kVA to Amps Calculator
Convert apparent power in kilovolt-amps (kVA) to current in amps (A). Select single phase or three phase — for three phase, choose line to line or line to neutral voltage — enter the kilovolt-amps and volts, and press Calculate to get amps. Everything runs locally in your browser.
Select the phase number
Pick "Single phase" for a single AC circuit, or "Three phase" for a three-phase system. For three phase, also choose the voltage type: line to line (between two phases) or line to neutral (phase to neutral/ground).
Enter kVA and volts
Type the apparent power in kilovolt-amps (kVA) and the RMS voltage in volts (V). The voltage must be greater than zero — every formula divides by it — while 0 kVA is valid and gives 0 A.
Press Calculate, read amps
The phase current appears in amps (A), rounded to at most four decimals. Copy the result to your clipboard, or press Reset to clear everything and start over.
kVA to amps formulas
- Single phase kVA to amps calculation formula
- The current I in amps is equal to 1000 times the apparent power S in kilovolt-amps, divided by the voltage V in volts: I(A) = 1000 × S(kVA) / V(V). For example, 10 kVA at 120 V gives 1000 × 10 / 120 ≈ 83.3333 A.
- 3 phase kVA to amps formula — line to line voltage
- The phase current I in amps (with balanced loads) is equal to 1000 times the apparent power S in kilovolt-amps, divided by the square root of 3 times the line to line RMS voltage VL-L in volts: I(A) = 1000 × S(kVA) / (√3 × VL-L(V)). For example, 10 kVA at 480 V line to line gives 1000 × 10 / (√3 × 480) ≈ 12.0281 A.
- 3 phase kVA to amps formula — line to neutral voltage
- The phase current I in amps (with balanced loads) is equal to 1000 times the apparent power S in kilovolt-amps, divided by 3 times the line to neutral RMS voltage VL-N in volts: I(A) = 1000 × S(kVA) / (3 × VL-N(V)). For example, 25 kVA at 277 V line to neutral gives 1000 × 25 / (3 × 277) ≈ 30.0842 A.
- Which voltage type should I pick for three phase?
- Use line to line when your voltage is measured between two phases (e.g. 400 V in EU, 208/480 V in US commercial systems); use line to neutral when it is measured from one phase to neutral (e.g. 230 V in EU, 277 V in US). The two agree when VL-L = √3 × VL-N, which is exactly how balanced wye systems are defined.
- Why does the voltage type not matter in single phase?
- A single-phase circuit has one pair of conductors, so there is no line-to-line versus line-to-neutral distinction — the formula is always I(A) = 1000 × S(kVA) / V(V), with no √3 or 3× factor. The voltage-type selector applies only when "Three phase" is selected.
- Why must the voltage be greater than zero?
- Every kVA-to-amps formula divides the apparent power by the voltage, so 0 V would mean dividing by zero. The calculator shows a validation error instead of an infinite or meaningless current. Negative kVA or volts are rejected for the same physical-reasonableness reason.
Privacy: every calculation runs in your browser tab — no value you type is sent anywhere. Copy result uses your clipboard only. Results assume balanced sinusoidal RMS values; verify real installations with a multimeter.