🧮 RC Calculators & Tools
Every calc a racer or basher needs — gearing, speed, LiPo, motor and prop. Live, mobile, free, no signup. Change a number, get the answer instantly.
⚙️ Gear Ratio & Rollout
Final drive ratio and rollout (how far the car rolls per motor turn) — the number racers actually tune by.
Lower FDR = more top speed but hotter motor/ESC. Higher FDR = more punch & cooler. Internal ratio is printed in your chassis manual.
🏎️ Top Speed
Theoretical top speed from motor KV, battery, gearing and tire size.
"Real" applies ~85% for efficiency, voltage sag and drag. Actual speed varies with traction, weight and tire growth.
🔋 LiPo Pack & Runtime
Pack voltages, energy, max safe current and runtime — plus a C-rating check.
🌀 Motor KV → RPM
No-load and loaded motor RPM from KV and pack voltage.
KV = RPM per volt. Loaded uses ~80% for a typical geared load.
✈️ Prop Pitch Speed (planes)
Theoretical max airspeed a prop can deliver at a given RPM.
Real airspeed is ~85% of pitch speed after prop slip.
More tools coming — setup-sheet builder, shock-oil converter, corner-weight and thrust calc. Join the crew to save your rigs and get AI setup help.