kVA to Amps Calculator

Converting kilovolt-amperes (kVA) to amps is a common step when sizing electrical components like circuit breakers, wiring, and generators — and the result changes depending on whether you're working with a single-phase or three-phase circuit. Enter your apparent power (kVA) and voltage (V), then select your phase type to get the current in amps. Secondary outputs include the formula used and the equivalent power in watts.

kVA

Enter the apparent power in kilovolt-amperes

V

Enter the RMS voltage in volts

Select the type of electrical circuit

Results

Current

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Formula Used

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Power (Watts)

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Results Table

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Frequently Asked Questions

How many amps can a 50 kVA transformer handle?

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.

How do I convert amps to kVA?

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).

How many kVA is 30 amps?

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.

What's the difference between single-phase and three-phase calculations?

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.

Why do I need to know the voltage to convert kVA to amps?

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.

What is apparent power (kVA) versus real power (kW)?

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.

Can I use this calculator for DC circuits?

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.