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Category Car Calculators

Wheelbase mm

Track Width mm

Front Left kg

Front Right kg

Rear Left kg

Rear Right kg

Presets:

Wheelbase mm

Track Width mm

Example:

Enter data and press Calculate

Total Mass — kg

Longitudinal CoM — mm from front axle

Lateral CoM — mm from centerline

Front : Rear — %

Left : Right — %

Cross Weight — %

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About

Miscalculating a vehicle's center of mass (CoM) directly degrades handling predictability, braking stability, and cornering grip balance. A longitudinal CoM shifted too far rearward causes oversteer under deceleration. A lateral offset as small as 15mm produces measurable tire wear asymmetry over 10,000km. This calculator computes CoM position using the weighted-average method from individual component masses and their coordinates, or from measured axle loads applied across the wheelbase L and track width T. Results assume a rigid body on a level surface. The tool does not account for suspension deflection under load transfer or fluid slosh in partially filled tanks.

Professional race teams use corner-weight scales accurate to ±0.5kg. If your input data comes from manufacturer specs rather than direct measurement, expect ±2-3% deviation from true values. For road cars, this tool provides sufficient accuracy for suspension tuning decisions, ballast placement, and cargo loading strategy. All distances reference the front-axle centerline as origin (x = 0) and the vehicle centerline (y = 0).

Formulas

The longitudinal center of mass position X_cm is computed from the front-axle origin using axle load proportions applied to the wheelbase:

X_cm = L × W_rW_f + W_r

Where L = wheelbase mm, W_f = total front axle load kg, W_r = total rear axle load kg. The result is the distance from the front axle centerline to the center of mass.

The lateral center of mass Y_cm uses left/right load distribution across the track width:

Y_cm = T2 × W_R − W_LW_R + W_L

Where T = track width mm, W_R = total right-side load, W_L = total left-side load. A result of 0 means perfect lateral centering.

For the component-based method with n discrete masses, the general 2D center of mass is:

X_cm = n∑i=1 m_i ⋅ x_in∑i=1 m_i

Where m_i = mass of component i kg, x_i = longitudinal position of component i from front axle mm. The same formula applies to the Y axis using lateral positions y_i.

Front weight distribution percentage:

%_front = W_fW_total × 100

Reference Data

Vehicle Type	Typical Wheelbase mm	Track Width mm	Curb Weight kg	Front:Rear %	CoM Height mm
Compact Hatchback (Golf)	2636	1540	1300	60:40	480
Mid-size Sedan (Camry)	2825	1580	1550	58:42	510
Sports Coupe (911 RR)	2450	1530	1480	38:62	440
Sports Coupe (Corvette)	2722	1580	1530	50:50	455
Muscle Car (Mustang GT)	2720	1580	1740	55:45	500
Luxury Sedan (S-Class)	3106	1620	2100	55:45	540
SUV (RAV4)	2690	1590	1700	57:43	600
Full-size SUV (Tahoe)	2946	1700	2500	52:48	680
Pickup Truck (F-150)	3109	1710	2200	57:43	700
Electric Sedan (Model 3)	2875	1580	1760	47:53	430
Electric SUV (Model Y)	2890	1636	1980	46:54	470
Mid-engine Supercar (488)	2650	1580	1475	42:58	420
Front-engine GT (Aston DB11)	2805	1570	1760	51:49	460
Kei Car (Suzuki Alto)	2460	1300	650	63:37	450
Minivan (Odyssey)	3000	1630	1980	56:44	570
Rally Car (Impreza WRX)	2625	1530	1400	57:43	470
Formula Car (F1)	3600	1600	798	45:55	280
Open-wheel Prototype (LMP2)	3000	1530	930	43:57	310

Frequently Asked Questions

Adding mass behind the rear axle shifts the CoM rearward. The magnitude depends on the cargo mass relative to total vehicle mass and the distance from the current CoM. For example, placing a 50 kg load 500 mm behind the rear axle on a 1500 kg car with a 2700 mm wheelbase will shift the longitudinal CoM approximately 16 mm rearward. This reduces front axle load percentage by roughly 1%, which can measurably reduce front-end grip during braking.

A rear-engine car (like a Porsche 911) places approximately 60-62% of mass behind the rear axle. This creates a higher polar moment of inertia about the yaw axis, meaning the car resists direction changes but is harder to recover once rotation begins. The rearward CoM also increases rear tire loading, providing strong traction but reducing the margin before rear-end breakaway. The longitudinal CoM position directly determines the steady-state understeer gradient coefficient.

Most production cars have a lateral CoM offset under 10 mm from the centerline. Offsets up to 15 mm are common due to asymmetric component placement (driver, exhaust, battery). Beyond 20 mm, tire wear asymmetry becomes noticeable over 15,000 km. Race teams target under 5 mm and use ballast plates to correct imbalance. This calculator reports lateral offset so you can evaluate whether correction is warranted.

Yes. A full 60-liter fuel tank holds approximately 44 kg of gasoline (density ≈ 0.737 kg/L). If the tank is located 800 mm behind the front axle on a 1400 kg car, running from full to empty shifts the longitudinal CoM by roughly 25 mm forward. For track use, calculate CoM at both full and near-empty conditions. This tool allows you to add fuel as a component at its actual tank position.

Manufacturer specifications typically report curb weight distribution without driver or fluids beyond factory fill levels. Real-world deviation is ±2-3% once a driver (75 kg, positioned roughly 1000 mm from the front axle) and personal items are added. Corner-weight scales provide ±0.5 kg accuracy per wheel. If using spec-sheet data, treat results as estimates and add the driver as a separate component for better accuracy.

This tool calculates longitudinal (X) and lateral (Y) CoM positions on the horizontal plane. Vertical CG height requires a tilt-table or pendulum test, which involves physically inclining the vehicle and measuring axle load changes at known angles. The vertical CG height formula is h = L × ΔW / (W_total × tan(θ)), where θ is the tilt angle. This measurement cannot be computed from static corner weights alone.