Corner weight and cross weight calculator
Enter the four scale numbers. Left % is (LF + LR) divided by total weight. Rear % is (LR + RR) divided by total. Cross weight, also called wedge, is (RF + LR) divided by total. Bite is LR minus RR.
How to use it
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Which diagonal is cross weight?
Most oval racers quote cross weight as RF plus LR. Some racers, and many road racers, use LF plus RR. The calculator shows both, so match the one your setup sheet uses.
What moves the numbers
Turning a jack bolt or spring adjuster moves weight between the two diagonals. It barely changes left % or rear %. To change those, you have to move weight, such as ballast, on the car.
Common questions
Can I use kilograms instead of pounds?
Yes. The percentages come out the same either way. Use the same unit for all four corners.
What is bite?
Bite is the left rear weight minus the right rear weight. Many dirt racers write it down at every scale session as a quick check on the rear of the car.
What cross weight should I run?
It depends on the car, the track and the tires. Start from your chassis builder's baseline and change it in small steps.
Why do my numbers change each time I scale?
Small changes in tire pressure, fuel, driver position or pad level move the numbers. Keep all of them the same every time.
Does the total need to match the class minimum?
This calculator only adds the four corners. Check your class rules for how weight is measured at tech.
Keep your scale numbers with the setup
RaceNight setup sheets log chassis specs, scales and tire temps, and they work with no cell service. 14-day free trial.