Transformer sizing calculator

Welcome to our Transformer Sizing Calculator! This tool is designed to help you determine the appropriate size of transformers in kVA based on your specific requirements. Transformers play a crucial role in electrical power systems, converting voltage levels for efficient power distribution. Proper sizing ensures optimal performance, reliability, and safety.

Here is a simple transformer sizing calculator, that can help you determine the required kVA rating of a transformer for a given load.

Transformer size calculator

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

Transformer size 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 the selection of a transformer.

Steps to calculate the transformer size:

  • Enter the voltage rating of the load.
  • Enter the full load current.
  • Select the load type: either single phase or three phase.
  • Click on the calculate button to know the transformer size.

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 sizing calculator

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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