Enter your apparent power in kVA, voltage, and select your phase type (single or three-phase) to calculate the resulting current in amps — plus see the formula used and equivalent power in watts.
Current
--
Formula Used
--
Power (Watts)
--
A 50 kVA transformer can handle approximately 227 amps at 220V single-phase, or 131 amps at 220V three-phase. The exact amperage depends on the voltage and phase configuration.
To convert amps to kVA, multiply the current in amps by the voltage in volts, then divide by 1000. For three-phase circuits, also multiply by √3 (1.732).
At 240V single-phase, 30 amps equals 7.2 kVA. At 240V three-phase, 30 amps equals 12.5 kVA. The kVA value depends on both current and voltage.
Single-phase uses the formula I = kVA × 1000 / V, while three-phase uses I = kVA × 1000 / (√3 × V). Three-phase systems are more efficient and typically used for higher power applications.
kVA (kilovolt-amperes) is apparent power, which is the product of voltage and current. To find current, you must divide the apparent power by voltage, making voltage essential for the calculation.
kVA is apparent power, the total power in an AC circuit. kW is real power, the actual power consumed. They're related by the power factor: kW = kVA × Power Factor.
This calculator is designed for AC circuits. For DC circuits, the relationship is simpler: Power (watts) = Voltage × Current, since there's no reactive power component in DC systems.