How to calculate axle weights

How to calculate axle weights 780 325 Sorcha O'Grady

In this short article, we explain the formulae for calculating axle weights, and take you through a simple example.

Axle Weight Distribution Formulae

To calculate distribution of weight on the front and rear axles of a truck, use these simple formulae:WB Wheelbase W Total Weight Wf Weight on front axle Wr Weight on rear axle CGF Distance from Center of Gravity to front axle

Let’s take an example

  • Step 1: Determine the Wheelbase
    • You will find this on the vehicle specification sheet. In this example, let’s say the wheelbase of the vehicle is 208 in.
  • Step 2: Determine the weight and center of gravity of the body
    • Let’s say the total weight of the body is 5000 lb, and its center of gravity is 28.2 in from the rear axle.
    • Therefore, we can calculate the Center of Gravity from the front axle to be 208 in – 28.2 in = 179.8 in.
  • Step 3: Use the formula to calculate weight on the rear axle

  • The Weight on the Rear Axle is 5000 x 179.8/208 = 4322 lb.
  • Step 4: Subtract weight on rear from total weight to find weight on front

  • This leaves the remaining weight of 5000 lb – 4322 lb = 678 lb on the front axle.

Principles of Weight Distribution

In this example, we have calculated the distribution of weight of a service body over 2 axles of a 4×2 rigid truck. The principles of calculating weight distribution are the same for this configuration as for calculating distribution of payload on a truck tractor with one or more trailers.

Looking for an easier way?

We have kept it simple here for purposes of demonstration.  If you have a more complicated configuration, or would like to be able to use a graphical interface to calculate axle weight distribution of multiple components at once, please take 2 minutes to watch this video about our Axle Weight Calculator app, or grab a free trial here.

Not yet a user of our Axle Weight Calculator?

Watch this 2-minute video about the Axle Weight Calculator, find more detail about the Features of the program, or dive right in and try it for free below!

Watch a 2-minute intro to TruckScience

Next Webinar

We run regular webinars to help our users advance their understanding of what's involved in configuring safe, legal and efficient trucks. Register for our next webinar by clicking on this image:

Try TruckScience

Try TruckScience for free!

Try TruckScience for free!