How Much Does My Trailer Weigh: The Method, a Worked Example and the Limits

If you want a straight answer on how much does my trailer weigh, start with the method, not a single number. Towing capacity is the lowest of three ratings — the vehicle's tow rating, the tow-bar rating and the trailer's ATM — and it is capped again by GVWR, GCWR and payload. This page shows the method step by step, runs a worked example with clearly labelled example figures, and gives you tables you can use with your own ratings.

Never exceed your vehicle's GVWR, GCWR or payload. Check the owner's manual and the door-jamb sticker for the ratings that apply to your exact vehicle, and treat every figure on this page as a worked example unless it comes from your own vehicle's plates.

how much does my trailer weigh: The method: the lowest of three ratings

On this page, how much does my trailer weigh is the case in point: Towing capacity is the lowest of three numbers: the vehicle's tow rating, the tow-bar rating and the trailer's ATM (aggregate trailer mass — the maximum the trailer itself is rated to weigh when loaded). If any one of them is lower than the others, that one is the limit. In this page's worked example the three ratings are 7,500 lbs for the vehicle, 7,500 lbs for the tow bar and 6,500 lbs for the trailer ATM, so the towing capacity is 6,500 lbs — the lowest of the three. Those are example figures, not ratings for any particular vehicle: substitute the three numbers from your own owner's manual, tow-bar plate and trailer plate and the same step gives your answer. The reason the rule exists is that each rating protects a different part of the combination — the vehicle's engine, transmission, brakes and cooling; the tow bar and its mounting; and the trailer's axles, tyres and brakes — and the weakest of the three decides what is safe to pull.

There is a second layer of limits behind the tow rating. The loaded vehicle may not exceed its GVWR, the vehicle-plus-trailer combination may not exceed its GCWR, and the payload — the gap between kerb weight and GVWR — has to cover passengers, cargo and the tongue weight of the trailer. That last point is the one people miss: the hitch load is carried by the vehicle, so a heavy trailer shrinks the payload left for everything else. Pass the tow-rating check and still fail GCWR or payload, and the combination is overloaded. Check all three against the figures for your exact vehicle in the manual and on the door-jamb sticker.

Where to find your ratings for how much does my trailer weigh

Four plates and documents carry the whole answer. The owner's manual lists tow ratings by engine, axle ratio and configuration and states GVWR and GCWR. The driver's door-jamb sticker gives the GVWR and payload for your exact vehicle as built. The tow-bar rating plate sits on the bar or by the receiver. The trailer's compliance plate shows its ATM and tare weight. Read all four, and if two sources disagree, use the lower figure and ask a dealer to confirm for your VIN. Ratings shift with engine, axle ratio, cab, bed length and tow package, so a figure for a different configuration — or one copied from a forum — is not a substitute.

Worked example: the three ratings and the payload check for how much does my trailer weigh

Take a 4,500 lbs loaded trailer as the example. The vehicle's tow rating is 7,500 lbs, the tow-bar rating is 7,500 lbs and the trailer ATM is 6,500 lbs. The towing capacity is the lowest of the three: 6,500 lbs. The trailer's tongue weight at 10 to 15 percent is 450 to 675 lbs, and the middle of that range — about 562 lbs — is a good target. With an example payload of 1,800 lbs, the tongue weight leaves 1,238 lbs for passengers and cargo. If the passengers and luggage weigh more than that, the combination is overloaded even though the trailer is inside the tow rating, and something has to come off — either the trailer load or the vehicle load. That is the whole check in one paragraph: lowest of three, then tongue weight, then payload, then GCWR. Do it with your own numbers before every trip, because the answer changes every time the load changes.

how much does my trailer weigh: Tongue weight table

Use the table to read off the tongue-weight range for your loaded trailer weight. The middle column, 12.5 percent, is a handy loading target. Every figure is worked out from the trailer weight, so weigh the loaded trailer rather than guessing it. That is the point this page works through for how much does my trailer weigh.

