Tongue Weight Calculator
Tongue weight is the downward force a loaded trailer places on the tow vehicle's hitch, and getting it right is one of the most important safety factors when towing. This calculator takes the fully loaded trailer weight and a tongue weight percentage and returns the recommended tongue weight, along with the standard 10 to 15 percent range that conventional bumper-pull trailers should fall within. The method is simply tongue weight equals trailer weight multiplied by the chosen percentage. You enter the loaded trailer weight in pounds and a target percentage, with a default of 12.5 percent, the midpoint of the usual range, and the tool returns the recommended tongue weight together with the low and high bounds. Every figure is computed deterministically from the formula shown below, never estimated, so the worked example reconciles exactly with the result on screen. Too little tongue weight lets a trailer sway dangerously at speed, while too much overloads the rear of the tow vehicle and degrades steering and braking. You adjust tongue weight by shifting cargo, moving load forward of the axle to increase it and rearward to reduce it. Fifth-wheel and gooseneck trailers use a higher range. Always respect your vehicle's, hitch's and trailer's rated limits.
Tongue weight is loaded trailer weight x tongue weight percentage, normally 10 to 15 percent. For a 5,000 lb trailer at 12.5%, the recommended tongue weight is 625.00 lb (a range of 500 to 750 lb).
Tongue weight formula
tongue weight = trailer weight x ( percentage / 100 )
trailer weight = fully loaded trailer weight in pounds
percentage = target tongue weight share (10 to 15 typical)
low / high = 10% and 15% of trailer weight
Multiplying the loaded trailer weight by the tongue weight percentage gives the target downward force at the hitch. The 10 and 15 percent bounds mark the recommended range for a conventional bumper-pull trailer.
Worked example
A trailer loaded to 5,000 lb with a target of 12.5 percent.
- Low end = 5,000 x 0.10 = 500 lb
- High end = 5,000 x 0.15 = 750 lb
- Recommended = 5,000 x 0.125 = 625.00 lb
The recommended tongue weight is 625.00 lb, within the 500 to 750 lb range. These are the calculator's default inputs, so the result above matches the widget exactly.
Tongue weight: frequently asked questions
What is trailer tongue weight?
Tongue weight is the downward force the trailer's coupler places on the tow vehicle's hitch ball. It is part of the loaded trailer's total weight, transferred at the hitch. Correct tongue weight keeps the trailer stable, while too little or too much can cause dangerous sway or poor handling.
What percentage should tongue weight be?
For a conventional bumper-pull trailer, tongue weight should generally be 10 to 15 percent of the fully loaded trailer weight. A common target is around 12.5 percent, the midpoint. Fifth-wheel and gooseneck trailers use a higher range, usually 15 to 25 percent, because of how they connect.
Why does tongue weight matter for safety?
Too little tongue weight lets the trailer sway from side to side, which can become uncontrollable at speed. Too much overloads the rear of the tow vehicle, lightening the front and reducing steering and braking control. Staying within the recommended percentage keeps the combination balanced.
How do I adjust tongue weight?
Shift cargo within the trailer. Moving load forward of the axle increases tongue weight; moving it rearward decreases it. Aim to place about 60 percent of the load ahead of the axle. Re-check after loading, because the figure depends on how the trailer is packed, not just its empty design.
Does this replace the vehicle's rated limits?
No. Always stay within the tow vehicle's and hitch's rated capacities and the trailer's gross weight rating. This calculator gives a recommended tongue weight range from a percentage; it does not certify that your specific vehicle, hitch and trailer combination is rated for the load.
Official sources
- Towing safety and vehicle ratings reference: US National Highway Traffic Safety Administration (NHTSA). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.