Gross Combined Weight Calculator
A gross combined weight calculator helps you estimate how much your tow vehicle and trailer weigh together when both are loaded. For SUV owners planning a camping trip, a move, or a weekend on the water, this total is a useful starting point for checking a towing setup.
Enter the unloaded weight of each vehicle and the weight added to each one. The calculator adds those four amounts and displays the estimated Gross Combined Weight in pounds. You can then compare the estimate with the manufacturer’s gross combined weight rating and review the other limits that apply to your setup.
What the Gross Combined Weight Calculator does
The Gross Combined Weight Calculator estimates the actual combined weight of a tow vehicle and its trailer. It accounts for the tow vehicle, its passengers and cargo, the trailer, and the cargo placed on or inside the trailer.
For example, a loaded SUV pulling a loaded travel trailer has a combined weight made up of both complete vehicles and everything they carry. This total is different from the weight of the trailer alone and different from the tow vehicle’s weight when it is not connected to a trailer.
The result is an estimate based on the numbers you enter. It does not determine whether your SUV, trailer, hitch, tires, or axles are within their rated limits. A certified scale can provide an actual measurement of the loaded combination.
How to use the Gross Combined Weight Calculator
Enter each weight in pounds (lb). Use weights that reflect your planned trip as closely as possible:
- Unloaded tow vehicle weight: Enter the weight of the SUV, truck, or other vehicle before adding the people and cargo you plan to carry.
- People and cargo added to vehicle: Add the weight of the driver, passengers, luggage, equipment, and other items placed in the tow vehicle that are not already included in its unloaded weight.
- Unloaded trailer weight: Enter the trailer’s weight before adding the cargo you plan to carry in or on it.
- Cargo added to trailer: Enter the weight of the equipment, supplies, or other load added to the trailer that is not already included in its unloaded weight.
The calculator displays the sum as Gross Combined Weight, rounded to a whole pound. The default values provide an illustrative example; replace them with figures that match your vehicle, trailer, and load.
Check what each unloaded weight already includes. Fuel, fluids, accessories, and installed equipment may be included in a listed or measured weight, but that depends on the source. Add anything missing to the appropriate vehicle or trailer load. This helps you avoid both omissions and double counting.
Do not add trailer tongue weight separately. The trailer’s full weight already includes the portion transferred through the hitch to the tow vehicle. Adding tongue weight again would inflate the combined total.
How the Gross Combined Weight Calculator formula works
The calculator adds the unloaded weight and added load for the tow vehicle and trailer:
Gross Combined Weight = Unloaded tow vehicle weight + People and cargo added to vehicle + Unloaded trailer weight + Cargo added to trailer
Consider the calculator’s default example:
- Unloaded tow vehicle weight: 4,500 lb
- People and cargo added to vehicle: 600 lb
- Unloaded trailer weight: 2,500 lb
- Cargo added to trailer: 1,000 lb
Adding these amounts gives 4,500 + 600 + 2,500 + 1,000 = 8,600 lb. The estimated Gross Combined Weight is therefore 8,600 lb.
In this example, the loaded tow vehicle accounts for 5,100 lb before considering weight transferred through the hitch, and the loaded trailer accounts for 3,500 lb. Their sum is 8,600 lb. The example assumes each unloaded weight already includes any fuel, fluids, and equipment present; anything missing must be included in the relevant added load.
As another example, a 6,000 lb tow vehicle carrying 1,000 lb and pulling a 4,000 lb trailer carrying 2,000 lb has an estimated combined weight of 13,000 lb. These examples illustrate the calculation and do not represent towing ratings for any particular vehicle.
Use cases for the Gross Combined Weight Calculator
This calculator can help you plan a range of SUV and trailer trips:
- Travel trailer trips: Estimate the combined weight after accounting for passengers, luggage, camping supplies, and items loaded into the trailer.
- Boat towing: Include the boat and other equipment in the appropriate trailer weight or added load, taking care to count each item once.
- Utility trailer loads: Estimate how tools, landscaping supplies, or moving boxes affect the total weight of the combination.
- Comparing packing plans: Update the added-load figures to see how carrying more passengers or cargo changes the estimated total.
- Preparing for a scale visit: Build an estimate before weighing the loaded combination, then compare it with the measured result.
Moving cargo from the SUV to the trailer generally does not change the combined weight if the same items remain in the combination. It can, however, change how the weight is distributed across the vehicle, trailer, hitch, and axles. That distribution matters when checking the individual ratings.
Other factors to consider when calculating Gross Combined Weight
Gross combined weight rating, or GCWR, is the manufacturer’s maximum rating for the combined tow vehicle and trailer under the applicable specifications. Gross combined weight is the actual or estimated weight of your particular loaded combination. Compare the calculator’s result with the GCWR for your specific vehicle and configuration, using the manufacturer’s information.
A combined weight below the GCWR does not establish that every part of the setup is within its limits. Check the tow vehicle, trailer, axle, hitch, and tire ratings separately. Consult the relevant manufacturer documentation and labels to identify the limits that apply to your equipment.
Trailer tongue weight also needs its own consideration. Although it should not be added a second time to this calculator’s combined total, the load transferred through the hitch affects the tow vehicle and hitch. This calculator does not measure tongue weight or determine whether it is suitable for your setup.
Estimates can be inaccurate when unloaded weights come from a generic listing or when small items are left out. Options and equipment can affect the weight of a particular SUV or trailer. Supplies, fluids, passengers, and cargo can also change from one trip to another. Use the most relevant weights available and update the inputs when your load changes.
For a more reliable assessment, weigh the combination in its actual loaded condition on a certified scale. Follow the scale’s instructions and use appropriate separate measurements when checking vehicle and axle loads. The calculator is a planning aid; it does not assess towing safety or confirm compliance with any rating.
Gross Combined Weight Calculator FAQ
What is gross combined weight?
Gross combined weight is the total actual weight of a loaded tow vehicle and its loaded trailer. It includes the vehicles, people, cargo, and other items carried as part of the combination.
Is gross combined weight the same as GCWR?
No. Gross combined weight is the actual or estimated weight of the loaded combination. GCWR is the manufacturer’s rating for the maximum combined weight under the applicable specifications. Compare the two, and check the other relevant ratings separately.
Should I add tongue weight to the result?
No. The trailer’s full weight is already included in the calculation, including the portion transferred through the hitch. Adding tongue weight separately would count that portion twice. Tongue weight still matters when checking the tow vehicle and hitch limits.
Do passengers and luggage count toward gross combined weight?
Yes. Include the driver, passengers, luggage, and other items added to the tow vehicle in the People and cargo added to vehicle input, unless their weight is already included in the unloaded figure you are using.
How can I find the actual combined weight?
Load the tow vehicle and trailer as you intend to use them, then weigh the combination on a certified scale. The calculator provides an estimate from your inputs; a scale measures the weight of the combination as loaded at that time.