Amps to kVA
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Amps to kVA Calculator

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V
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Single phase amps to kVA calculation formula

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

S(kVA) = ( I(A) × V(V) ) / 1000

3 phase amps to kVA calculation formula

For three-phase systems, the calculation depends on whether you are using line-to-line voltage or line-to-neutral voltage.

Calculation with line to line voltage

Use the square root of 3 (approx 1.732):

S(kVA) = ( √3 × I(A) × VL-L(V) ) / 1000

Calculation with line to neutral voltage

Use a factor of 3:

S(kVA) = ( 3 × I(A) × VL-N(V) ) / 1000

See also

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Frequently Asked Questions

How many kVA is 1 amp?
The kVA value of 1 amp depends entirely on the voltage and the phase type. For example, at 120V single phase, 1 Amp = 0.12 kVA. At 240V single phase, 1 Amp = 0.24 kVA.
How many kVA is 20 Amps?
For a standard 120V single-phase circuit: 20 Amps × 120 Volts / 1000 = 2.4 kVA. For a 220V circuit: 20 Amps × 220 Volts / 1000 = 4.4 kVA.
How many kVA is 100A?
At 240V single phase, 100A results in 24 kVA. In a 480V three-phase system (Line-to-Line), 100A would be approx 83.14 kVA.
How do I convert kVA to ampere?
To convert kVA back to Amps, use the formula: Amps = (kVA × 1000) / Volts for single phase. For three phase (line-to-line), use Amps = (kVA × 1000) / (√3 × Volts).