Calculator InputLive calculation
kW to Amps at 120V Calculator
Pre-configured for single-phase AC circuits at 120V. Adjust values below.
Conversion Result
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Enter values to calculate
Formula Used
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Watts
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Milliamps
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Horsepower
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BTU/hr
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How kW to Amps at 120V Works
1
Enter the power in kilowatts (kW)
Common 120V loads range from 0.06 kW (60W bulb) to 1.8 kW (space heater at max). Most 120V circuits are limited to 15A or 20A breakers.
2
Voltage is fixed at 120V
120V is the standard US/Canada residential outlet voltage (NEMA 5-15R).
3
Enter the power factor
Use PF 1.0 for heaters, toasters, and incandescent lights. Use PF 0.6–0.8 for computers, LED drivers, and small motors.
4
Read the current in amps
Most US 120V circuits are protected by 15A or 20A breakers. The NEC limits continuous loads to 80% of the breaker rating.
kW to Amps at 120V Formula
120V Single-PhaseI = (kW × 1000) ÷ (120 × PF)
Standard formula for 120V AC circuits.
Quick MultiplierAmps ≈ kW × 8.33 (PF = 1)
At 120V PF 1.0, multiply kW by 8.33.
ReversekW = (I × 120 × PF) ÷ 1000
Convert amps to kW at 120V.
At 120 volts, 1 kW equals 8.33 amps at PF 1.0, or 10.42 amps at PF 0.8.
120V is the standard residential voltage in the United States, Canada, Mexico, and Japan. Most US outlets are on 15-amp or 20-amp circuits. The NEC 210.23 limits a single receptacle on a 15A circuit to a maximum load of 12 amps (80% rule for continuous loads). This means 120V circuits can safely handle up to 1.44 kW continuous at PF 1.0.
Frequently Asked Questions
1 kW at 120V equals 8.33 amps at PF 1.0. At PF 0.8, it equals 10.42 amps.
1500W at 120V draws 12.5 amps at PF 1.0. This is within a 15A breaker but exceeds the 80% continuous load rule (12A). Use a 20A circuit for continuous operation.
On a 15A circuit, the maximum continuous load is 1,440W (12A × 120V). On a 20A circuit, it is 1,920W (16A × 120V) per NEC 80% rule.
The US standard is 120V nominal. Older references say 110V or 115V. Actual voltage at the outlet typically ranges from 114V to 126V.