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Corner Weight Calculator

Calculate cross-weight, axle distribution, and side balance from four scale readings.

Cross-weight (also called wedge or diagonal weight) is the percentage of total weight on one diagonal pair of corners. A balanced car has 50% cross-weight — meaning the left-front + right-rear diagonal carries the same load as the right-front + left-rear diagonal. Deviations from 50% cause the car to handle differently turning left versus turning right.

To measure corner weights, place the car on four individual scales (one under each tire) on a level surface. Roll the car forward and backward to settle the suspension, center the steering wheel, and ensure the fuel level and driver weight represent the intended use condition. Read all four scales simultaneously.

Corner Weights

Enter the weight reading from each scale. The layout matches the car viewed from above — left-front is the driver's side (LHD).

Select the unit that matches your scale readings.

FRONT
REAR

Results

Enter all four corner weights above to see results.
Terminology & How to Balance

Cross-Weight (Wedge / Diagonal) — The percentage of total vehicle weight on one diagonal pair: (LF + RR) ÷ Total × 100. A value of 50% means both diagonals carry equal load. This is the most important number for balanced handling in turns.

Front / Rear Distribution — The percentage of total weight on the front vs rear axle. This is determined primarily by engine placement and vehicle design. It cannot be changed meaningfully with spring preload — ballast is the only practical method.

Left / Right Distribution — The percentage of total weight on the left vs right side. Most cars are slightly left-heavy (LHD) or right-heavy (RHD) due to driver position and drivetrain layout.

How to adjust cross-weight: Adding spring preload at a corner increases the weight on that corner and its diagonal partner, while decreasing weight on the opposite diagonal. For example, adding preload at the left-front increases LF and RR, while decreasing RF and LR. The total vehicle weight does not change — it redistributes diagonally.

Which corner to adjust: If cross-weight is above 50% (LF+RR heavy), add preload at RF or LR — or remove preload at LF or RR. If below 50%, do the opposite. Adjust in small increments (1-2 full turns of the perch) and re-measure.