Towing Capacity Calculator
This combination exceeds a weight rating.
This combination exceeds at least one weight rating. Do not tow it as configured.
- Over GVWR. The loaded vehicle weighs 7,040 lb against a 7,000 lb rating. Tongue weight, passengers, and cargo all count against it.
- Over payload by 40 lb. Reduce cargo, carry fewer passengers, choose a lighter trailer, or move to a weight-distributing hitch and a vehicle with more payload.
| Check | Value | Status |
|---|---|---|
| Payload capacity GVWR − curb weight | 1,500 lb | — |
| Passengers + cargo | 700 lb | — |
| Tongue weight 12% of the trailer | 840 lb | 10–15% — good |
| Payload used | 1,540 lb | OVER |
| Loaded vehicle weight against GVWR | 7,040 lb of 7,000 lb | EXCEEDED |
| Combined weight against GCWR | 14,040 lb of 16,000 lb | Within |
| Max trailer as currently loaded | 8,960 lb | — |
Check these figures against the sticker in your driver's door jamb and your owner's manual. Every vehicle's ratings differ by trim, engine, axle ratio, cab configuration, and equipment — the tow rating in an advertisement is for the lightest configuration of the model and is very often not your vehicle. The door jamb sticker gives your specific GVWR and, on most vehicles, a payload figure for the exact truck as built. Nothing here overrides those numbers.
The limit people hit first is payload, not tow rating. Tongue weight presses down on the tow vehicle's rear axle and counts against payload alongside passengers and cargo, so a truck advertised to tow 12,000 lb often runs out of payload with a 9,000 lb trailer and a family aboard. Tongue weight itself should be 10–15% of trailer weight for a conventional hitch and 15–25% for a fifth wheel — too little is the classic cause of trailer sway, which is violent and difficult to recover from. Also confirm the hitch and ball rating, which is a separate limit again, and consider a weight-distributing hitch on heavier trailers. This is a planning tool, not a substitute for weighing the actual combination at a scale.
Check what you can safely tow using your GVWR and GCWR — including tongue weight and the payload you have left.
Read this first
Verify every figure here against the sticker in your driver's door jamb and your owner's manual. Weight ratings differ by trim, engine, axle ratio, cab and bed configuration, and factory equipment. The towing figure in an advertisement is for the lightest possible configuration of that model and is very often not your vehicle. The door jamb sticker gives your specific GVWR and, on most vehicles, a payload figure for the exact vehicle as built. Nothing on this page overrides those numbers.
How to use this calculator
- Enter GVWR and GCWR from the door jamb sticker and owner's manual.
- Enter the curb weight of the empty vehicle.
- Enter the loaded trailer weight — the trailer plus everything in it, not its empty weight.
- Set the tongue weight percentage: 10–15% for a bumper pull, 15–25% for a fifth wheel.
- Add passengers and cargo in the tow vehicle. Be honest — this is where combinations fail.
The formula
Payload capacity = GVWR − Curb weight · Payload used = Passengers + Cargo + Tongue weight
Max trailer = GCWR − (Curb weight + Payload used) · Tongue weight = Trailer × Tongue %
Worked example — a half-ton truck that fails on payload
GVWR 7,000 lb, GCWR 16,000 lb, curb weight 5,500 lb, towing a 7,000 lb trailer at 12% tongue weight, with 500 lb of people and 200 lb of cargo.
- Payload capacity: 7,000 − 5,500 = 1,500 lb
- Tongue weight: 12% of 7,000 = 840 lb
- Payload used: 500 + 200 + 840 = 1,540 lb
- Payload remaining: −40 lb — over the limit
- Loaded vehicle: 7,040 lb against a 7,000 lb GVWR — over GVWR
- Combined weight: 14,040 lb against a 16,000 lb GCWR — within GCWR
This is the trap. The combination is nearly 2,000 lb under its combined rating and would look entirely fine to anyone checking only the tow rating — yet the truck itself is over its GVWR because tongue weight, passengers, and cargo together exceeded a modest payload. Checking GCWR alone would have missed it.
Payload is the limit you hit first
Manufacturers advertise tow ratings because they are impressive. Payload is the number that actually constrains most real trips, and it is printed in much smaller type.
The reason is arithmetic. A truck rated to tow 12,000 lb might have 1,500 lb of payload. A 12,000 lb trailer at 12% tongue weight puts 1,440 lb on the hitch — leaving 60 lb for the driver, passengers, fuel in the bed-mounted tank, the hitch itself, and anything else. The advertised tow rating quietly assumes a nearly empty truck with one driver and nothing else aboard.
Everything that presses down on the vehicle counts against payload: people, cargo, aftermarket accessories, a bed cover, toolboxes, the weight-distributing hitch hardware, and tongue weight. Add them all before assuming a trailer is within reach.
