Whenever the available AC source voltage differs from the load voltage, we use transformers to increase or decrease the voltage levels. Here is a simple transformer kVA calculator, that can help you determine the required kVA rating of transformer for a given load.
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Transformer kVA selection guide
Transformer kVA capacity is calculated based load voltage and load current. Apart from kVA, primary and secondary voltage, frequency, winding connection type, environmental conditions, cooling and noise are some of other factors considered during selection of transformer.
To calculate the kVA we need to know at least the line-to-line voltage (V) requirement of the load and the maximum load phase current (I).
For a single-phase transformer, kVA = (V x I) /1000
For a Three-phase transformer, kVA = (√3 x V x I) /1000 = (1.732 x V x I) /1000
Are you struggling to calculate amperage of your load? Use this calculator: Calculate Amperage from kW
Standard transformer kVA ratings for single phase and three phase dry type transformer is listed by Schneider Electric, a reputed transformer manufacturer in the this link.