How Many Amps Is 12 kW at 208V?

At 208V, 12 kW pulls approximately 39.19 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.

12 kW at 208V, AC three-phase (PF 0.85)

39.19 Amps

12 kilowatts at 208V on AC three-phase ≈ 39.19 amps

AC Single Phase (PF 0.85)67.87 A

DC (ideal baseline)57.69 A

Try: 10kW at 208V 15kW at 208V 8kW at 208V 7.5kW at 208V

Volts

Amps (AC three-phase, PF 0.85)

39.19

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 12 ÷ 208 = 12,000 ÷ 208 = 57.69 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

12,000 ÷ (0.85 × 208) = 12,000 ÷ 176.8 = 67.87 A

AC Three Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (√3 × PF × V_L-L), where V_L-L is the line-to-line voltage

12,000 ÷ (1.732 × 0.85 × 208) = 12,000 ÷ 306.22 = 39.19 A

Equipment & Circuit Sizing

Breaker Sizing

Breaker ratings are in amps, not watts, so the real install answer depends on the equipment nameplate FLA, whether the load is continuous (NEC 210.19(A) sizes the conductor and OCP at 125% of a continuous load, equivalently 80% of breaker rating), conductor ampacity and temperature rating, ambient and bundling derates, and any motor or HVAC provisions (NEC 430 / 440). At roughly 39.19A on AC three-phase at 208V, the load sits in the bracket between a 40A standard size (non-continuous) and the next size up that covers a continuous load under 210.19(A) (around 50A). The actual install pick depends on whether the load is continuous and the factors above; a conversion page can't pick a single "right" breaker from the amp draw alone.

Energy Cost

12 kW costs $2.04/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (AC three-phase)

How the line current for 12 kW at 208V 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	12 kW at 208V (AC three-phase)
Resistive (heaters, incandescent)	1	33.31 A
Fluorescent lamps	0.95	35.06 A
LED lighting	0.9	37.01 A
Synchronous motors	0.9	37.01 A
Typical mixed loads	0.85	39.19 A
Induction motors (full load)	0.8	41.64 A
Computers (without PFC)	0.65	51.24 A
Induction motors (no load)	0.35	95.17 A

AC Conversion Comparison

On DC, 12kW at 208V draws 57.69A. AC single-phase at PF 0.85 pulls 67.87A because reactive current is added on top of the real power. Three-phase at the same voltage needs only 39.19A per line since the same 12kW is shared across three conductors instead of one.

Circuit Type	Formula	Result
DC	12,000 ÷ 208	57.69 A
AC Single Phase (PF 0.85)	12,000 ÷ (0.85 × 208)	67.87 A
AC Three Phase (PF 0.85)	12,000 ÷ (1.732 × 0.85 × 208)	39.19 A

Other kW Values at 208V

kW	AC 3-Phase per line, PF 0.85	AC 1-Phase PF 0.85
2 kW	6.53 A	11.31 A
2.5 kW	8.16 A	14.14 A
3 kW	9.8 A	16.97 A
3.5 kW	11.43 A	19.8 A
4 kW	13.06 A	22.62 A
5 kW	16.33 A	28.28 A
6 kW	19.59 A	33.94 A
7.5 kW	24.49 A	42.42 A
8 kW	26.12 A	45.25 A
10 kW	32.66 A	56.56 A
12 kW	39.19 A	67.87 A
15 kW	48.98 A	84.84 A
18 kW	58.78 A	101.81 A
20 kW	65.31 A	113.12 A
22 kW	71.84 A	124.43 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.

Related Calculations

bolt 12,000W to amps at 208V payments 12,000W running cost cable Wire size for 39.19A at 208V (3Φ)

Frequently Asked Questions

How many amps is 12 kW at 208V?expand_more

12 kW at 208V draws about 39.19 amps on an AC three-phase circuit at PF 0.85. Alternate cases at the same voltage: 57.69A on DC, 67.87A on AC single-phase.

How does three-phase affect the amps for 12 kW?expand_more

Three-phase at 208V draws 39.19A per line versus 67.87A single-phase. Less current per conductor means smaller wire and lower I²R losses.

What is the formula for kW to amps?expand_more

DC: Amps = (kW × 1000) ÷ Volts. AC single-phase: Amps = (kW × 1000) ÷ (Volts × PF). AC three-phase: Amps = (kW × 1000) ÷ (Volts_L-L × √3 × PF).

How much does 12 kW cost to run?expand_more

12 kW costs $2.04 per hour at $0.17/kWh (US residential average, last reviewed April 2026). At 8 hours/day that is $489.60 per month.

How many amps does a 12 kW EV charger draw at 208V?expand_more

At 208V, a 12 kW EVSE draws about 67.87A on AC single-phase at PF 0.85. This is Level 2 territory, the standard residential (240V) or commercial (208V) AC charging tier covered by NEC Article 625. Home Level 2 units are typically 7.2 to 19.2 kW (30-80A); anything above that is usually commercial hardware or DC fast charging. Although the hero on this page shows the three-phase figure for 208V as the primary interpretation, real-world 208V commercial Level 2 EVSE is almost always wired single-phase across two wye legs, so the single-phase number above is the one a charger installer would use.

This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.