RC Hobby Calculators
Free online RC hobby calculators.
Calculate flight time, battery charge time, motor KV, gear ratios, and more for RC aircraft, cars, and drones.
LiPo Battery Burst Current Calculator
Find your LiPo battery maximum burst and continuous discharge current. Enter capacity and C-rating to avoid motor burnout or ESC damage.
RC Aircraft Thrust-to-Weight Calculator
Calculate thrust-to-weight ratio for RC planes, drones, and helicopters. Compare your result against trainer, sport, and 3D flight benchmarks.
RC Aircraft Center of Gravity Calculator
Calculate CG position as a percentage of mean aerodynamic chord for RC aircraft. Returns forward and aft limits for trainers, sport planes, and delta wings.
RC Battery Parallel Pack Calculator
Calculate combined mAh, C-rating, and max discharge current for RC LiPo batteries in parallel. Returns safe current limits and runtime gain over a single pack.
RC ESC Amperage Rating Calculator
Find minimum ESC amperage for RC cars, planes, and drones from motor KV and battery cell count. Returns continuous and burst current with safety margin.
RC Motor KV to RPM Calculator
Calculate RC motor RPM from KV rating and battery voltage (RPM = KV × volts) for any LiPo cell count. Returns no-load RPM and prop size recommendations.
RC Propeller Pitch Speed Calculator
Calculate theoretical pitch speed of an RC plane or drone propeller from pitch, diameter, and RPM. Returns mph and km/h plus actual speed estimate.
RC Servo Torque Calculator
Calculate RC servo torque from control surface area, airspeed, and hinge moment. Returns oz-in and kg-cm ratings needed for airplane, car, and boat builds.
RC Wing Loading Calculator
Calculate RC wing loading in oz/sq ft and g/dm² from all-up weight and wing area. Returns stall speed estimate and handling class from trainer to sport flier.
LiPo Battery Charge Time Calculator
Calculate how long it takes to charge a LiPo battery at any charge rate. Find the safe 1C charge rate to maximize battery lifespan.
RC Aircraft Flight Time Calculator
Calculate estimated flight time for RC planes, quadcopters, and helicopters based on battery capacity, voltage, and motor current draw.