Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Kv (rpm/V)

Motor velocity constant in rpm per volt.

Compute the torque constant Kt in newton meters per ampere from the motor velocity constant Kv using Kt = 60 / (2 * pi * Kv). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Torque constant Kt (N·m/A)

Torque produced per ampere of current.

• Motor constants, current, torque, speed, reactive power, and propeller thrust depend on winding temperature, controller, supply sag, losses, saturation, load curve, airflow, and operating point. Nameplate constants and ideal propeller laws need test data for final sizing.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Brushless Motor Kv To Kt

  Convert a brushless motor speed constant in RPM per volt to ideal torque constant in newton-meters per ampere using 60/(2πKv); winding and measurement conventions must match.

• Mechanical Power

  Compute mechanical output power in watts from torque in newton meters times angular speed in radians per second.

• Ferrite Core Area Product

  Estimate required ferrite core window-area × cross-section from the Magnetics design form WaAc=Pout·Dcma/(Kt·Bmax·f). Enter circular-mils-per-ampere current-density allowance, gauss, hertz, and the topology constant from the same design method; output is cm⁴.