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ElecToolsHQ

Transformer kVA Calculator

Calculate a transformer's kVA rating from voltage and current (kVA = V × I ÷ 1000).

Formula

kVA = (V × I) ÷ 1000

kVA
Transformer rating, in kilovolt-amps
V
Voltage, in volts
I
Current, in amps

What this calculator does

Calculates a transformer's kVA rating from its rated voltage and current.

Use cases

  • Verify a transformer's nameplate kVA rating against voltage and current
  • Size a replacement transformer for a known load
  • Estimate available capacity before adding load to an existing transformer

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