Single phase amps to kVA calculation formula
The apparent power S in kilovoltamps is equal to current I in amps, times the voltage V in volts, divided by 1000:
S_{(kVA)} = I_{(A)} × V_{(V)} / 1000
Three phase amps to kVA calculation formula
Calculation with line to line voltage
The apparent power S in kilovoltamps is equal to phase current I in amps, times the line to line RMS voltage V_{LL} in volts, divided by 1000:
S_{(kVA)} = √3 × I_{(A)} × V_{LL(V)} / 1000
Calculation with line to neutral voltage
The apparent power S in kilovoltamps is equal to phase current I in amps, times the line to neutral RMS voltage V_{LN} in volts, divided by 1000:
S_{(kVA)} = 3 × I_{(A)} × V_{LN(V)} / 1000
Where,

S = Apparent Power in VoltAmps

V = Voltage in Volts

I = Current in Amperes

V_{LL} = Line to Line Voltage in 3Phase Circuits

V_{LN} = Line to Neutral Voltage in 3Phase Circuits