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kW to Amps at 240V Calculator
Pre-configured for single-phase AC circuits at 240V. 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 240V Works
1
Enter the power in kilowatts (kW)
Check the appliance nameplate or documentation for the kW rating. Common 240V appliances include dryers, ovens, water heaters, and HVAC units.
2
Select the circuit type
Most US 240V residential circuits are single-phase AC. Select DC only for battery or solar systems operating at 240V.
3
Enter the power factor (PF)
Use PF 1.0 for resistive loads like heaters and ovens. Use PF 0.8 for motors and compressors.
4
Read the current in amps
Use this value to select the correct wire gauge and circuit breaker size per NEC requirements.
kW to Amps at 240V Formula
240V DCI = (kW × 1000) ÷ 240
For DC circuits at 240V. Simple division of watts by voltage.
240V Single-Phase ACI = (kW × 1000) ÷ (240 × PF)
For AC circuits. Includes power factor in the denominator.
Quick MultiplierAmps ≈ kW × 4.17 (DC)
At 240V DC, multiply kW by 4.17 for a quick estimate.
At 240 volts, 1 kW equals 4.17 amps on a DC circuit. On single-phase AC with PF 0.8, 1 kW equals 5.21 amps.
240V is the standard voltage for large US residential appliances. The NEC specifies that circuits for appliances rated above 1,500 watts typically require 240V wiring with appropriate breaker sizing. An electric dryer rated at 5.4 kW on a 240V circuit draws 22.50 amps (DC equivalent) or 28.13 amps at PF 0.8.
Frequently Asked Questions
1 kW at 240V equals 4.17 amps on DC. On single-phase AC with PF 0.8, it equals 5.21 amps.
3 kW at 240V equals 12.50 amps on DC. On single-phase AC with PF 0.8, it equals 15.63 amps.
Electric dryers, ranges, ovens, water heaters, central AC units, heat pumps, and welding machines commonly use 240V circuits in US residential installations.
Yes. 240V circuits use a double-pole breaker that spans two bus bar positions in the electrical panel. The breaker rating must match or exceed the calculated amp draw.
In the US, the nominal voltage has been standardized to 240V, but older references may say 220V. In practice, the actual voltage at the outlet typically ranges from 228V to 252V.