How big is a semi truck?

These are named trailer-only length examples, not a survey of typical truck sizes. Complete combination length depends on the tractor and coupled arrangement. For conventional truck-tractor/single-semitrailer combinations, FHWA describes no overall length limit on the National Network and reasonable-access routes; specialized vehicle rules differ.

On a narrow screen, scroll the comparison sideways to read every label at full size.

Published trailer-only lengths for each named example, with its primary source.

Trailer	Trailer length	What is measured	Source
53-ft flatbed	53 ft	Trailer only	Fontaine Revolution OEM brochure — PDF page 4
48-ft flatbed	48 ft	Trailer only	Fontaine Revolution OEM brochure — PDF page 4
28-ft pup	28 ft	Trailer only	Great Dane Champion OEM brochure — PDF page 7 / printed page 5

This optional worksheet just adds three weights you supply — tractor, empty trailer, and cargo — and totals them. It assumes nothing and is not a scale reading or a legal check. Count fuel, people, and equipment once. Do not reuse a coupled rig’s tractor-axle reading as the tractor weight and then add the full trailer weight too: the trailer already rests part of its weight on the tractor, so you would count it twice. Why these are separate weights.

Tractor weight

lb

The tractor on its own, including fuel, people, and equipment. Not a coupled-rig axle reading.

Empty trailer weight

lb

A real weight for the empty trailer — not a capacity rating. Nothing is filled in for you.

Cargo weight

lb

The weight of the freight on board.

Your total (tractor + trailer + cargo)

Enter all three weights above.

For comparison, the general federal Interstate limit is 80,000 lb. Axle and Bridge Formula limits may require less; exceptions, grandfather rights, and permits can allow more. This worksheet draws no legal conclusion. 23 USC 127. Input caps are software limits, not vehicle or legal limits.

These are general federal standards, not equipment measurements or route-clearance advice. Exceptions apply, and being under one limit does not by itself make a load legal.

Federal width standard

102 in Regulatory equivalent: 2.6 m

National Network and reasonable-access rules, excluding specified safety devices. Hawaii and special-equipment exceptions apply. The 2.6-m regulatory equivalent is not an exact mathematical conversion of 102 inches. source

Federal height limit

None State and route restrictions apply

There is no federal vehicle height requirement. Check the applicable state rules and actual route clearance; this is not a statement of any trailer's height. source

General Interstate gross limit

80,000 lb ≈36,287 kg

The general federal limit, not a measured weight. Axle and Bridge Formula limits may require less; statutory exceptions, grandfather rights and qualifying permits can allow more. source

Each populated specification is a published nominal length for a named manufacturer brochure example, not an independent measurement, current inventory claim or statement about every trailer of that type. Only original manufacturer documents are used for equipment numbers in this dataset. Unknown means not established for that configuration in the reviewed evidence, not proof that no specification exists. Legal standards are separate from equipment specifications and include exceptions. Metric figures are calculated using the cited NIST conversion factors: lengths are displayed to two decimal metres, widths and heights to one decimal centimetre, and worksheet weights to whole units. The width rule's regulatory 2.6-m equivalent is labeled separately. Illustrations compare published lengths only; heights, axle positions and tractor geometry are schematic, not engineering measurements.

Field-by-field primary-source evidence

53-ft flatbed — Fontaine Revolution 52

Published nominal length, not an as-built measurement. Manufacturer brochure LT-078-R24, copyright 2020; current inventory availability is not asserted. Height, axle positions and tractor artwork are schematic.

lengthFt: PDF page 4 of 4, Revolution 52 flatbed caption — “45', 48 or 53' wide spread air ride” (published nominal trailer length).

widthIn: Exterior width not established for this length option in the reviewed brochure.

heightIn: Exterior height not established for this length option in the reviewed brochure.

emptyWeightLb: Approximate model-family weight is not tied to a specific length or as-built option set.

48-ft flatbed — Fontaine Revolution 52

Published nominal length, not an as-built measurement. Manufacturer brochure LT-078-R24, copyright 2020; current inventory availability is not asserted. Height, axle positions and tractor artwork are schematic.

lengthFt: PDF page 4 of 4, Revolution 52 flatbed caption — “45', 48 or 53' wide spread air ride” (published nominal trailer length).

widthIn: Exterior width not established for this length option in the reviewed brochure.

heightIn: Exterior height not established for this length option in the reviewed brochure.

emptyWeightLb: Approximate model-family weight is not tied to a specific length or as-built option set.

