Enter the towing capacity of the vehicle and the weight of the trailer into the calculator to determine the trailer gain as a percentage of the towing capacity.

Trailer Gain Formula

The following formula is used to calculate the trailer gain percentage.

G = (TW / TC) * 100

Variables:

  • G is the trailer gain (%)
  • TW is the trailer weight (lbs)
  • TC is the towing capacity of the vehicle (lbs)

To calculate the trailer gain, divide the trailer weight by the towing capacity of the vehicle and then multiply by 100 to get the percentage.

What is Trailer Gain?

Trailer gain is a measure of how much of a vehicle’s towing capacity is being used by the trailer weight. It is expressed as a percentage and is important for ensuring that a vehicle is not overloaded, which can affect handling, braking, and overall safety. Understanding trailer gain helps in selecting the appropriate vehicle for towing and in maintaining safe towing practices.

How to Calculate Trailer Gain?

The following steps outline how to calculate the Trailer Gain.


  1. First, determine the towing capacity of the vehicle (TC) in pounds.
  2. Next, determine the trailer weight (TW) in pounds.
  3. Next, gather the formula from above = G = (TW / TC) * 100.
  4. Finally, calculate the Trailer Gain (G) as a percentage.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

towing capacity of the vehicle (TC) = 5000 lbs

trailer weight (TW) = 3000 lbs