Phase To Phase Voltage Calculator

If you’ve ever looked at a three-phase power system, you’ve seen terms like line-to-line or phase-to-phase voltage. But what do they really mean? Our Phase To Phase Voltage Calculator makes it easy to find this voltage in seconds. Whether you’re an engineer, technician, or student, this tool helps you calculate accurate results with clear steps and examples.

What Is Phase To Phase Voltage?

Phase to phase voltage, also called line-to-line voltage (VLL), is the voltage measured between any two of the three phase wires in a three-phase system.

In a balanced three-phase (wye or star) system:

VLL = √3 × VLN

Here’s what each symbol means:

So, if your line-to-neutral voltage (VLN) is 230 V, your phase-to-phase voltage is:

VLL = 1.732 × 230 = 398.36 V

That’s the value you’ll see on a standard three-phase 400 V system.

Why 1.732 for 3 Phase?

The number 1.732 (which is √3) comes from the geometry of three-phase electricity.

In a three-phase system, each phase is separated by 120 degrees. When you calculate the vector difference between two phases (say A and B), you get a multiplication factor of √3.

Think of it like this: if you draw the three phase vectors on a circle, they form an equilateral triangle. The line-to-line voltage is the diagonal across that triangle, which is √3 times longer than the side (the phase voltage).

That’s why we multiply or divide by 1.732 when converting between line and phase voltages.

How Do You Calculate Phase To Phase Voltage?

The formula is very simple and always accurate for balanced systems:

Phase-to-Phase (Line-to-Line) Voltage Formula:

VLL = √3 × VLN

Phase-to-Neutral (Line-to-Neutral) Voltage Formula:

VLN = VLL ÷ √3

Example 1:

If VLN = 230 V,

then VLL = 230 × 1.732 = 398.36 V

Example 2:

If VLL = 400 V,

then VLN = 400 ÷ 1.732 = 230.94 V

How to Measure Phase To Phase Voltage

To measure phase-to-phase voltage safely, follow these steps:

1. Turn on your multimeter and set it to AC voltage mode.
2. Connect one probe to Phase A and the other to Phase B.
3. Read the voltage displayed. That’s your phase-to-phase voltage.
4. Repeat for other combinations: A–C and B–C.

Always follow proper safety rules when dealing with live circuits.

How to Use Our Phase To Phase Voltage Calculator

Our Phase To Phase Voltage Calculator makes these calculations effortless. Here’s how you can use it:

1. Select the mode – Line to Line or Line to Neutral.
2. Enter your known voltage value.
3. Choose the unit (V, kV, or mV).
4. Click Calculate to get your result instantly.
5. See detailed step-by-step solutions with the applied formula.

For example, if you enter 230 V (Line to Neutral), the calculator will show:

• Step 1: Input VLN = 230 V
• Step 2: Formula: VLL = √3 × VLN
• Step 3: Result: 398.36 V

Example Calculation Table

Final Verdict

The Phase To Phase Voltage Calculator is your quick, reliable, and easy-to-use tool for three-phase power calculations. You don’t need to memorize formulas or do manual math. Just enter your values and get instant results with detailed steps.

Whether you’re testing a 400V system or learning about power distribution, this calculator saves time and ensures accuracy.

FAQs

How do you calculate phase to phase voltage?

Use the formula VLL = √3 × VLN, where √3 = 1.732.

Why do we multiply by 1.732?

Because the phase angles are 120° apart, the line-to-line voltage equals √3 times the line-to-neutral voltage.

What’s the typical phase-to-phase voltage in a 230V system?

It’s about 398 V, which is usually rounded to 400 V in most countries.

Can I measure phase-to-phase voltage with a multimeter?

Yes, set your multimeter to AC mode and measure between two phases.

Is phase to phase voltage higher than phase to neutral?

Yes, it’s √3 (1.732) times higher.