Towing Capacity Calculator — Max Trailer Weight & Payload

Calculate your max trailer weight, payload capacity, and recommended tongue weight from your vehicle's GCWR, GVWR, and curb weight.

July 10, 2026

GCWR — Gross Combined Weight Rating (lb)

Max weight of tow vehicle + trailer combined — door-jamb sticker or owner's manual

GVWR — Gross Vehicle Weight Rating (lb)

Max weight of the tow vehicle itself, fully loaded, no trailer

Curb Weight (lb)

Vehicle's own weight, empty of passengers/cargo (also on the door-jamb sticker)

Current Passengers/Cargo/Fuel (lb, optional)

Leave at 0 to estimate off curb weight alone; add this for a more precise number

Max Trailer Weight

11,800 lb

GCWR − loaded vehicle weight (5,200 lb)

Payload Capacity

1,800 lb

GVWR − curb weight — separate from towing

Planned Trailer Weight (lb, optional — for tongue weight)

Recommended tongue weight (conventional bumper-pull hitch): 800–1,200 lb (10–15% of the 8,000 lb trailer). Gooseneck, 5th-wheel, and weight-distribution hitches use different ratios — check your hitch manufacturer's spec.

Max Trailer Weight = GCWR − Loaded Vehicle Weight. Payload Capacity = GVWR − Curb Weight. Tongue weight guidance (10–15% of trailer weight) applies to conventional bumper-pull trailers only. GCWR, GVWR, and curb weight vary by trim, engine, drivetrain, and factory options — always use the numbers from your own vehicle's door-jamb sticker or owner's manual, not a generic make/model estimate.

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Reference Values

Last verified: Jul 9, 2026

Category	Range	What It Means	Status
Max Trailer Weight formula ★	GCWR − Loaded Vehicle Weight	Gross Combined Weight Rating (the manufacturer's max for tow vehicle + trailer combined, fully loaded) minus your tow vehicle's current loaded weight (curb weight plus passengers, cargo, and fuel). Using curb weight alone gives a simpler but slightly optimistic estimate.	★ Best
GVWR	Manufacturer-rated max, lb	Gross Vehicle Weight Rating — the maximum total weight of the tow vehicle itself (curb weight + everything you load into or onto it), found on the door-jamb sticker or in the owner's manual. This does not include a trailer.	Good
Payload Capacity formula	GVWR − Curb Weight	The maximum combined weight of passengers, cargo, and gear the tow vehicle itself can carry — separate from towing capacity. A loaded truck bed, cab full of passengers, and hitch-mounted accessories all eat into payload, not just what's in the bed.	Good
GCWR	Manufacturer-rated max, lb	Gross Combined Weight Rating — the maximum total weight of the tow vehicle AND trailer together, fully loaded. This is the ceiling that Max Trailer Weight is calculated from.	Good
Tongue weight (conventional bumper-pull) ★	10–15% of total trailer weight	The downward force the trailer's hitch coupler puts on the tow vehicle's hitch ball, for a standard bumper-pull travel trailer or utility trailer. Too little tongue weight causes dangerous trailer sway; too much overloads the rear axle.	★ Best
Tongue weight (gooseneck / 5th-wheel / weight-distribution)	Varies by hitch type — not a flat 10–15%	Gooseneck and 5th-wheel setups typically run higher (roughly 15–25% pin weight) and weight-distribution hitches redistribute load differently. These setups use different math than a conventional ball hitch — check your hitch manufacturer's specification rather than applying the bumper-pull percentage.	Okay

Source: CURT Manufacturing, 'How to Measure Towing Capacity, GVWR, and GCWR' (curtmfg.com); Reading Truck, 'Payload and Towing Capacity Unveiled' (readingtruck.com). Every real vehicle's exact GVWR, GCWR, and curb weight varies by trim, engine, cab configuration, axle ratio, and factory options — always confirm your specific vehicle's ratings from its door-jamb sticker or owner's manual rather than a generic make/model estimate.

Worked Examples

Half-Ton Pickup — Curb Weight Only

GCWR: 17,000 lb
GVWR: 7,000 lb
Curb Weight: 5,200 lb

11,800 lb max trailer weight, 1,800 lb payload capacity

Max Trailer Weight = 17,000 − 5,200 = 11,800 lb. Payload Capacity = 7,000 − 5,200 = 1,800 lb.

Same Truck, Loaded with Passengers and Cargo

GCWR: 17,000 lb
GVWR: 7,000 lb
Curb Weight: 5,200 lb
Current Passengers/Cargo: 600 lb

11,200 lb max trailer weight

Loaded Vehicle Weight = 5,200 + 600 = 5,800 lb. Max Trailer Weight = 17,000 − 5,800 = 11,200 lb — 600 lb less than the curb-weight-only estimate, showing why passengers and cargo matter for a precise number.

Heavy-Duty Truck with a Large Trailer

GCWR: 35,000 lb
GVWR: 10,000 lb
Curb Weight: 7,200 lb
Planned Trailer Weight: 20,000 lb

27,800 lb max trailer weight, 2,800 lb payload capacity, 2,000–3,000 lb recommended tongue weight

Max Trailer Weight = 35,000 − 7,200 = 27,800 lb. Payload Capacity = 10,000 − 7,200 = 2,800 lb. Tongue weight = 20,000 × 10% to 20,000 × 15% = 2,000–3,000 lb. The planned 20,000 lb trailer is well within the 27,800 lb ceiling.

