You need to know the voltage. Volts x Amps = VA. The K just indicates 1,000 x VA.
Amps * volts / 1000
how to calculate electrical power kVA?
Voltage (volts) divided by Resistance (ohms). For AC circuits the resistance part of this formula is replaced by "impedance" which involves the effects of capacitors and inductors as well.
KVa is not the same as the amperes because KVa is the unit for reactive power while amperes is the unit for current.