Vehicle Center of Gravity Calculator

A vehicle's center of gravity height determines how it handles corners, off-camber terrain, and rollover risk — but measuring it requires a specific two-weigh method most drivers have never tried. Enter your wheelbase, front and rear axle weights (level and with the rear raised), rear lift height, and front tire radius into the Vehicle Center of Gravity Calculator to find your CG height. Secondary outputs include total vehicle weight, front/rear weight distribution, and static rollover angle — with optional adjustments for added loads like roof racks, cargo, or skid plates.

Results

Center of Gravity Height

Total Vehicle Weight

Front Weight Distribution

Rear Weight Distribution

Static Rollover Angle

Results Table

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Frequently Asked Questions

What is the center of gravity and why is it important for vehicles?

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.

How accurate is this center of gravity calculation method?

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.

Why do I need to lift the rear of the vehicle for this calculation?

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.

What equipment do I need to measure my vehicle's center of gravity?

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.

How does adding weight or modifications affect the center of gravity?

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.

What is a safe rollover angle for my vehicle?

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.

Can I use this calculator for motorcycles or other vehicles?

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.

How does tire size affect the center of gravity calculation?

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.