers from one market to the other. The European semi trailer guide has the 13.6 m figures, and pallet sizes compares the footprints.

Planning tips

• Keep the measured inside size of your own trailers, because catalogue values are often generous.
• Check the door opening before you plan tall freight. It is lower than the ceiling.
• Use the road transport planning tools to test straight and turned patterns before the truck arrives.
• Plan by the state with the tightest limit on your route, not the state you start in.
• If you plan loads every day, see what truck loading software can do for you.