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.

Primary voltage (V)

Voltage applied to the primary winding.

Primary turns

Number of turns on the primary winding.

Compute the volts per turn of a transformer primary winding from the applied primary voltage and its turn count. 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]

Volts per turn (V/turn)

Voltage induced per turn of the winding.

• 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.

• Voltage Rating Check

  Check whether the voltage applied across a resistor is within its maximum working voltage rating, which defaults to 250 volts.

• Turns Ratio

  Compute the turns ratio of a transformer from its primary and secondary winding turns.

• Voltage Ratio

  Compute the transformer secondary voltage from the primary voltage and winding turns.