Vehicle Center of Gravity Calculator

The center of gravity (CG) is the point where all of a vehicle's weight is concentrated. A lower CG improves stability, handling, and reduces rollover risk, while a higher CG makes the vehicle more prone to tipping during turns or on slopes.

This method using weight distribution measurements is quite accurate for practical purposes. It's the same technique used by race teams and automotive engineers, typically achieving accuracy within 1-2 inches of the actual CG height.

Lifting the rear creates a known angle that changes the weight distribution on the front and rear axles. This weight shift, combined with the geometry, allows us to calculate the vertical position of the center of gravity using physics principles.

You need vehicle scales or wheel scales to measure axle weights, a method to lift the rear axle to a known height (jack and blocks), and basic measuring tools for wheelbase and tire dimensions.

Adding weight raises the center of gravity, with the effect depending on where the weight is added. Roof-mounted equipment has the greatest impact, while low-mounted items like skid plates have minimal effect on CG height.

Most passenger vehicles have rollover angles between 25-35 degrees. Off-road vehicles typically range from 20-30 degrees. Higher angles indicate better stability, but factors like speed, terrain, and driver technique also affect rollover risk.

This calculator is designed for four-wheeled vehicles with front and rear axles. For motorcycles, boats, or aircraft, different measurement techniques and formulas are required due to their unique geometry and weight distribution.

Tire radius is used to determine the exact height of the axle centerline above ground. Larger tires raise the entire vehicle, including the CG, while the tire radius helps establish the reference point for accurate height measurements.