Transformer Calculator

Select the number of phases and enter the transformer rating, primary voltage, and secondary voltage. The calculator will evaluate and display the primary and secondary full-load current along with the turns ratio.

Transformer Formula

The following formulas are used to calculate the primary and secondary full-load currents.

Single phase full load = tr * 1000 / v

three phase full load = tr * 1000/ (1.73 * V)

  • Where tr is the transformer rating
  • v is the voltage (either primary or secondary)

The following formula is used to calculate the transformer turns ratio.

Turns Ratio = I2/I1

  • Where I1 is the primary current
  • I2 is the secondary current
transformer calculator

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