Transformer kVA calculator – Based on load

Whenever the available AC source voltage differs from the load voltage, we use transformers to increase or decrease the voltage levels. The calculation of kVA rating is crucial while sizing or selecting a transformer for a specific application. Here is a simple transformer kVA calculator, that can help you determine the required kVA rating of a transformer for a given load.

kVA calculator

Enter the Supply voltage:
Enter the Load current:
Supply type:

Transformer kVA capacity is calculated based on load voltage and load current. Apart from kVA, primary and secondary voltage, frequency, winding connection type, environmental conditions, cooling and noise are some of the other factors considered during selection of transformer.

Read More: Transformer selection and sizing

kVA calculation

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

Transformer kva calculator online

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.

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