Loaded trailer weight (lbs) 10% tongue weight 12.5% tongue weight 15% tongue weight
3,500 350 438 525
5,000 500 625 750
6,000 600 750 900
7,000 700 875 1,050
10,000 1,000 1,250 1,500

The four checks, in order for how much does my trailer weigh

Check What to compare Passes when
Tow rating Trailer weight vs lowest of vehicle, tow-bar and trailer ATM ratings Trailer weight is at or below the lowest rating
Tongue weight Tongue weight vs 10–15% of trailer weight Inside the range
Payload Tongue weight + passengers + cargo vs payload Total is at or below payload
GCWR Vehicle + trailer loaded weights vs GCWR Combined weight is at or below GCWR

how much does my trailer weigh: Common mistakes

  • Skipping the brake check on the trailer. A trailer's brakes need testing before every trip, not just at service time — a seized or disconnected trailer brake puts the whole stopping job on the tow vehicle. That is the point this page works through for how much does my trailer weigh.
  • Hitching up without checking the coupler is locked. A coupler that looks seated but is not latched can come off on the first bump, and the safety chains are a last resort, not a towing method. That is the point this page works through for how much does my trailer weigh.
  • On this page, how much does my trailer weigh is the case in point: Guessing the trailer's weight instead of weighing it. Bathroom scales and guesswork are not a substitute for a weighbridge or a proper scale, and an overloaded trailer is the most common cause of towing trouble.
  • Taking the highest rating and ignoring the other two. The vehicle rating, the tow-bar rating and the trailer ATM are all limits, and the lowest one decides — a strong vehicle with a light tow bar is limited by the tow bar. That is the point this page works through for how much does my trailer weigh.

Related calculations for how much does my trailer weigh

For how much does my trailer weigh, the point is this: These pages continue from here: the same method on a neighbouring question, or the calculator that runs the arithmetic for you.

Putting your figure to work for how much does my trailer weigh

On this page, how much does my trailer weigh is the case in point: Use the method as a pre-trip routine. Before you hitch up, weigh the loaded trailer, confirm the three ratings from your own documents, calculate the tongue weight and check it against payload and GCWR. Note the four results and keep them with the trailer's documents. Any change in load — water, luggage, passengers, a different trailer — means a fresh check, because the numbers move with the load. Done every trip, the routine takes minutes and keeps the combination inside its limits where it matters: on the road.

Frequently asked questions

How do I work out my towing capacity?

Take the lowest of three ratings: your vehicle's tow rating, your tow-bar rating and the trailer's ATM. Then check the tongue weight is 10 to 15 percent of the trailer weight, and check the combination against GVWR, GCWR and payload. All four checks have to pass. The ratings come from your owner's manual, the door-jamb sticker, the tow-bar plate and the trailer plate — not from a figure quoted for a different vehicle.

What is tongue weight and why does it matter?

On this page, how much does my trailer weigh is the case in point: Tongue weight is the downward force the trailer puts on the hitch. It should be 10 to 15 percent of the trailer's loaded weight — for a 4,500 lbs trailer that is 450 to 675 lbs. Too little causes sway; too much overloads the tow vehicle's rear suspension and lightens the steering. Load the trailer to get the percentage right, then re-weigh.

Can I exceed my towing capacity?

Taking how much does my trailer weigh as the case in point: No. The tow rating is a maximum set by the manufacturer for the vehicle's engine, transmission, brakes and cooling, and exceeding it increases braking distances, overheats the transmission, reduces stability and can be illegal. It can also void warranty coverage and give an insurer a reason to refuse a claim. If the trailer is heavier than the lowest of the three ratings, you need a different vehicle, a different tow bar or a lighter load.

Where do I find my vehicle's tow rating?

For how much does my trailer weigh, the point is this: In the owner's manual, listed by engine, axle ratio and configuration, and on the door-jamb sticker and VIN plate for your exact vehicle. The tow bar has its own rating plate, and the trailer has a compliance plate showing its ATM. If the manual and the sticker disagree, use the lower figure and ask a dealer to confirm for your VIN.

Why does my trailer sway?

For how much does my trailer weigh, the point is this: Sway usually means the tongue weight is too low, the load is tail-heavy, or the speed is too high for the combination. Slow down smoothly without braking hard, and check the loading before the next trip — moving weight forward of the trailer axle is the usual fix.