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.

Mechanical power (W)

Mechanical output power at the shaft.

Electrical power (W)

Electrical input power to the motor.

Compute motor efficiency percent as mechanical output power over electrical input power times one hundred. 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]

Efficiency (%)

Conversion efficiency of the motor.

• 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.

• Efficiency Percent

  Compute the percentage efficiency of a power conversion from output over input power.

• Transformer Efficiency

  Compute transformer efficiency percent as output power divided by input power times 100.

• Electrical Power In

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