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.

Output Watts (W)

Required number input.

Input Watts (W)

Required number input.

Real output-power fraction of real input power at the specified transformer operating point. 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 Percent (%)

The resulting efficiency percent returned as a number.

• Transformer ratios and losses depend on waveform, frequency, core material and flux, turns, winding resistance, leakage, magnetizing current, load power factor, temperature, insulation, and construction. Ideal turns-ratio equations do not establish regulation or thermal rating.
• 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.

• PA Backoff Efficiency

  Drain efficiency at a power-backoff operating point from RF output and DC input power.

• PA Saturated Power

  RF output power at an observed saturated operating point from measured sinusoidal RMS output voltage into a resistive load.

• Transformer Efficiency

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