How to Size a Single Phase and Three Phase Transformer in kVA?

We know that a transformer is always rated in kVA. Below are the two simple formulas which can be used to find and calculate the rating of Single Phase and Three Phase Transformers.

Sizing a Single Phase Transformer

Rating of Single Phase Transformer:

P = V x I

Sizing a Three Phase Transformer

Rating of a Three Phase Transformer:

P = √3 x V x I

The following table shows the dry transformer data of standard kVA rating, Voltage and Current rating for both single phase and three phase transformers.