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.

Real Power (W) (W)

Required number input.

Line (V) (V)

Required number input.

Line Current (A) (A)

Required number input.

Calculate balanced three-phase motor power factor as real input power divided by √3 times line voltage and line current; the result is a magnitude. 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]

Power Factor

The resulting power factor returned as a number.

• 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.

• Ac Motor Reactive Power

  Calculate positive reactive-power magnitude for a balanced three-phase motor from line voltage, line current, and power factor.

• Headphone Impedance

  Calculate headphone impedance magnitude at a test frequency from RMS terminal voltage and RMS current; phase is not determined.

• Electrical Power In

  Compute electrical input power in watts from supply voltage times current draw.