Transformer Sizing

Calculate the required kVA rating for a transformer based on voltage and current requirements.

Load Requirements

Phase Type

Voltage (V)

Load Amperage (I)

Calculation Results

Enter voltage and current requirements

About this calculator

Quick Reference

kVAKilovolt-Amps

VVoltage

ICurrent (Amps)

1.732Square root of 3

Overview

Sizing a transformer correctly ensures that electrical equipment receives sufficient power without causing the transformer to overheat or fail.

💡

Pro Tips

Fun Facts

"Transformers only work with Alternating Current (AC), not Direct Current (DC)."
"Large power transformers can be up to 99% efficient."
"Some transformers are filled with oil to help with cooling and insulation."

Formula: kVA = (V · I) / 1000