GVWR Calculator

Gross Vehicle Weight Rating (GVWR) is the loaded weight assigned by the manufacturer to a single vehicle. It is a rating, not the vehicle's present scale weight. The actual gross vehicle weight includes the vehicle, occupants, cargo, and installed equipment. The National Highway Traffic Safety Administration (NHTSA), May 6, 1974 defines both GVWR and the separate gross axle weight ratings (GAWR).

Curb weight already includes a full fuel tank, oil, and coolant under the NHTSA curb-weight definition (February 21, 1986). Do not add full fuel a second time. Some optional or aftermarket equipment may not be included in a published curb figure; include its additional weight in the cargo field. If you use an actual scale weight in place of curb weight, exclude any occupants and cargo that you also enter in separate fields.

Enter the curb weight of your vehicle in pounds, cargo and equipment not included in that figure, all passengers, and the GVWR shown by the manufacturer. The calculator uses estimated loaded weight = curb weight + cargo + passengers, remaining amount = GVWR − estimated loaded weight, and load percentage = estimated loaded weight ÷ GVWR × 100.

For example, 4,000 lb curb weight + 500 lb cargo + 300 lb passengers = 4,800 lb loaded weight. Against a 6,000 lb GVWR, the difference is 1,200 lb and the result is 80% of GVWR. A negative difference means the estimate exceeds the entered rating. The comparison is only as accurate as the entered weights; a scale can establish actual loaded weight.

A result below GVWR alone does not establish that a vehicle is safe or legally cleared. Front and rear axle loads can differ even when total weight is below GVWR. Check each axle against its GAWR and the tires against their ratings and inflation requirements. The GM 2010 Chevrolet Silverado owner manual, section 5-33 (archived by NHTSA) describes the certification/tire label and recommends weighing the loaded vehicle by axle.

When towing, trailer tongue or kingpin load carried by the vehicle adds to its load. Trailer GVWR, gross combination rating, hitch limits, and local road rules are separate checks. Secure and distribute cargo according to the vehicle and equipment instructions.

Where can I find GVWR?

Use the vehicle's manufacturer certification label, commonly near the driver's door, and confirm against its owner information. The rating is vehicle-specific.

Is GVWR towing capacity?

No. GVWR describes the loaded vehicle itself. Trailer and combination ratings describe different limits. Tongue or kingpin weight borne by the vehicle still contributes to its actual loaded weight.

Should I add fuel separately?

No if you use curb weight as defined with a full fuel tank. If you use an actual measured vehicle weight, use its measured fuel state and add only loads that were absent when it was weighed.