Amps to Volt-Amps (VA) Electrical Conversion Calculator

Convert amps to volt-amps by entering the current and voltage below. The calculator supports three-phase circuits, but standard single-phase circuits are set by default.



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How to Convert Amps to Volt-Amperes

Before converting amps to volt-amps it will be helpful to understand more about what these measurements are. An amp (A) is a measure of electric current, while a volt-ampere (VA) is a measure of apparent power in an electrical circuit.

Because this is a conversion from current and voltage to power, it’s possible to use the formula for power.
Power = Voltage × Current

Swapping out the variables with amps, volt-amps, and volts we get this formula:
Power(VA) = Voltage(V) × Current(A)

Using this formula, volt-amps can be found by multiplying volts times amps.

For example, let’s find the volt-amps for a single-phase circuit with 20 amps of current at 120 volts.

Power(VA) = 120 V × 20 A
Power(VA) = 2,400 VA

So, a 120 volt circuit with 20 amps of current should have 2,400 volt-amps of apparent power.

How to Convert Amps to Volt-amps for a Three-Phase Circuit

Converting amps to volt-amps is slightly different for three-phase electrical circuits. A modified formula will be needed for the calculation.

Power(VA) = √3 × Voltage(V) × Current(A)

For three-phase circuits, the apparent power in volt-amps is equal to the square root of 3 times the voltage times to current in amps.

In this formula, voltage is the line-to-line voltage of the circuit.

For example, let’s find the amps for a 480 volt three-phase electrical circuit with 60 amps of current.

Power(VA) = √3 × 480 V × 60 A
Power(VA) = 49,883 VA

Thus, a 480 volt three-phase electrical circuit with 60 amps of current has an apparent power of 49,883 volt-amperes.