Calculator 03 / Towing & Payload
Towing & Payload Calculator
Payload and towing are limited by different ratings, and the trailer you can pull is capped by whichever rating runs out first. Check remaining payload and towing capacity against your vehicle's ratings, or get a recommended trailer tongue/pin weight.
How this calculator works
Units below default automatically — Metric for non-English pages (or if your device's language is set to one we support), US customary otherwise — and convert automatically if you switch the toggle above the form. Changing language resets to that language's default unless you toggle again.
Payload capacity is everything added to the vehicle itself — passengers, cargo, and (for a bumper-pull setup) tongue weight all count against it, which is why overloaded tow vehicles are a common problem even when the trailer itself is within its own rating. Tongue/pin weight percentages are standard trailering guidelines: too little and the trailer can sway at speed; too much and it overloads the tow vehicle's rear axle and hitch.
Worked example: the limit that is not the one on the brochure
A truck rated GVWR 9,900 lb, curb 7,200 lb, with 600 lb of people and gear already aboard, and a GCWR of 22,000 lb:
- Total payload = 9,900 − 7,200 = 2,700 lb
- Payload still available = 2,700 − 600 = 2,100 lb
- Max trailer by GCWR = 22,000 − 7,200 − 600 = 14,200 lb
- A conventional hitch takes up to 15% on the ball: 2,100 ÷ 0.15 = 14,000 lb
- Governing limit = the lower of the two = 14,000 lb
Now hitch a gooseneck instead, which puts up to 25% on the truck: 2,100 ÷ 0.25 = 8,400 lb. The same truck, the same GCWR, and the honest towing limit has fallen by 5,800 lb — because hitch weight is payload, and this truck ran out of payload long before it ran out of GCWR.
Every rating applies at once, and the lowest wins
There is no single "towing capacity". There is a set of limits, all in force simultaneously, and a combination is legal only when it satisfies every one of them. Exceeding any is a safety failure, not a paperwork problem.
| Rating | What it caps | Where it is printed |
|---|---|---|
| GVWR | The loaded tow vehicle on its own, including hitch weight | Door-jamb sticker |
| GCWR | Tow vehicle and trailer together, fully loaded | Manufacturer's towing guide |
| GAWR front / rear | Each axle individually — hitch weight loads the rear hard | Door-jamb sticker |
| Payload | People, cargo and hitch weight together | Yellow payload sticker, vehicle-specific |
| Hitch / receiver rating | Tongue weight and gross trailer weight at the hitch | Label on the receiver itself |
| Tire load rating | What each tire may carry at its rated pressure | Tire sidewall and the placard |
| Trailer GVWR | The trailer and its own load | Trailer VIN plate |
The payload sticker is the one to find. It is specific to the vehicle as built — trim, cab, axle ratio, sunroof and every factory option come out of it — so the brochure figure for the model is almost always higher than the figure for the truck on your drive. A weight-distributing hitch changes how load is shared between the axles; it does not raise GVWR, GCWR or payload by a single pound.
Hitch weight by trailer type
The share of trailer weight that lands on the tow vehicle is what turns a towing question into a payload question. Too little and the trailer sways; too much and the truck runs out of payload and rear axle capacity.
| Type | Share of trailer weight | Sits | Failure mode if too light |
|---|---|---|---|
| Conventional / bumper-pull | 10–15% | Behind the rear axle, on the ball | Sway that worsens with speed |
| Gooseneck | 15–25% | Over the rear axle, in the bed | Instability and poor traction |
| Fifth wheel | 15–25% | Over or ahead of the rear axle | Instability and poor traction |
A conventional hitch sits behind the rear axle, so it works as a lever: it adds weight to the rear axle and takes weight off the front, which is what makes steering feel light on an overloaded bumper-pull. A gooseneck or fifth wheel places the load over the axle instead, which is why they carry a higher share safely.
Where the payload runs out
Using the worked example's 2,100 lb of remaining payload. The GCWR ceiling for this truck is 14,200 lb of trailer, so every row below is inside GCWR — and yet most of them are not legal.
| Trailer weight | Hitch at 10% | at 15% | at 25% | Against 2,100 lb |
|---|---|---|---|---|
| 5,000 lb | 500 | 750 | 1,250 | Fine on any hitch |
| 7,000 lb | 700 | 1,050 | 1,750 | Fine on any hitch |
| 9,000 lb | 900 | 1,350 | 2,250 | Gooseneck already over |
| 11,000 lb | 1,100 | 1,650 | 2,750 | Gooseneck well over |
| 14,000 lb | 1,400 | 2,100 | 3,500 | Conventional exactly at the limit |
Read the bottom row carefully. At 14,000 lb the trailer is 200 lb inside GCWR and the tongue weight has consumed the entire remaining payload — meaning no passengers, no tools, no fuel beyond what was already counted. This is the case the GCWR figure alone hides, and it is why the calculator now shows both limits and names which one governs.
Where this goes wrong
- Using the brochure's "max towing" figure. It describes a stripped configuration with a driver and nothing else. Your truck's payload sticker is the real number.
- Forgetting hitch weight is payload. It is the single most common towing mistake, and the reason a truck can be inside GCWR and over GVWR at the same time.
- Entering dry trailer weight. Use loaded weight. Water, propane, batteries, gear and the trailer's own options can add a thousand pounds or more to a listed dry figure.
- Assuming a weight-distributing hitch adds capacity. It redistributes load between axles. It changes no rating.
- Ignoring the front axle. A conventional hitch levers weight off the steer axle. Light steering under tow is not a feel problem, it is a load-distribution warning.
- Checking gross and not axles. A combination can be under GVWR and over the rear GAWR, and the rear axle is exactly where hitch weight lands.
- Trusting any of this over a scale. Weigh the loaded combination. Every figure here is arithmetic on numbers you typed in.
Where these numbers come from
Ratings come from the manufacturer's plate and legal limits come from federal and state law, and the lower of the two always governs. Neither is something a calculator can override.
- 23 CFR Part 658 — Truck Size and Weight — Federal gross, axle and bridge-formula limits on the Interstate System.
- FHWA Freight Size and Weight Program — How the federal limits, the bridge formula and state exceptions actually interact.
- 49 CFR 393.102 — Cargo securement performance — The minimum restraint a load must have before any of these weights matter.
Why is GCWR different from just adding GVWR + trailer weight?
GCWR (Gross Combined Weight Rating) is the manufacturer's tested limit for the tow vehicle and trailer combined — it accounts for how the drivetrain, brakes, and frame perform under combined load, and is often lower than simply adding the two individual ratings together.
My tongue weight calculation seems high — what if I'm over?
Redistribution hitches can shift some tongue weight back onto the trailer's own axles, and repositioning cargo within the trailer (more weight over the axles, less far forward or back) can bring tongue weight into range without changing the trailer's total weight.
Estimates only. Always confirm your specific vehicle's GVWR, GCWR, and hitch ratings from the manufacturer — ratings vary by trim, axle, and hitch configuration.