kVA to Amps Calculator — Single-Phase and Three-Phase

Calculator

A kVA to amps calculator finds current from apparent power and voltage using I = 1000 × kVA / V for single-phase and I = 1000 × kVA / (√3 × V) for three-phase circuits.

kVA to Amps Calculator

Runs in this browserUses the displayed formula

Inputs are calculated only in this browser. Three-phase uses line-to-line voltage; if the power factor is unknown, use 1 for resistive loads and 0.8-0.9 for motors.

Examples

Phase

Capacity

kVA

Voltage

Current

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What is it

kVA (kilovolt-ampere) is the apparent power unit used to rate transformers and generators. Because it is defined as voltage times current regardless of power factor, the rated current follows directly from capacity and voltage. Three-phase calculations use line-to-line voltage divided by √3, which is useful for checking transformer secondary current or breaker sizing.

Single-phase: I = 1000 × kVA / V · Three-phase: I = 1000 × kVA / (√3 × V)

How to use

1Pick single-phase or three-phase.
2Enter capacity (kVA) and voltage (V).
3Press calculate to get the current in amps.

Reference

kVA to Amps Calculator — Single-Phase and Three-Phase Reference
Capacity	Condition	Current
10kVA	1-phase 220V	45.45A
50kVA	3-phase 380V	75.97A
100kVA	3-phase 480V	120.28A

Sources & standards

BIPM — The International System of Units (SI Brochure) - BIPM
IEC Electropedia — International Electrotechnical Vocabulary - IEC
MDN Web Docs: Client-side web APIs - MDN Web Docs

FAQ

What is the rated current of a 50 kVA transformer at 380V three-phase?

I = 1000 × 50 / (√3 × 380) ≈ 75.97A.

What is the difference between kVA and kW?

kVA is apparent power (voltage times current), while kW is real power that does work. kW = kVA × power factor, so kW is smaller than kVA whenever the power factor is below 1.

Is kVA to amps input sent to a server?

No. This calculator runs in your browser and does not send input to a server.