Line-to-Phase Voltage Calculator
Select the connection type and conversion direction. This calculator assumes a balanced three-phase system and requires an explicit Y or Δ selection.
A QUICK WALKTHROUGH
How to use this tool
- Select Y (star) or Δ (delta).
- Choose line-to-phase or phase-to-line conversion.
- Enter a positive RMS voltage and calculate.
Formula
Balanced three-phase RMS values: Y: line voltage = √3 × phase voltage. Δ: line voltage = phase voltage. The reverse conversions divide by √3 for Y and leave the value unchanged for Δ.
Scope and limits
This arithmetic conversion assumes balanced three-phase RMS voltages and the selected ideal connection. It does not provide electrical safety guidance or equipment recommendations.
GOOD TO KNOW
Common questions
Why must I choose Y or Δ?
The relationship differs by connection: Y uses a √3 factor; Δ uses a factor of 1.
Does this apply to unbalanced systems?
No. The calculator is explicitly limited to balanced three-phase RMS values.