Car Center of Mass Calculator
Calculate the center of gravity position for your car in three dimensions
Car Weight
Total weight of the car including fuel and passengers
Longitudinal Position
Distance between front and rear axles
Weight measured on front wheels
Weight measured on rear wheels
Altitudinal Position
Side Position
Distance between left and right wheels
Combined weight of left wheels
Combined weight of right wheels
Measurement Steps
Longitudinal
Weigh front and rear axles on level ground
Altitudinal
Raise one axle and measure weight change
Lateral
Weigh left and right wheels separately
Safety Tips
Always use wheel chocks and parking brake
Ensure all measurements are on level surfaces
Remove or account for passengers and cargo
Check tire pressures before measurements
Understanding Car Center of Mass
What is Center of Mass?
The center of mass (or center of gravity) is a unique point where the car behaves as if all its mass were concentrated. This point determines how the vehicle responds to forces and affects its handling characteristics.
Three-Dimensional Position
- •Longitudinal: Forward/backward position along wheelbase
- •Altitudinal: Height above ground level
- •Lateral: Left/right position across track width
Physics Principles
Torque Equilibrium
For longitudinal position:
a = L × (Fb / Fg)
b = L × (Fa / Fg)
Height Calculation
Using raised wheel method:
h = (ΔF/Fg) × L × cot(θ) + r
Lateral Position
Side-to-side balance:
x = T × (FR / Fg)
y = T × (FL / Fg)
Importance of Center of Gravity
Vehicle Handling
Center of mass position affects how the car responds to steering inputs, braking, and acceleration. Proper balance is crucial for safe and predictable handling.
Load Transfer
During cornering, braking, and acceleration, weight transfers between wheels. The center of mass position determines how much load transfer occurs.
Stability
A lower center of gravity improves stability and reduces the risk of rollover. This is why race cars are designed to be as low as possible.