# Transformer kVA to Amps Rating Calculator with Calculations and Examples [Single/Three Phase Transformer]

The transformer kVA rating can be used to calculate amps.

List of Contents

## Transformer Amps from kVA rating Formulas

Single-phase Transformer Amps = Transformer kVA rating * 1000/E

Three-phase Transformer Amps = Transformer kVA rating * 1000 / (E*1.73)

## Examples for Transformer Amps calculations

### 225 kVA, 3.3 kV Transformer amps

Find the amperage rating of a transformer having 225 kVA and 500 V in case of single and three phase

In the case of single-phase: I = 225 * 1000 / 3.3kV = 68.18 Amps

In case of three-phase: I = 225 * 1000 / (230 * 1.73) = 39.41 Amps

## 500 kVA, 3.3 kV Transformer Amps

• 500 kVA Single Phase Transformer: I = 500 * 1000 / 3.3kV = 151.5 Amps
• 500 kVA Three phase Transformer: I = 500 * 1000 / (3.3 * 1.73 kV) = 87.58 Amps

## 1000 kVA Transformer Amps

• 1000 kVA Transformer Single Phase Amps when V = 33 kV: 30.30 A
• 1000 kVA Transformer Single Phase Amps when V = 33 kV: 17.51 A

### 1000 kVA Transformer Chart for Different Voltage Levels

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