Towing Capacity Helper
Work out how much trailer you can safely pull from your truck's real weight ratings — GCWR for the tow limit and GVWR for the payload that holds the tongue weight.
How much can my truck safely tow?
Take your GCWR and subtract the truck's curb weight plus people and cargo — that's the trailer weight the driveline can handle. Then check payload: your GVWR minus the same loaded weight must still cover the trailer's tongue weight (10–15%). The lower of the two is your real limit, and it's often payload, not the headline tow number.
Your numbers
Estimated max trailer weight
5,833.33
limited by payload / tongue weight
Available by GCWR
8,700
lb
Payload remaining
700
lb for tongue weight
Insight — Two limits cap towing: the GCWR (the whole rig's weight) and your payload (which has to carry the trailer's tongue weight plus people and cargo). Payload is the one people forget — a half-ton truck often runs out of payload long before its headline tow number. This is guidance only; never exceed the ratings on your door sticker and hitch.
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For context: a truck with a 15,000 lb GCWR carrying 5,600 lb of curb weight plus 700 lb of people and cargo has about 8,700 lb available by GCWR — but if only 700 lb of payload is left for a 12% tongue weight, the real limit is closer to 5,800 lb. Use your own door-sticker numbers above.
How this calculator works
This is an informational estimate, not a safety approval. The calculator applies the two ratings that actually cap towing. From GCWR it subtracts your loaded truck weight to get the trailer weight the powertrain and brakes are rated for. From GVWR it works out how much payload is left to carry tongue weight, then converts that to a trailer weight at your chosen tongue percentage. It reports the smaller of the two as the safe maximum and names which limit binds.
Formula
Loaded truck = curb + cargo. Tow by GCWR = GCWR − loaded truck. Payload left = GVWR − loaded truck. Tow by payload = payload left ÷ tongue%. Max trailer = min(tow by GCWR, tow by payload).
Worked example
GCWR 15,000; GVWR 7,000; curb 5,600; cargo 700; tongue 12%. Loaded truck = 6,300. Tow by GCWR = 8,700. Payload left = 700, so tow by payload = 700 ÷ 0.12 ≈ 5,830. Max trailer ≈ 5,830 lb, limited by payload.
What affects your result
- →GCWR and GVWR from the door sticker
- →Truck curb weight
- →Passengers and cargo carried in the truck
- →Trailer tongue-weight percentage (10–15%)
- →Hitch class and axle ratings (checked separately)
What this estimate includes
- ✓Trailer weight available by GCWR
- ✓Remaining payload for tongue weight
- ✓The binding limit (GCWR vs payload)
- ✓Suggested tongue weight at the max trailer
What it does not include
- ×Hitch, ball-mount and receiver class ratings
- ×Trailer-brake and sway-control requirements
- ×Rear-axle (RGAWR) and tire load limits
- ×Grade, altitude and local towing law
Good to know
Clear, practical answers about the towing capacity calculator.
What's the difference between GCWR, GVWR and towing capacity?＋
GVWR is the most your loaded truck alone may weigh. GCWR is the most the truck and trailer may weigh combined. Towing capacity is roughly GCWR minus your loaded truck weight — but payload (GVWR headroom) often limits you first because it must carry the trailer's tongue weight.
Why is payload often the real towing limit?＋
A trailer puts 10–15% of its weight down on the hitch as tongue weight, and that load counts against your truck's payload along with passengers and cargo. Many half-ton trucks hit their payload ceiling — and an overloaded rear axle — well before reaching the big tow number in the brochure.
Is this calculator a safety guarantee?＋
No. It's an informational estimate to help you understand the math. Real limits depend on your exact configuration, hitch class, axle ratings and local law. Always follow the tow and payload ratings on your vehicle's door sticker, owner's manual and hitch — never exceed the lowest applicable rating.
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