The apparent power S in volt-amps (VA) is equal to 1000 times the real power P in kilowatts (kW), divided by the power factor PF:
S(VA) = 1000 × P(kW) / PF
So volt-amps are equal to 1000 times kilowatts divided by the power factor.
volt-amps = 1000 × kilowatts / PF
VA = 1000 × kW / PF
What is the apparent power in volt-amps when the real power is 3 kW and the power factor is 0.8?
S = 1000 × 3kW / 0.8 = 3750VA