RC Calculators

Every calculator on the site, grouped by RC model and task. Tools marked Coming soon are planned and not yet published.

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RC Car Calculators

RC Car Speed CalculatorTheoretical top speed from motor KV, voltage, gearing and tire size.
RC Gear Ratio CalculatorExternal and final drive ratio from spur, pinion and internal ratio.
RC Tire Size CalculatorSpeed change when you swap to a different tire diameter.
RC Scale CalculatorConvert between full-size dimensions and model scale.

RC Boat Speed CalculatorTheoretical pitch speed from propeller RPM and pitch.
RC Boat Runtime CalculatorEstimated runtime from battery capacity and average current draw.
RC Boat Power-to-Weight CalculatorCompare motor power per kilogram of boat mass.

LiPo Voltage CalculatorNominal and full-charge voltage from LiPo cell count.
Battery Series Parallel CalculatorCombined pack voltage and capacity for series/parallel wiring.
RC Battery Runtime CalculatorIdeal and adjusted runtime from capacity, current and usable fraction.
LiPo C Rating CalculatorTheoretical continuous current from capacity and C rating.
LiPo Charge Time CalculatorIdeal charge time estimate from capacity and charge current.
RC Battery Charger Wattage CalculatorCharger output power from cell count and charge current.
RC ESC Amp CalculatorESC current rating target from measured draw and safety margin.

RC Motor KV RPM CalculatorTheoretical no-load motor RPM from KV and voltage.
Propeller RPM CalculatorPropeller shaft RPM from motor RPM and gear reduction.
Propeller Pitch Speed CalculatorTheoretical pitch speed from propeller RPM and pitch.
Watts to Amps CalculatorCurrent draw from electrical power and voltage.
RC Motor and Propeller Performance CalculatorMotor RPM, pitch speed and electrical power in three modules.

RC Airplane Speed CalculatorTheoretical airspeed from propeller RPM and pitch.
RC Wing Loading CalculatorWing loading from aircraft mass and wing area.
RC Plane CG CalculatorCenter of gravity percentage from chord and CG distance.
RC Thrust-to-Weight CalculatorThrust-to-weight ratio from measured thrust and weight.
RC Plane Flight Time CalculatorEstimated flight time from capacity and average current.

RC Helicopter Head Speed CalculatorRotor head speed from motor KV, voltage and gear reduction.
RC Helicopter Gear Ratio CalculatorPer-stage and total reduction for helicopter drivetrains.

Drone Flight Time CalculatorEstimated flight time from capacity and average current.
Drone Thrust-to-Weight CalculatorThrust-to-weight ratio for multirotor setups.