Midsize SUV

GCWR: 13,000 lb
GVWR: 6,700 lb
Curb Weight: 4,900 lb
Planned Trailer Weight: 5,000 lb

8,100 lb max trailer weight, 1,800 lb payload capacity, 500–750 lb recommended tongue weight

Max Trailer Weight = 13,000 − 4,900 = 8,100 lb. Payload Capacity = 6,700 − 4,900 = 1,800 lb. Tongue weight = 5,000 × 10% to 5,000 × 15% = 500–750 lb.

Compact SUV Near Its Towing Limit

GCWR: 9,500 lb
GVWR: 5,600 lb
Curb Weight: 4,100 lb
Planned Trailer Weight: 5,300 lb

5,400 lb max trailer weight, 1,500 lb payload capacity, 530–795 lb recommended tongue weight — trailer is close to the limit

Max Trailer Weight = 9,500 − 4,100 = 5,400 lb. Payload Capacity = 5,600 − 4,100 = 1,500 lb. Tongue weight = 5,300 × 10% to 5,300 × 15% = 530–795 lb. The planned 5,300 lb trailer uses 98% of the 5,400 lb ceiling, leaving almost no margin for passengers, cargo, or fuel added afterward.

How to Use This Calculator

1

Find your vehicle's ratings

Locate GCWR, GVWR, and curb weight on your driver's-side door-jamb sticker or in your owner's manual.
2

Enter GCWR, GVWR, and curb weight

These three numbers are all the calculator needs for max trailer weight and payload capacity.
3

Add current passengers/cargo (optional)

For a precise max trailer weight, add what's currently loaded into the tow vehicle — otherwise the estimate uses curb weight alone.
4

Enter your planned trailer weight (optional)

Get a recommended tongue weight range and a warning if the trailer exceeds your calculated max.
5

Read your results

Max trailer weight, payload capacity, and tongue weight range all update instantly as you edit any field.

What Each Value Means

GCWR (lb): Gross Combined Weight Rating — the manufacturer's maximum allowed weight for the tow vehicle and trailer together, fully loaded. This is the ceiling that max trailer weight is calculated against.
GVWR (lb): Gross Vehicle Weight Rating — the manufacturer's maximum allowed weight for the tow vehicle alone, fully loaded with passengers and cargo, not including a trailer.
Payload Capacity (lb): The maximum weight of passengers, cargo, and gear the tow vehicle itself can carry, calculated as GVWR minus curb weight. Distinct from towing capacity.
Tongue Weight (lb): The downward force a trailer's coupler exerts on the tow vehicle's hitch ball. For conventional bumper-pull trailers, 10-15% of total trailer weight is the standard target.

Frequently Asked Questions

What's the difference between GVWR, GCWR, and payload capacity?

GVWR (Gross Vehicle Weight Rating) is the max weight of the tow vehicle itself, fully loaded, with no trailer attached. GCWR (Gross Combined Weight Rating) is the max weight of the tow vehicle and trailer together. Payload capacity is how much passengers, cargo, and gear the vehicle itself can carry (GVWR − curb weight), while max trailer weight is how much it can pull (GCWR − loaded vehicle weight). All four numbers are related but answer different questions — mixing them up is the most common towing math mistake.

How do I find my vehicle's GCWR, GVWR, and curb weight?

All three are usually printed on the driver's-side door-jamb sticker, alongside your tire pressure and load limits. If the sticker only lists GVWR and payload, check your owner's manual or the manufacturer's towing guide for GCWR — it's not always on the sticker itself. These numbers are specific to your exact trim, engine, cab size, and drivetrain, so never borrow a number from a different configuration of the 'same' truck.

Should I use curb weight or my vehicle's actual loaded weight to calculate max trailer weight?

Curb weight alone gives a simpler, slightly optimistic estimate since it ignores passengers, cargo, and a full tank of fuel. For a precise number, add your current passengers, cargo, and gear to curb weight first — every pound sitting in the cab or bed reduces how much trailer you can safely tow, because GCWR is a hard ceiling on the combined total, not just the trailer.

What percentage of trailer weight should sit on the hitch (tongue weight)?

For a conventional bumper-pull trailer, 10-15% of the total trailer weight resting on the hitch ball is the standard target. Too little tongue weight lets the trailer sway at highway speed; too much overloads the rear axle and can lighten the front tires' grip. Gooseneck, 5th-wheel, and weight-distribution-hitch setups follow different ratios and should be sized against the hitch manufacturer's own specification, not this bumper-pull guideline.

Can I tow right up to my max trailer weight?

Technically yes, but it leaves zero margin for error. Real-world factors — headwind, grade, trailer brake wear, extra cargo added later, even a full water tank on a camper — all add weight you may not have accounted for. Most experienced towers treat their calculated max as a hard ceiling and try to stay meaningfully under it, not as a target to hit exactly.