Trailer Tongue Weight Calculator

The decision behind the numbers

Calculate target tongue weight and approximate vehicle payload impact — the calculation isolates one capacity question while other limits remain independent.

Appropriate tongue percentage depends on trailer type and manufacturer guidance — that condition defines when target tongue weight is comparable with another result.

For a second calculation that will compare projected loaded vehicle weight with GVWR, use the GVWR Safety Margin.

Sources for the entered values

The Loaded trailer weight entry represents trailer weight in travel condition — before calculating, use the same loaded condition for every weight and retain the scale ticket or rating source.

Target tongue percentage: Desired vertical hitch-load share — a compatible entry should keep the percentage basis explicit and do not mix a decimal fraction with a percent value.

For Hitch hardware on vehicle, use the quantity described as hitch equipment that also consumes vehicle payload — in the vehicle record, use the same loaded condition for every weight and retain the scale ticket or rating source.

Boundaries of the result

This number does not replace independent checks of axle, tire, hitch, roof, component, or manufacturer limits that apply to the loaded vehicle — for hitch hardware on vehicle, the page specifically expects hitch equipment that also consumes vehicle payload.

From measurements to output

In “tongue weight = loaded trailer weight × tongue-weight percentage,” the printed units define how each term is interpreted.

No term beyond loaded trailer weight, target tongue percentage, and hitch hardware on vehicle is introduced in “tongue weight = loaded trailer weight × tongue-weight percentage.”

From output to vehicle decision

Target tongue weight answers “Calculate target tongue weight and approximate vehicle payload impact.” The additional displays, Vehicle payload impact and Trailer axle share, are a different view of the same entered measurements.

Measure the loaded trailer rather than relying only on target arithmetic — when that condition changes, compare separate calculator runs instead of blending the inputs.

Because appropriate tongue percentage depends on trailer type and manufacturer guidance, a disagreement between target tongue weight and an outside reference should trigger a review of loaded trailer weight and hitch hardware on vehicle.

If your notes raise the question of how to calculate ramp length for a selected loading height and maximum incline angle, move to the Loading Ramp Length without changing this page's inputs.

Measurement workflow

Load the vehicle or trailer to the condition being evaluated before collecting weights, dimensions, or ratings — this workflow must also account for the fact that appropriate tongue percentage depends on trailer type and manufacturer guidance.

• Record Loaded trailer weight as trailer weight in travel condition — use the same loaded condition for every weight and retain the scale ticket or rating source.
• Record Target tongue percentage as desired vertical hitch-load share — keep the percentage basis explicit and do not mix a decimal fraction with a percent value.
• Record Hitch hardware on vehicle as hitch equipment that also consumes vehicle payload — use the same loaded condition for every weight and retain the scale ticket or rating source.
• Repeat the check only after accounting for this condition: appropriate tongue percentage depends on trailer type and manufacturer guidance.

The current equation stops before the step needed to produce an arithmetic starting reference for a proportional brake-controller test, which is handled by the Trailer Brake Gain Starting.

Common issues with this calculation