kVA to Amperage Calculator — Apparent Power to Current
Enter the apparent power in kVA and the system voltage to calculate the current in amperes — for both single-phase (A = kVA × 1000 ÷ V) and three-phase systems (A = kVA × 1000 ÷ (V × √3)).
kVA
V
Phase
Single-phase: A = (kVA × 1000) ÷ V
- 1
Apparent power (VA)
10 × 1000 = 10,000 - 2
Current A = VA ÷ V
10,000 ÷ 240 = 41.67
How does this calculator work?
Current (A) = kVA × 1000 ÷ V for single-phase, or kVA × 1000 ÷ (V × √3) for three-phase. No power factor is needed because kVA is apparent power. Enter rated kVA, voltage and phase to get amperage instantly, plus active power at PF = 0.8, 0.9 and 1.0.
Formula
How this is calculated
Apparent power (kVA) is the product of RMS voltage and RMS current in an AC circuit, without regard to the phase angle between them. Unlike real (active) power in kilowatts, apparent power does not require a power factor — so the kVA-to-amps conversion is straightforward: rearrange the definition S = V × I (single-phase) or S = √3 × V_L × I (three-phase) to solve for I.
For single-phase systems, the current equals the apparent power in volt-amperes divided by the line voltage: A = (kVA × 1000) / V. This applies to typical household circuits (120 V or 240 V), single-phase transformers, and single-phase UPS units.
For three-phase systems, the relationship uses the line-to-line voltage and the √3 factor: A = (kVA × 1000) / (V_LL × √3). This applies to industrial equipment, three-phase transformers, and commercial generators. The voltage you enter should be the line-to-line (phase-to-phase) voltage, not the line-to-neutral voltage. The calculator also shows active power at three representative power factors (1.0, 0.9, 0.8) so you can estimate real-power demand.
Frequently asked questions
Because kVA is apparent power — the total volt-ampere product — which already includes the effect of the phase angle. To get active power (kW) you do need the power factor: kW = kVA × PF. But for current, A = kVA × 1000 / V (single-phase), which needs only voltage.
Enter the line-to-line (phase-to-phase) voltage — for example 415 V (Europe), 480 V or 208 V (North America). The √3 factor (≈ 1.732) in the formula accounts for the three-phase relationship between line-to-line and line-to-neutral voltages.
The kVA rating is usually printed on the nameplate. For transformers it is the maximum continuous apparent power the unit can deliver. Divide by the output voltage (and by √3 for three-phase) to find the maximum rated current on the secondary side.
Also known as
TG we-Calculate Editorial Team. (2026). kVA to Amperage Calculator — Apparent Power to Current [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/kva-to-amperage-calculator
TG we-Calculate Editorial Team. "kVA to Amperage Calculator — Apparent Power to Current." TG we-Calculate. 2026. https://we-calculate.com/calculator/kva-to-amperage-calculator.
TG we-Calculate Editorial Team, "kVA to Amperage Calculator — Apparent Power to Current," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/kva-to-amperage-calculator
@misc{wecalculate_kva_to_amperage_calculator, title = {kVA to Amperage Calculator — Apparent Power to Current}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/kva-to-amperage-calculator}}, year = {2026}, note = {TG we-Calculate} }
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