Volt-amps (VA) to Amps Electrical Conversion Calculator
Convert volt-amps to amps by entering the power and voltage below. This also supports three-phase circuits, but calculates standard single-phase circuits by default.
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How to Convert Volt-amperes to Amps
Before we can convert volt-amps to amps we need to understand a little bit more about what these measurements are. A volt-ampere (VA) is a measure of the apparent electrical power while an amp (A) is a measure of electrical current.
Thus, to convert between them we need to use the formula for power.
Power = Voltage × Current
Using the power formula as the starting point, by reversing the formula you can convert power in volt-amps to current in amps:
Current(A) = Power(VA) ÷ Voltage(V)
So, using the formula above, converting volt-amps to amps is as easy as dividing the volt-amps by the voltage.
For example, let’s find the amps for a single-phase electrical circuit with 1,800 volt-amps of power at 120 volts.
Current(A) = 1,800 VA ÷ 120 V
Current(A) = 15 A
So, a circuit with 1,800 volt-amps of apparent power at 120 volts has a current rating of 15 amps.
How to Convert Volt-amps to Amps for Three-Phase Circuits
The volt-amps to amps conversion is a little bit different for a three-phase electrical circuit. To calculate, use the modified three-phase formula.
Current(A) = Power(VA) ÷ (√3 × Voltage(V))
For a three-phase electrical circuit, the current in amps is equal to the power in volt-amps divided by the square root of three times the voltage.
In this formula, voltage is the line-to-line voltage of the circuit.
For example, let’s find the amps for a three-phase electrical circuit with 33,255 volt-amps of power at 480 volts.
Current(A) = 33,255 VA ÷ (√3 × 480 V)
Current(A) = 33,255 VA ÷ 831.38 V
Current(A) = 40 A
We can see that a circuit with 33,255 VA of apparent power at 480 V will have a current rating of 40 A.