How to convert Amps to kVA

Single phase Amps to kVA calculation formula

S(kVA) = I(A) × V(V) / 1000

The apparent power S in kilovolt-amps (kVA) is equal to the phase current I in amps (A), multiplied by the RMS voltage V in volts (V), divided by 1000.

So,

kVA = A x V / 1000
kilovolt-amp = amp x volt / 1000

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V

Power (S) = 2,5A x 110V / 1000 = 0,275kVA

3 phase Amps to kVA calculation formula

Line to line voltage

S(kVA) = √3 × I(A) × VL-L(V) / 1000

The apparent power S in kilovolt-amps (kVA) is equal to square root of 3, multiplied by the phase current I in amps (A), multiplied by the line to line RMS voltage VL-L in volts (V), divided by 1000.

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So,

kVA = √3 × A x V / 1000
kilovolt-amp = √3 × amp x volt / 1000

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V

Power (S) = √3 x 2,5A x 110V / 1000 = 0,476kVA

Line to neutral voltage

S(kVA) = 3 × I(A) × VL-N(V) / 1000

The apparent power S in kilovolt-amps (kVA) is equal to 3, multiplied by the phase current I in amps (A), multiplied by the line to neutral RMS voltage VL-N in volts (V), divided by 1000.

So,

kVA = 3 × A x V / 1000
kilovolt-amp = 3 × amp x volt / 1000

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V

Power (S) = 3 x 2,5A x 110V / 1000 = 0,825kVA

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