Power & phase
kVA to Amps Calculator
Current equals apparent power in volt-amperes divided by voltage. Balanced three-phase current also divides by the square root of three.
Convert apparent power in kVA to current for single-phase or balanced three-phase systems.
Calculated result
Calculated current
Calculating…
Calculated locally in your browser
Planning math only. Verify equipment specifications and installation requirements separately.
What this calculator returns
Power factor is not required because kVA already represents apparent power.
Formula and variables
The calculation runs entirely in your browser. Static formulas, definitions, examples, and tables remain readable without JavaScript.
I = 1000 × kVA / V (1φ); I = 1000 × kVA / (√3 × VLL) (3φ).
- P
- Real power, in watts or kilowatts.
- S
- Apparent power, in volt-amperes or kilovolt-amperes.
- V
- RMS voltage; line-to-line voltage in three-phase modes.
- I
- Line or circuit current, in amperes.
- PF
- Power factor, expressed as a ratio from greater than zero through one.
- Q
- Reactive power, in volt-amperes reactive.
kVA is apparent power and VLL is line-to-line voltage for three-phase.
Worked example
| Input | Value |
|---|---|
| Phase | Single-phase AC |
| Apparent power | 10 kVA |
| Voltage | 240 V |
10 kVA at 240 V single-phase is 41.67 A; at 480 V three-phase it is about 12.03 A.
Reference table
| Voltage | Amps at 1 kW | Amps at 5 kW | Watts at 10 A |
|---|---|---|---|
| 120 V | 8.33 A | 41.67 A | 1,200 W |
| 208 V | 4.81 A | 24.04 A | 2,080 W |
| 240 V | 4.17 A | 20.83 A | 2,400 W |
| 480 V | 2.08 A | 10.42 A | 4,800 W |
Frequently asked questions
Why does kVA to amps not use power factor?
kVA already measures apparent power, so current follows directly from kVA, voltage, and phase.
Why is three-phase current lower at the same kVA and voltage?
Balanced three-phase apparent power includes the square-root-of-three factor, which changes the line-current relationship.
Assumptions and limitations
- Balanced three-phase system assumed.
- No protection or conductor sizing.
Method and sources
Review the electrical formulas, calculation methodology, and reference tables for the references most relevant to this calculation. The broader technical sources index records source scope and verification. Last reviewed .