kW to Amps Single Phase Converter
Work out the current in amps for any single phase load from its power in kW, watts or horsepower, with adjustable voltage, power factor and efficiency.
Convert kW to Amps
Enter the power of your appliance or motor, the supply voltage and the power factor. The converter returns the current drawn, the apparent power in kVA and the next standard breaker size up.
kW to Amps Calculator
Single phase current from power, volts and power factor.
How kW Converts to Amps
The formula and the inputs that matter
The Formula
Amps = (kW × 1000) ÷ (volts × power factor). For 7 kW at 230 V and a power factor of 1, that is 7000 ÷ 230 = 30.4 A.
Use the Right Voltage
Lower voltage means higher current for the same power. A 3 kW load draws 13 A at 230 V but 25 A at 120 V.
Power Factor and Efficiency
Motors and some electronics draw more current than their power alone suggests. A lower power factor or efficiency raises the amps.
Leave Headroom
Breakers and cables are chosen above the load current. For loads that run for hours, such as EV chargers, a 25% margin is common practice.
kW to Amps Single Phase Chart
Current drawn by common loads with a power factor of 1. Values are rounded to two decimal places.
Common Loads at 230 V and 240 V
| Power | Amps at 230 V | Amps at 240 V | Typical Example |
|---|---|---|---|
| 4.35 A | 4.17 A | Small heater, vacuum cleaner | |
| 8.70 A | 8.33 A | Fan heater, dishwasher | |
| 13.04 A | 12.50 A | Kettle, 13 A plug limit | |
| 21.74 A | 20.83 A | Electric oven and hob | |
| 30.43 A | 29.17 A | Home EV charger (nominal) | |
| 32.17 A | 30.83 A | 32 A EV charger | |
| 41.30 A | 39.58 A | Electric shower | |
| 45.65 A | 43.75 A | High-power electric shower |
Typical Power Factors
| Load Type | Typical Power Factor | Notes |
|---|---|---|
| Heaters, kettles, ovens | 1.0 | Purely resistive loads |
| Modern electronics | 0.9 to 0.95 | Power supplies with correction |
| LED lighting | 0.9 | Varies by driver quality |
| Induction motors | 0.8 to 0.85 | Pumps, compressors and fans under load |
| Lightly loaded motors | 0.6 to 0.7 | Power factor falls when a motor is underloaded |
kW to Amps FAQ
Answers to the most common questions about converting kW to amps.
Use the formula amps = (kW × 1000) ÷ (volts × power factor). For a 3 kW resistive load on 230 V with a power factor of 1, the current is 3000 ÷ 230 = 13.04 amps.
7 kW at 230 V with a power factor of 1 draws about 30.4 amps. A 7.4 kW home EV charger draws about 32 amps, so it normally needs its own dedicated circuit.
Use 1 for resistive loads such as heaters, kettles, ovens and immersion heaters. For induction motors, 0.8 is a common estimate if you do not have the nameplate value. Always use the figure on the equipment label when it is available.
On a single phase supply, amps = watts ÷ (volts × power factor). On a three phase supply the voltage term is multiplied by the square root of 3, so the same power draws roughly 58% of the current per phase at the same line voltage.
Convert horsepower to kW by multiplying by 0.7457, then divide by the motor’s efficiency to get input power, and use the amps formula. A 1 hp motor at 230 V, a power factor of 0.8 and 85% efficiency draws about 4.8 amps.