How much tongue weight is safe?
CURT's range is about 10–15% of gross trailer weight. Twelve percent is this calculator's midpoint of that band, not a separate standard.
The band, by trailer weight
| Loaded trailer | 10% floor | 12% midpoint | 15% ceiling |
|---|---|---|---|
| 2,000 lb (utility) | 200 lb | 240 lb | 300 lb |
| 3,500 lb (pop-up/small boat) | 350 lb | 420 lb | 525 lb |
| 5,000 lb (single-axle camper) | 500 lb | 600 lb | 750 lb |
| 7,000 lb (travel trailer) | 700 lb | 840 lb | 1,050 lb |
| 10,000 lb (large trailer) | 1,000 lb | 1,200 lb | 1,500 lb |
Hitch class for the 7,000 lb row: what size hitch for a 7,000 lb trailer.
Why the band — what each side does
Under 10% — sway. CURT says too little tongue weight may let the trailer sway. NHTSA says the same, and says sway is more likely as speed increases. This page does not name a speed. If the trailer is already swaying and you have an electric brake controller, NHTSA says to use that controller by hand and not the tow vehicle's brakes. Then stop and move cargo forward. The calculator's point under the floor is on trailer sway.
Over 15% — less steering. CURT says too much tongue weight makes the vehicle less responsive when turning and braking. NHTSA says too much tongue weight unloads the front wheels. A weight-distribution hitch can transfer weight to the front axle. Shift cargo only after you measure. The 16 percent example below is the heavy side of this function.
Three ways to measure it
The procedures, distances, and the 300 lb bathroom-scale line are CURT's, written out on the tongue weight guide. Short version:
- Under 300 lb: a bathroom scale under the jack, with plywood to protect the scale.
- Over 300 lb: CURT's lever, block about 1 foot from the tongue and scale about 2 feet away on the opposite side, then multiply the reading by 3.
- Vehicle scale: weigh the tow vehicle alone, then hitched with the trailer wheels off the scale. The difference is tongue weight. A CAT Scale visit with the trailer on its own platform is axle weight, not this subtraction. See how to weigh a truck and trailer. This page does not state a scale price.
Measure the trailer loaded the way you will tow it.
Tongue weight vs the rest of the rig
Tongue weight also counts against payload. Hitch hardware counts after you weigh it. This page does not publish a hitch weight or a sample payload. Run the stack in the payload calculator, then match the receiver in what size hitch for my trailer and the weight-distribution notes in best hitches and weight distribution.
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Tongue-weight scales, adjustable ball mounts for shifting the ball rearward (raises effective tongue weight), and WDH bars by bracket are all standard stock. tongue scales on Amazon · adjustable ball mounts on Amazon
Moving the number: cargo placement
Measure, then move cargo, then measure again. Cargo ahead of the trailer axles raises tongue weight. Cargo behind the axles lowers it. This page does not assign a multiplier to that move, and it does not assign pounds per inch of ball position. NHTSA says a weight-distribution hitch transfers weight to the front axle. This page does not claim that transfer leaves a scale's tongue-weight percentage unchanged.
Tongue-weight scales, adjustable ball mounts for shifting the ball rearward (raises effective tongue weight), and WDH bars by bracket are all standard stock. tongue-weight scales on Amazon · adjustable ball mounts on Amazon
When the tongue is over the band
CURT's published range is about 10 to 15 percent of gross trailer weight. One point past that ceiling is enough to change this site's verdict. The example uses a 5,000 lb loaded trailer and a measured tongue percentage of 16. Sixteen percent is a demonstration of the line the function draws. It is not a target, and it is not a recommended load.
Inputs to TTC.tongueWeight: trailer weight 5,000 lb, measured percentage 16.
| Output | Value |
|---|---|
| Tongue weight | 800 lb |
| Percent of trailer | 16% |
| 10% floor the function prints | 500 lb |
| 12% midpoint the function prints | 600 lb |
| 15% ceiling the function prints | 750 lb |
| Verdict | TOO HEAVY — overloads rear axle and unsteers the tow vehicle |
Eight hundred pounds is also CURT's Class 3 weight-carrying tongue cap. The same pounds can be a class limit and a percentage failure at the same time. For comparison, the same function at 10 percent of 5,000 lb returns 500 lb and "In the safe 10–15% band," with the same 500 / 600 / 750 lb targets. The 12 percent figure is this calculator's midpoint of CURT's band.
NHTSA's account of the heavy side is specific: too much tongue weight can leave not enough weight on the front wheels, and the tow vehicle is then less responsive to steering. A weight-distributing hitch can remedy that by transferring weight to the front axle. This page does not add a claim about whether that hitch changes the percentage you would read on a scale. Shift cargo only after you have measured the loaded tongue, using one of the methods above, and re-run the tongue-weight tab. If the front end is light and you are not sure the bars are the right hardware, stop and use a hitch shop rather than adding load to the rear bumper to "fix" the percentage.
Compiled with AI assistance from the sources below. Spot an error? Email jpanasuk@gmail.com.
Sources for the heavy-tongue example
- CURT, "How to Measure Tongue Weight." https://www.curtmfg.com/trailer-parts/couplers/learn-more. Accessed October 3, 2026.
- CURT Manufacturing, "Types of Trailer Hitches and Hitch Classes." https://www.curtmfg.com/types-trailer-hitches. Accessed October 3, 2026.
- NHTSA, "Towing a Trailer: Being Equipped for Safety" (DOT HS 809 433, April 2002; copy hosted by NY DMNA). https://dmna.ny.gov/nynm/training/NHTSA_TowingSafety.pdf. Accessed October 3, 2026.
FAQ
Is 12% tongue weight enough for a travel trailer?
12% is this calculator's midpoint of CURT's 10–15% band, not a separate standard and not a minimum. What matters is being inside the band with the trailer loaded for travel. Moving cargo changes the percentage, so measure after you pack.
Does a weight distribution hitch change tongue weight?
NHTSA says a weight-distribution hitch transfers weight to the front axle. This page does not claim that transfer leaves the measured tongue-weight percentage unchanged. CURT's two-pass vehicle-scale method, trailer wheels off the scale, is the tongue measurement. One CAT Scale pass with the trailer on its own platform is not that measurement.
Why does trailer sway show up as speed increases?
NHTSA says sway is more likely as speed increases, and that too little tongue weight is a cause. Under 10%, this calculator calls the tongue too light. Measure the loaded tongue weight, shift cargo forward into the 10–15% band, and use the manual trailer-brake controller rather than the tow-vehicle brakes if the trailer is already swaying. The worked point under the floor is on trailer sway.
Related: tongue weight guide, tow ratings explained, trailer sway, and how to weigh a truck and trailer.