Tow Calculators

Calculator

Fifth-Wheel Pin Weight Calculator

Estimate fifth-wheel pin load from your own percentage, or find the percentage of a known pin weight. Pin load also uses truck payload.

Check your pin load

Units: lb
Pin weight source

Use the same loaded condition as the percentage or entered pin weight.

Enter your own percentage; there is no universal default.

Enter 0 for loads you are not adding. Results stay in this page.

Results

Your focused comparison appears here.

Enter the values above, then select Calculate. An estimate will remain labeled as an estimate.

Include pin weight in your truck’s payload calculation.

Pin weight is load carried by the truck.

Pin weight is the vertical load transferred at a fifth wheel’s king pin and hitch. The whole trailer does not count as truck payload, but its pin load does. A brochure’s unloaded hitch-weight value can differ from the pin load of a trailer packed for a trip.

Formula and weight basis

Estimated pin weight = loaded fifth-wheel weight × (entered percentage ÷ 100)

Derived pin percentage = entered pin weight ÷ loaded fifth-wheel weight × 100

Estimate mode requires your own percentage. Known mode accepts entered pin weight and derives its percentage of the same loaded trailer weight. It labels the value Entered pin weight, because the tool cannot establish whether it was actually measured. There is no default pin percentage.

Worked example

A 12,000 lb loaded fifth wheel at an explicitly entered 20% produces an estimated 2,400 lb pin load. Entering a known 2,400 lb pin load for that same trailer also derives 20%. The percentage is an example, not a universal fifth-wheel recommendation.

Illustrative scenario, not a manufacturer specification or approval.

How to interpret the result

An estimated pin load is a planning value, not evidence of actual loading. Add pin load, hitch hardware, people and cargo to a truck’s payload analysis. Check GVWR, hitch, axle and tire ratings as well; a fifth-wheel tow rating alone does not establish compatibility.

Common mistakes

  • Treating 20% in an example as a universal requirement.
  • Using unloaded brochure pin weight for a loaded trailer.
  • Forgetting the fifth-wheel hitch hardware in truck payload.
  • Combining pin weight and trailer weight from different loading conditions.

Full Tow Calculator — compare the available vehicle, trailer and hitch limits together.

  • Payload CalculatorYou want to know how people, gear, and trailer hitch load use your vehicle’s rated payload.
Browse all towing calculators
Browse all towing guides

Frequently asked questions

What pin-weight percentage should I use?

Use guidance for the exact trailer and loading condition, or measure it. This tool accepts your explicit percentage; it does not prescribe one for all fifth wheels.

Does pin weight count toward truck payload?

Yes. Include it alongside people, truck cargo, accessories and hitch hardware. The payload tool can isolate that comparison.

Why show an entered pin percentage?

It describes the relationship between the two weights you entered. It does not certify their accuracy, trailer balance, or suitability for the truck.

Sources and scope

Primary guidance reviewed September 28, 2026. Manufacturer labels and the manuals for your exact equipment take precedence.