Free tools

Free racing calculators

Gear, rollout, speed, scale and stagger math for RC and full-size racers. Free, no sign-up, and they work in your phone's browser. Each tool shows the formula it uses, so you can check the math.

RC racing

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Dirt and asphalt cars

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Want these numbers saved with every setup? RacerRX is the RC setup app, and RaceNight is the setup app for full-size dirt and asphalt cars. Both have a 14-day free trial.

See RacerRX
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See RaceNight