Trailer Tongue Weight Calculator

Why Tongue Weight Matters

Tongue weight is the downward force your trailer's coupler puts on your tow vehicle's hitch ball — not the trailer's total weight, just the portion pressing down at the connection point. Get it wrong in either direction and towing gets genuinely unsafe, not just uncomfortable. Too little tongue weight (under 10% of the trailer's gross weight) leaves the back of the trailer too light relative to its own mass, and it starts to sway — fishtailing that gets worse at highway speed and in crosswinds or from passing trucks. Too much (over 15%) does the opposite: it pushes down hard enough on the rear of the tow vehicle to lift weight off the front axle, softening steering response and aiming headlights upward, on top of potentially exceeding your hitch's or vehicle's rated tongue weight capacity.

How to Use This Calculator

Enter your trailer's gross weight — the trailer itself plus everything loaded inside it, not just the empty weight from the manufacturer's spec plate. If you already know your actual tongue weight (from a bathroom scale under the coupler, a dedicated tongue weight scale, or your loaded numbers off a CAT scale), enter it too and the calculator will tell you whether it falls inside the safe zone.

How We Calculate It

The recommended range is 10% to 15% of Gross Trailer Weight (GTW), the standard used across the towing industry and hitch manufacturers. A 5,000 lb loaded trailer should have a tongue weight between 500 and 750 lb. If you provide your actual tongue weight, we express it as a percentage of your GTW and flag whether it falls below, within, or above that range.

A Few Notes

This rule of thumb applies to conventional bumper-pull trailers; fifth-wheel and gooseneck trailers carry a much higher share of their weight on the hitch (typically 15-25%) because of the different connection point, so don't apply this range to those. Tongue weight also isn't fixed by the trailer's design alone — how you load cargo shifts it: weight forward of the axle adds tongue weight, weight behind it subtracts. If your measured weight is off, redistributing cargo is usually the fix before assuming something's wrong with the trailer itself.