Available Towing Capacity Calculator
Towing = GCWR − vehicle weight − passengers − payload. Stay 80% of max for safety.
Result
Max trailer weight
6,786 lb
Safe (80%): 5,429 lb. Tongue 12%.
- GCWR14000 lb
- Curb weight5800 lb
- Passengers + cargo600 lb
- Available for tow7,600 lb
- Tongue weight %12%
- Max trailer (loaded)6,786 lb
- Safe (80%)5,429 lb
Step-by-step
- Available = GCWR − curb − pax = 14000 − 5800 − 600 = 7,600 lb.
- Trailer + tongue = available; tongue = trailer × 0.12; → trailer = available / (1 + tongue) = 6,786 lb.
- Stay ≤ 80% (5,429 lb) for braking, hill climbs, headwinds.
How to use this calculator
- Find GCWR from owner manual.
- Weigh actual passengers + cargo.
- Set tongue %.
About this calculator
Manufacturer-rated tow capacity assumes near-empty cabin and zero cargo. Real-world tow = GCWR (gross combined weight rating) minus actual loaded vehicle weight. Tongue weight (10-15% conventional, 20-25% 5th-wheel) is supported by the vehicle so it counts against payload. Always tow 80% of computed max — leaves margin for grades, headwinds, and emergency stopping.
Frequently asked
GCWR = max combined truck + trailer + everyone in them. Tow rating = max trailer alone (with empty cabin). GCWR more conservative.
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