RC Corner Weight Calculator
Enter the weight measured at each wheel to see cross-weight (wedge), left/right balance, and front/rear bias. Works for all RC car scales and classes.
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Have this calculator — and more racing calculators — right on your phone at the track.
How to use this calculator
- • Place your RC car on a corner weight scale or four individual scales.
- • Enter the weight reading at each wheel in the corresponding corner above.
- • Cross-weight (wedge) is the percentage of total weight on the left-front + right-rear diagonal. A perfectly balanced car reads 50%.
- • Most oval racers aim for cross-weight between 48–52%. Road course and off-road cars benefit from being as close to 50% as possible.
- • Front bias tells you how much of the total weight sits on the front axle — useful for tuning initial turn-in vs. rear traction.
- • Left bias matters most for oval racing; road course and off-road cars should be close to 50%.
- • To adjust cross-weight, try shimming the ride height at opposite diagonal corners, or repositioning battery and electronics.
- • Your settings are automatically saved for your next visit.
What is cross-weight in RC cars?
Cross-weight — also called wedge — is one of the most important balance measurements in RC racing. It tells you how evenly the car's weight is distributed across its two diagonals: right-front + left-rear vs. left-front + right-rear.
A car with 50% cross-weight is perfectly balanced, meaning it will handle identically turning left and turning right. If cross-weight drifts more than a couple of percent from 50%, the car will feel different in left vs. right corners — typically pushing in one direction and getting loose in the other.
In full-size racing, crews adjust wedge intentionally for oval tracks. In RC, the goal is almost always 50% cross-weight, because most tracks have both left and right turns. Common causes of uneven cross-weight include an off-center battery, uneven ride height, or a slightly twisted chassis.
To measure corner weights, place the car on a flat surface with four individual scales (one under each tire) or a dedicated RC corner weight system. Record each reading, enter them above, and this calculator does the rest.
Free app
Pit Calc Pro
Have this calculator handy at the track
Pit Calc Pro puts this corner weight calculator — and 6 more tools — right on your phone, so you're never without it when you need it most.
- Corner weight calculator
- Gear ratio & FDR
- Pill insert geometry
- Top speed calculator
- Shock oil viscosity
- Fuel usage
