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.

No-load secondary voltage (V)

Required number input.

Full-load secondary voltage (V)

Required number input.

Calculate transformer voltage regulation as (no-load secondary voltage − full-load secondary voltage)/full-load voltage ×100. Use measurements at the same primary voltage and frequency. 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]

Regulation Percent

The resulting regulation 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.

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