Trailer Tongue Weight Calculator
Calculate the tongue weight your trailer places on your hitch from its total loaded weight. Use this before towing to ensure you stay within your vehicle's hitch and tow ratings.
About this calculator
Tongue weight is the downward force that the front of a trailer exerts on the tow vehicle's hitch ball. It is expressed as a percentage of the trailer's total gross weight. The formula is: Tongue Weight (lbs) = Total Trailer Weight × (Tongue Percentage / 100). Industry standards recommend tongue weight be 10–15% of the total trailer weight for safe, stable towing. Too little tongue weight causes trailer sway, while too much overloads the hitch and rear axle of the tow vehicle. Both conditions are dangerous, so cargo placement inside the trailer — more weight forward of the axle — is the primary way to adjust tongue weight after loading.
How to use
Suppose your fully loaded trailer weighs 6,000 lbs and you want to verify a 12% tongue weight. Calculate: Tongue Weight = 6,000 × (12 / 100) = 6,000 × 0.12 = 720 lbs. Check this against your vehicle's hitch rating and rear gross axle weight rating (GAWR) — both must exceed 720 lbs. If your tongue weight comes in at only 8% (480 lbs), you should move cargo forward of the trailer axle to increase it toward the 10–15% target and reduce sway risk.
Frequently asked questions
What is the recommended tongue weight percentage for safe trailer towing?
Most towing experts and vehicle manufacturers recommend a tongue weight of 10–15% of the total loaded trailer weight for conventional trailers. For example, a 5,000-lb trailer should have a tongue weight between 500 and 750 lbs. Fifth-wheel and gooseneck trailers use higher percentages — typically 15–25% — because the hitch point is over the rear axle, distributing load differently. Always cross-reference the recommended percentage with your vehicle's published tongue weight capacity and hitch class rating.
How does too little or too much tongue weight affect towing safety?
Insufficient tongue weight shifts the trailer's center of gravity behind the axle, making the rear of the tow vehicle light and prone to fishtailing or trailer sway — a leading cause of towing accidents. Excessive tongue weight overloads the vehicle's rear suspension and hitch receiver, reducing front wheel traction and steering control. Both extremes increase stopping distances and reduce stability, especially in crosswinds or emergency maneuvers. Proper tongue weight keeps the tow vehicle level and the trailer tracking straight behind it.
How do I measure and adjust tongue weight on a loaded trailer?
The most accurate method is a dedicated tongue weight scale placed under the coupler at hitch height, or a bathroom scale with a board and lever arm setup for a DIY measurement. Alternatively, weigh your tow vehicle at a truck scale before and after hitching the loaded trailer — the difference is your tongue weight. To increase tongue weight, move heavy cargo forward of the trailer axle; to decrease it, shift cargo rearward. Always recheck tongue weight after any significant change in cargo position or total load.