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.

Input power (W)

Required number input.

Output power (W)

Required number input.

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

The resulting efficiency returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• 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.

• Motor Efficiency %

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

• Input Power From Efficiency

  Derive the required input power from a delivered output power at a given efficiency percentage.

• Output Power From Efficiency

  Compute the delivered output power from an input power at a given efficiency percentage.