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Vehicle Towing Capacity Calculator

Reviewed by the CalculatorHub team, edited by James Graham. SAE J2807 towing methodology. Last verified 14 June 2026.

Calculate your vehicle's remaining safe towing capacity. Enter the GCWR (from your owner's manual), curb weight, passenger weight, and cargo weight. The calculator shows the maximum trailer weight you can safely tow per the SAE J2807 standard. Never exceed your vehicle's GCWR or its manufacturer-rated tow limit, whichever is lower.

From owner's manual (Gross Combined Weight Rating)
Vehicle weight with full fuel, no people or cargo
Combined weight of all occupants
Gear, tools, hitches loaded in the vehicle
Max tow rating from the owner's manual
6,060.00 lb
11,940.00 lb
11,940.00 lb
1,791.00 lb

Maximum safe trailer weight is the lower of the GCWR-based limit and the manufacturer's rated tow limit. Always verify your specific configuration in your owner's manual.

Towing capacity formula (SAE J2807)

Loaded vehicle weight = Curb_weight + Passengers + Cargo
GCWR-based max trailer = GCWR - Loaded_vehicle_weight
Max safe trailer = min(GCWR_based, Manufacturer_tow_limit)
Max tongue weight = Max_trailer x 0.15

The manufacturer's rated tow limit is typically the lower of the GCWR-based maximum and the ratings of the weakest component (cooling system, transmission, axle, or hitch). Always use the lower figure.

Safe towing checklist

  • Confirm your specific truck configuration: tow rating varies by cab style, bed length, engine, axle ratio, and hitch type. The rating plate in the door jamb specifies your vehicle's exact rating.
  • Check trailer GVWR: the trailer's GVWR (maximum loaded weight) must not exceed your max tow rating.
  • Verify tongue weight: weigh the tongue load and confirm it is 10 to 15% of trailer weight and within vehicle tongue weight limit.
  • Check payload: tongue weight and all passengers and cargo in the truck must not exceed the truck's payload rating.
  • Trailer brakes: US federal law (FMCSR) requires trailer brakes on trailers exceeding 3,000 lb GVWR in commercial use; many states require brakes on any trailer over 1,500 to 3,000 lb.

Towing capacity calculator: frequently asked questions

What is GCWR and how does it determine towing capacity?

GCWR (Gross Combined Weight Rating) is the maximum allowable weight of the towing vehicle plus the fully loaded trailer combined. It is set by the manufacturer and published in the owner's manual. Maximum trailer weight = GCWR minus the weight of the loaded tow vehicle (including passengers and cargo). Since SAE J2807 was adopted in 2012, most major manufacturers test to this standard for their published towing ratings.

What is SAE J2807 and why does it matter?

SAE J2807 is the industry-standard test procedure for measuring towing capacity. It specifies test conditions including a 12% grade ramp, ambient temperature of 100 degrees F, a 500-mile highway run, and an acceleration performance test. Before J2807, manufacturers used inconsistent methods, making comparisons unreliable. Trucks rated after 2012 that comply with J2807 can be directly compared with each other.

What is tongue weight and why does it matter?

Tongue weight is the downward force the trailer hitch places on the tow vehicle's hitch. It is a separate limit from trailer weight. Industry standard is that tongue weight should be 10 to 15% of the total loaded trailer weight. Too little tongue weight causes trailer sway; too much tongue weight overloads the rear axle and can exceed the vehicle's payload capacity. Tongue weight is measured with a dedicated scale or a hitch scale.

Do I need a weight distribution hitch?

A weight distribution hitch (WDH) is recommended for trailers exceeding 50% of the tow vehicle's weight. A WDH distributes some tongue weight to the front axle and all four tires, restoring steering and braking. It is required by most manufacturers when tongue weight exceeds 350 lb for half-ton trucks, and is mandatory to maintain the full published towing rating on many vehicles.

Does trailer weight affect fuel economy?

Significantly. The EPA's fueleconomy.gov notes that towing a 5,000 lb trailer can reduce fuel economy by 30 to 50% depending on terrain, speed, and trailer aerodynamics. A truck achieving 20 MPG unloaded may get only 10 to 14 MPG while towing. Fuel economy drops more steeply at speeds above 55 mph because aerodynamic drag increases with the square of speed.

Official sources

Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.