Tongue weight and trailer sway
Tongue weight is not just a payload problem — it is a stability one, and getting it wrong is genuinely dangerous.
| Tongue weight | Effect |
|---|---|
| Under 10% | Trailer sway — oscillation that builds with speed and is hard to recover from |
| 10–15% | The target range for a conventional bumper-pull hitch |
| 15–25% | Correct for a fifth wheel or gooseneck, where the load sits over the axle |
| Over 15% on a bumper pull | Rear axle overloaded, front end light, steering and braking degraded |
Too little tongue weight is the more dangerous failure. A trailer loaded tail-heavy will begin to oscillate at speed, and each swing feeds the next — the standard advice is to ease off the throttle and apply the trailer brakes only, never the vehicle brakes, but the real fix is loading roughly 60% of the trailer's cargo ahead of its axle so the tongue weight lands in range.
The other limits to check
- Rear axle rating (RGAWR). Tongue weight lands almost entirely on the rear axle and can exceed its individual rating even when GVWR is fine.
- Hitch and ball rating. A separate limit again, stamped on the hitch and the ball, and the lowest-rated component governs.
- Trailer brake requirements, which apply above a stated trailer weight in most jurisdictions.
- Tyre load ratings on the tow vehicle, which must support the loaded axle weights.
- Weight-distributing hitch requirements, often mandated by the manufacturer above about 5,000 lb of trailer.
Weigh it, do not estimate it
This calculator is a planning tool. Trailer weights are routinely underestimated — the dry weight on a brochure excludes water, propane, batteries, and everything you pack, which on a travel trailer can add 1,000 lb or more.
Take the loaded combination to a public scale and weigh it properly: the vehicle alone, the vehicle with the trailer connected, and the trailer alone. That gives you real axle weights and a real tongue weight, and it is the only way to know rather than assume.
Towing beyond a rating lengthens braking distances, degrades stability, stresses the drivetrain and brakes beyond their design, may void warranty coverage, and can affect insurance and liability in an incident. If the numbers here come out marginal, treat that as a no.
How we calculate this
Payload capacity is GVWR minus curb weight. Payload used is passengers + cargo + tongue weight, where tongue weight is the stated percentage of loaded trailer weight — it counts here because it physically presses down on the tow vehicle. Loaded vehicle weight is curb weight plus payload used, and it is checked against GVWR. Combined weight is loaded vehicle plus trailer, checked against GCWR. The maximum trailer figure is GCWR minus the loaded vehicle, so it reflects the vehicle as you have actually loaded it rather than an empty one. A combination passes only when it is inside both ratings and payload is not exceeded.
Sources
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Frequently asked questions
How do I calculate how much I can tow?
Subtract your loaded vehicle weight from the GCWR. Loaded vehicle weight is curb weight plus passengers, cargo, and the trailer's tongue weight. Separately, check that loaded vehicle weight stays under GVWR — that limit is usually the one you hit first, and it is the one people forget.
What is the difference between GVWR and GCWR?
GVWR is the maximum the tow vehicle alone may weigh, fully loaded — including passengers, cargo, and the tongue weight pressing down on the hitch. GCWR is the maximum for the vehicle and trailer combined. You must stay under both, and they are independent limits.
Why does tongue weight count against payload?
Because it physically sits on the tow vehicle. A trailer's tongue presses down on the hitch, which loads the rear axle exactly as cargo in the bed would. At 12% of a 7,000 lb trailer, that is 840 lb of your payload gone before anyone gets in — which is why the payload limit is usually reached long before the tow rating.
How much tongue weight should a trailer have?
10 to 15% of the loaded trailer weight for a conventional bumper-pull hitch, and 15 to 25% for a fifth wheel or gooseneck. Too little is genuinely dangerous — insufficient tongue weight is the classic cause of trailer sway, which builds rapidly at speed and is very difficult to recover from. Adjust it by moving cargo forward within the trailer.
Where do I find my vehicle's towing capacity?
The sticker in the driver's door jamb gives your specific GVWR and, on most vehicles, a payload figure for the exact vehicle as built. The owner's manual gives GCWR and tow ratings. Do not use an advertised figure — those are for the lightest configuration of the model, and are very often not your vehicle.
Why is my payload lower than the advertised towing capacity suggests?
Because they are different limits and manufacturers advertise the flattering one. A truck rated to tow 12,000 lb might have only 1,500 lb of payload, and a 12,000 lb trailer at 12% puts 1,440 lb on the hitch — leaving 60 lb for people. The tow rating assumes a nearly empty truck with one driver.
What is a weight-distributing hitch and do I need one?
It uses spring bars to transfer some tongue weight forward to the front axle and back to the trailer's axles, restoring steering feel and levelling the vehicle. Many manufacturers require one above a stated trailer weight, often 5,000 lb. It helps handling but does not raise your GVWR or GCWR — those are structural limits, not handling ones.
What happens if I exceed my towing capacity?
Braking distances lengthen, handling and stability degrade, and the drivetrain, brakes, and suspension are stressed beyond design. It may void your warranty, and in an incident it can affect insurance and liability. Commercial operators are also subject to roadside weight enforcement. None of these are theoretical risks.