GVWR is the maximum loaded weight the manufacturer rates a single vehicle for; GCWR is the same figure for a truck and everything it tows; GAWR is the rating for one axle. None of them is what the truck weighs today. They matter because two federal thresholds hang on them: at 10,001 pounds a vehicle used in interstate commerce becomes a commercial motor vehicle under 49 CFR 390.5 and the safety regulations apply, and at 26,001 pounds a CDL is required under 49 CFR 383.5.
The three ratings
| Rating | What it is | Where the definition is |
|---|---|---|
| GVWR, gross vehicle weight rating | "The value specified by the manufacturer as the maximum loaded weight of a single motor vehicle." Truck, fuel, driver, cargo and body all included. | 49 CFR 390.5 |
| GCWR, gross combination weight rating | The greater of (1) a value the manufacturer of the power unit puts on the FMVSS certification label, or (2) the sum of the GVWRs or actual gross weights of the power unit and towed units, whichever combination produces the highest value. Exception: the GCWR is not used to define a CMV when the power unit is not towing anything. | 49 CFR 390.5 |
| GAWR, gross axle weight rating | The manufacturer's rating for the load one axle system can carry, printed on the same certification label as the GVWR. Enforcement of axle loads on the road uses the state's axle limits, not the GAWR, but a loaded axle over its GAWR is an overloaded axle whatever the state limit says. | Certification label under NHTSA's rules (49 CFR part 567) |
Where to find them: the certification label, usually on the driver's door jamb or the door edge, lists the GVWR and each GAWR. The GCWR is in the owner's manual or the body builder's guide, and on some labels. For a trailer, its own certification label carries its GVWR and GAWRs.
Rating versus actual weight
The rules use both. The 390.5 definition of a commercial motor vehicle is satisfied by "a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight, of 4,536 kg (10,001 pounds) or more, whichever is greater". So a pickup with a GVWR of 9,900 pounds that actually weighs 10,200 pounds loaded, or that tows a trailer bringing the combined actual weight over 10,001, is a CMV on that trip. The rating sets a floor; the scale can raise it.
Curb weight, the empty weight with fluids, and payload, the difference between curb weight and GVWR, appear nowhere in the federal safety rules. They matter for not exceeding the GVWR, which is a state overweight and equipment matter, but they do not decide which regulations apply.
Threshold one: 10,001 pounds and the safety regulations
49 CFR 390.5 defines a commercial motor vehicle as any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property that (1) has a GVWR, GCWR, GVW or GCW of 10,001 pounds or more, whichever is greater; or (2) is designed or used to carry more than 8 passengers including the driver for compensation; or (3) is designed or used to carry more than 15 passengers including the driver not for compensation; or (4) carries placarded quantities of hazardous materials.
Cross that line in interstate commerce and, subject to the exceptions in 390.3T(f), the Federal Motor Carrier Safety Regulations apply to the vehicle and its driver: driver qualification under part 391 including the medical certificate (391.41), hours of service and records under part 395, inspection and maintenance under part 396, the driving rules of part 392, and the marking, registration and insurance requirements that come with being a motor carrier. None of that requires a CDL. A driver of a 14,000-pound box truck on interstate runs needs a medical card, a driver qualification file, hours-of-service records (or the short-haul time record) and an annual inspection, with an ordinary license.
The exceptions in 390.3T(f) are narrow: government transportation, "the occasional transportation of personal property by individuals not for compensation nor in the furtherance of a commercial enterprise", corpses and the sick or injured, fire and rescue vehicles in emergency operations, and some 9-to-15 passenger operations. Moving your own furniture in a rented 12,000-pound truck is not commerce; delivering a customer's furniture in the same truck is.
Threshold two: 26,001 pounds and the CDL
49 CFR 383.5 has its own, higher definition of a commercial motor vehicle, the one that decides whether a CDL is needed. A CDL is required for:
- Group A, combination vehicles: a GCWR or actual gross combination weight of 26,001 pounds or more, whichever is greater, "inclusive of a towed unit(s) with a gross vehicle weight rating or gross vehicle weight of more than 4,536 kilograms (10,000 pounds), whichever is greater". Both conditions must hold: a 26,001-pound combination with a 9,000-pound trailer is not Group A.
- Group B, heavy straight vehicles: a GVWR or actual GVW of 26,001 pounds or more, whichever is greater.
- Group C, small vehicles: below those weights but designed to carry 16 or more passengers including the driver, or carrying placarded hazardous materials.
The two definitions produce the familiar bands. Under 10,001 pounds: an ordinary vehicle, no federal safety regulations, unless it is a bus or carries placarded hazmat. From 10,001 to 26,000: a CMV under part 390, safety rules apply, no CDL. From 26,001: a CMV under both parts, CDL required. The class of CDL, and how to get one, is on the CDL classes page and how to get a CDL; the everyday question of whether a given truck needs one is on do you need a CDL.
Worked examples
Example 1. A landscaping company runs a pickup with a GVWR of 10,000 pounds towing a trailer with a GVWR of 7,000 pounds between two states. The GCWR is the sum, 17,000 pounds: a CMV under 390.5, so the driver needs a medical certificate and the company keeps a driver qualification file and hours records. No CDL: the combination is under 26,001.
Example 2. The same company buys a truck with a GVWR of 19,500 pounds and tows the 7,000-pound trailer. GCWR 26,500 pounds, and the trailer is under 10,000, so Group A does not apply; the truck alone is under 26,001, so Group B does not apply. Still no CDL, though the company is now well inside the safety regulations and close to the line. Put a 12,000-pound trailer behind that truck instead and the combination is Group A: 31,500 pounds with a trailer over 10,000. A Class A CDL is required.
Example 3. A rental box truck with a GVWR of 26,000 pounds. No CDL. The same model rated at 26,001 by its manufacturer: Class B CDL. Manufacturers rate some models at 25,999 or 26,000 for exactly this reason.
Intrastate operations
The 390.5 definition speaks of interstate commerce. For trucks that never leave the state, each state adopts its own version of the safety rules, and most use the same 10,001-pound line, but some set a higher intrastate threshold or exempt certain operations. The CDL threshold is federal for all commerce, interstate or not, because part 383 is a licensing standard the states must apply. The difference between the two is on the interstate versus intrastate page.
Weight limits are a separate question
None of these ratings is a legal road weight limit. What a loaded truck may weigh on the interstate is set by 23 CFR 658.17: 80,000 pounds gross, 20,000 on a single axle, 34,000 on a tandem, and the bridge formula between axle groups. A truck can be under its GVWR and over the axle limit, or the reverse. The limits are on the truck weight limits page, and the bridge formula calculator works the axle spacing. Where the limits are checked, and who has to stop, is on the weigh stations page; the stations themselves are in the weigh station directory.
Common mistakes
- Reading the GVWR as a limit on cargo. Payload is GVWR minus curb weight; a 26,000-pound GVWR truck with a 12,000-pound body and chassis carries 14,000 pounds, not 26,000.
- Ignoring the trailer. The GCWR, and the actual combined weight, decide both thresholds for a towing vehicle. A light pickup and a heavy trailer are a CMV together.
- Assuming no CDL means no rules. Between 10,001 and 26,000 pounds the medical certificate, hours of service and inspection requirements all apply in interstate commerce.
- Assuming a CDL is only about weight. Group C brings in 16-passenger vehicles and placarded hazmat at any weight.
- Trusting the door label alone for a modified vehicle. Adding a body or axle does not change the manufacturer's rating; exceeding it is an overload regardless of what the vehicle can physically carry.