How Many Amps Is 5.5 kW at 120V?

At 120V, 5.5 kW pulls approximately 53.92 amps on AC single-phase (PF 0.85). This is the case typical for residential water heaters, dryers, ranges, EV chargers, and HVAC equipment. Always verify against the equipment nameplate for actual install sizing.

5.5 kW at 120V, AC single-phase (PF 0.85)

53.92 Amps

5.5 kilowatts at 120V on AC single-phase ≈ 53.92 amps

DC (ideal baseline)45.83 A

Try: 5kW at 120V 6kW at 120V 4kW at 120V 3.5kW at 120V

Volts

Amps (AC single-phase, PF 0.85)

53.92

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 5.5 ÷ 120 = 5,500 ÷ 120 = 45.83 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

5,500 ÷ (0.85 × 120) = 5,500 ÷ 102 = 53.92 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 53.92A on AC single-phase at 120V, the load sits in the bracket between a 60A standard size (non-continuous) and the next size up that covers a continuous load under 210.19(A) (around 70A). 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

5.5 kW costs $0.94/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (AC single-phase)

How the line current for 5.5 kW at 120V changes with load power factor, on the same AC single-phase circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.

Load Type	PF	5.5 kW at 120V (AC single-phase)
Resistive (heaters, incandescent)	1	45.83 A
Fluorescent lamps	0.95	48.25 A
LED lighting	0.9	50.93 A
Synchronous motors	0.9	50.93 A
Typical mixed loads	0.85	53.92 A
Induction motors (full load)	0.8	57.29 A
Computers (without PFC)	0.65	70.51 A
Induction motors (no load)	0.35	130.95 A

AC Conversion Comparison

On DC, 5.5kW at 120V draws 45.83A. AC single-phase at PF 0.85 pulls 53.92A because reactive current is added on top of the real power.

Circuit Type	Formula	Result
DC	5,500 ÷ 120	45.83 A
AC Single Phase (PF 0.85)	5,500 ÷ (0.85 × 120)	53.92 A

Other kW Values at 120V

kW	AC 1-Phase PF 0.85	DC Amps PF 1.0 baseline
0.5 kW	4.9 A	4.17 A
0.75 kW	7.35 A	6.25 A
1 kW	9.8 A	8.33 A
1.5 kW	14.71 A	12.5 A
2 kW	19.61 A	16.67 A
2.5 kW	24.51 A	20.83 A
3 kW	29.41 A	25 A
3.5 kW	34.31 A	29.17 A
4 kW	39.22 A	33.33 A
5 kW	49.02 A	41.67 A
6 kW	58.82 A	50 A
7.5 kW	73.53 A	62.5 A
8 kW	78.43 A	66.67 A
10 kW	98.04 A	83.33 A
12 kW	117.65 A	100 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 5,500W to amps at 120V payments 5,500W running cost cable Wire size for 53.92A

Frequently Asked Questions

How many amps is 5.5 kW at 120V?expand_more

5.5 kW at 120V draws about 53.92 amps on an AC single-phase circuit at PF 0.85. Alternate cases at the same voltage: 45.83A on DC.

Why do industrial systems use kW instead of watts?expand_more

Industrial equipment operates at higher power levels. 5.5 kW is easier to express than 5,500W. The math is identical, just scaled by 1000.

Is 5.5 kW single-phase or three-phase?expand_more

5.5 kW is available in both, but three-phase is more common for commercial HVAC, rooftop units, and motors once you reach this range.

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 does power factor affect the amps for 5.5 kW at 120V?expand_more

On AC single-phase, current scales inversely with power factor. At PF 1.0 (pure resistive, like a heater), 5.5 kW at 120V draws 45.83A. At PF 0.80 (typical induction motor), the same real power draws 57.29A. The extra current is reactive and does no real work, but still flows through the wire and the breaker.

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.