Trailer Tongue Weight Calculator
Calculate safe tongue weight from total trailer weight.
Returns the safe 10-15% range and checks against your vehicle's hitch and tow rating limits.
Trailer towing involves four critical weight ratings that every driver must understand before hitching up. Exceeding any one of them — even if the others are fine — creates a dangerous situation that can lead to loss of control, brake failure, or structural damage to your vehicle.
The four key ratings:
Tongue Weight = Total Trailer Weight × 10% to 15%
Gross Combined Weight Rating (GCWR) = Tow Vehicle Weight + Trailer Weight + Passengers + Cargo
Payload Capacity = GVWR − Curb Weight (of tow vehicle)
Available Tongue Weight = Payload Capacity − Passengers − Cargo
Variable definitions:
- GVWR (Gross Vehicle Weight Rating) — maximum total weight your vehicle can carry, including itself
- GCWR (Gross Combined Weight Rating) — maximum combined weight of vehicle plus trailer
- GTW (Gross Trailer Weight) — the actual fully loaded weight of your trailer
- Tongue Weight — the downward force the trailer hitch applies to the tow vehicle’s ball mount
- Curb Weight — vehicle weight with standard fluids, no passengers or cargo
Worked example: A pickup truck has a 10,000 lb tow rating and a 1,800 lb payload capacity. You load 300 lbs of passengers and 200 lbs of cargo = 500 lbs used. Available tongue weight = 1,800 − 500 = 1,300 lbs
If your trailer weighs 8,000 lbs, recommended tongue weight = 8,000 × 12% = 960 lbs — within safe limits.
Tongue weight guidelines:
| Trailer Type | Tongue Weight |
|---|---|
| Conventional trailer | 10–15% of GTW |
| Fifth-wheel trailer | 15–25% of GTW |
| Gooseneck trailer | 25–30% of GTW |
Warning signs of improper tongue weight:
- Too low (<10%): Trailer fishtails, bounces, or sways at highway speeds
- Too high (>15%): Rear of tow vehicle sags, headlights angle upward, steering becomes vague
Weight distribution hitches are designed for trailers with tongue weight above 10–15% of tow vehicle payload. They redistribute the load forward across all axles, restoring steering and braking performance. Required by most manufacturers for trailers over 5,000 lbs.