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

• 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.

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