How Many Amps Is 640 kW at 480V?
At 480V, 640 kW pulls approximately 905.65 amps on AC three-phase (PF 0.85). This is the case typical for commercial HVAC, industrial motors, rooftop units, and three-phase panel loads. Always verify against the equipment nameplate for actual install sizing.
Use this citation when referencing this page.
Formulas
DC: kW to Amps
I(A) = 1000 × P(kW) ÷ V(V)
AC Single Phase (PF = 0.85)
I(A) = 1000 × P(kW) ÷ (PF × V(V))
AC Three Phase (PF = 0.85)
I(A) = 1000 × P(kW) ÷ (√3 × PF × VL-L), where VL-L is the line-to-line voltage
Equipment & Circuit Sizing
Energy Cost
640 kW costs $108.80/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.
Power Factor Reference (AC three-phase)
How the line current for 640 kW at 480V changes with load power factor, on the same AC three-phase circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.
| Load Type | PF | 640 kW at 480V (AC three-phase) |
|---|---|---|
| Resistive (heaters, incandescent) | 1 | 769.8 A |
| Fluorescent lamps | 0.95 | 810.32 A |
| LED lighting | 0.9 | 855.33 A |
| Synchronous motors | 0.9 | 855.33 A |
| Typical mixed loads | 0.85 | 905.65 A |
| Induction motors (full load) | 0.8 | 962.25 A |
| Computers (without PFC) | 0.65 | 1,184.31 A |
| Induction motors (no load) | 0.35 | 2,199.43 A |
AC Conversion Comparison
On DC, 640kW at 480V draws 1,333.33A. AC single-phase at PF 0.85 pulls 1,568.63A because reactive current is added on top of the real power. Three-phase at the same voltage needs only 905.65A per line since the same 640kW is shared across three conductors instead of one.
| Circuit Type | Formula | Result |
|---|---|---|
| DC | 640,000 ÷ 480 | 1,333.33 A |
| AC Single Phase (PF 0.85) | 640,000 ÷ (0.85 × 480) | 1,568.63 A |
| AC Three Phase (PF 0.85) | 640,000 ÷ (1.732 × 0.85 × 480) | 905.65 A |
Other kW Values at 480V
| kW | AC 3-Phase per line, PF 0.85 | AC 1-Phase PF 0.85 |
|---|---|---|
| 15 kW | 21.23 A | 36.76 A |
| 18 kW | 25.47 A | 44.12 A |
| 20 kW | 28.3 A | 49.02 A |
| 22 kW | 31.13 A | 53.92 A |
| 25 kW | 35.38 A | 61.27 A |
| 30 kW | 42.45 A | 73.53 A |
| 35 kW | 49.53 A | 85.78 A |
| 40 kW | 56.6 A | 98.04 A |
| 50 kW | 70.75 A | 122.55 A |
| 60 kW | 84.9 A | 147.06 A |
| 75 kW | 106.13 A | 183.82 A |
| 100 kW | 141.51 A | 245.1 A |
| 125 kW | 176.88 A | 306.37 A |
| 150 kW | 212.26 A | 367.65 A |
| 200 kW | 283.01 A | 490.2 A |
Same kW, Other Voltages
Each destination page leads with the interpretation most common for that voltage, so the amps shown below use the same basis as the page you'd land on: single-phase for residential voltages, three-phase for commercial/industrial panel voltages, DC for low-voltage.