RC Calculators & Tools
Free online tools to dial in your RC car between rounds — no app install, no signup. Works on phone, tablet, or desktop.
RC Gear Ratio Calculator
Pinion + spur + internal ratio → final drive ratio, rollout, and chart of nearby combos.
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RC Top Speed Calculator
Motor KV, battery voltage, gearing, and tire size → top speed of any electric RC car.
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RC Gear Ratio & Rollout Chart
Pinion/spur chart for any class — gear ratio (FDR) or rollout (mm). 1/10, 1/12 pan, 1/8 presets included.
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RC Corner Weight Calculator
Enter per-wheel weights to compute cross weight and balance — critical for oval and on-road tuning.
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RC Shock Oil Weight Converter
Convert wt ↔ cSt ↔ Mugen / Yokomo numbers, plus starting-point oil weights by class.
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RC Battery Runtime Calculator
How long will your LiPo last? Estimate runtime by class and driving style.
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RC Pill Insert Calculator
Diff insert geometry for 1/8 buggies — match your gear-diff pill setup to your conditions.
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Want them on your phone at the track?
Every calculator here — plus shock oil viscosity, fuel usage, and a few extras — lives in the free Pit Calc Pro app for iOS and Android.
Get Pit Calc Pro →