28-ft pup — Great Dane Champion

Published nominal length across multiple construction/lining options, not a stock-unit specification. Brochure identifier DMD 0720; current inventory availability is not asserted. Height, axle positions and tractor artwork are schematic.

lengthFt: PDF page 7 of 8, printed page 5, Pup Options — “dry freight 28-foot trailers” (published nominal trailer length).

widthIn: Exterior width not established for the pup options in the reviewed brochure.

heightIn: Exterior height not established; interior/drop-frame dimensions are not substituted.

emptyWeightLb: Configuration-specific empty weight not established in the reviewed brochure.

• FHWA — Federal Size Regulations for Commercial Motor Vehicles Width Requirements; Truck Tractor–Semitrailer Combinations; height discussion · National Network and reasonable-access size rules, exclusions and exceptions. No federal vehicle height requirement. Guidance, not a route-clearance determination. · reviewed 2026-09-13
• U.S. Code — 23 USC 127: Interstate vehicle weight limitations 23 USC 127(a)(2), including axle limits, Bridge Formula and exceptions · General 80,000-pound Interstate gross-weight limit; axle and Bridge Formula limits may be lower. Statutory exceptions, grandfather provisions and qualifying permits can allow more. · reviewed 2026-09-13
• NIST — Guide for the Use of the International System of Units (SI) SP 811 (2008), Appendix B.8: PDF pages 61–62; pound conversion footnote 22, PDF page 65 · Exact conversion factors: 1 ft = 0.3048 m; 1 in = 2.54 cm; 1 lb = 0.45359237 kg. Converted display values are rounded, not new measurements. · reviewed 2026-09-13
• GovInfo — 49 CFR 571.3 vehicle definitions (2025 edition) Definitions of semitrailer and truck tractor; 2025 CFR edition · A semitrailer transfers a substantial part of its weight to another motor vehicle. This supports the worksheet's warning against counting coupled tractor-axle weight and full trailer weight twice; it is not a weighing procedure. · reviewed 2026-09-13

How long is a semi truck?

There is no single length for every semi truck. The examples here are trailer-only published lengths, not complete combination measurements. The tractor and coupled arrangement determine the full rig's length. FHWA describes no overall length limit for conventional truck-tractor/single-semitrailer combinations on the National Network and reasonable-access routes; specialized vehicle rules differ. [FHWA — Federal Size Regulations for Commercial Motor Vehicles]

How much does a semi truck weigh?

Actual weight depends on the equipment and what it carries. The general federal Interstate gross-weight limit is 80,000 pounds, but axle and Bridge Formula limits may require less and statutory exceptions, grandfather rights or qualifying permits can allow more. That legal limit is not an empty or actual truck weight. The worksheet only sums your non-overlapping component weights; it is not a certified scale measurement or a legal-compliance check. [U.S. Code — 23 USC 127: Interstate vehicle weight limitations] [GovInfo — 49 CFR 571.3 vehicle definitions (2025 edition)]

How wide is a semi truck?

A particular trailer's published width is a specification, not a universal rule. FHWA gives a federal width standard of 102 inches and a regulatory equivalent of 2.6 metres for the National Network and reasonable-access routes, excluding specified safety devices. Hawaii and special-equipment exceptions apply. The regulatory equivalent is not an exact unit conversion. [FHWA — Federal Size Regulations for Commercial Motor Vehicles]

How tall is a semi truck?

There is no one height for all semi trucks and no federal vehicle height requirement. State rules and route clearances still apply. The table reports only dimensions established for its named examples; unknown fields are not estimated. [FHWA — Federal Size Regulations for Commercial Motor Vehicles]

Is the trailer length the same as the whole truck length?

No. These are trailer-only lengths. A complete tractor-trailer measurement depends on the tractor and the coupled arrangement. Do not treat the trailer's published length as the full rig's length or calculate combination length by simply adding two uncoupled lengths. [FHWA — Federal Size Regulations for Commercial Motor Vehicles] [GovInfo — 49 CFR 571.3 vehicle definitions (2025 edition)]