kW to amps: kilowatts to amps at 230 V and 400 V
By Sithum Imarsha Last reviewed
7 kW at 230 V, power factor 1 works out at 30.43 A: 7 kW × 1,000 ÷ (230 V × 1) = 30.43 A.
Your result
Result
30.43 A
7 kW × 1,000 ÷ (230 V × 1) = 30.43 A
- You typed
- 7 kW at 230 V, power factor 1
- Apparent power (kVA)
- 7
- Power factor used
- 1
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Power point checkOver a 15 A power point's rating. Loads like this are usually hardwired on their own circuit. Ask a licensed electrician. An estimate, not electrical advice.
How we calculated this
- Multiply the volts by the power factor. Amps are the watts divided by that.
- On three phase, the volts are also multiplied by the square root of three before dividing.
- kW is kVA times power factor. An empty voltage means the standard at the meter.
Check the inputs
7 kW at 230 V, power factor 1
Use the formula
7 kW × 1,000 ÷ (230 V × 1) = 30.43 A
This version starts with a 7 kW load on single phase, like an EV wall charger. Type your kW, or switch to three phase.
kW to amps: what to know
Official source
- 1 kW draws 4.35 A at 230 V single phase and 1.44 A per phase at 400 V three phase. Schneider Electric's Electrical Installation Guide gives 4.35 A and 1.44 A.
- An induction cooktop such as the Westinghouse WHI633BC is rated 6,500 W: about 28.26 A at 230 V. Its maker lists it as a hardwired appliance. Ask a licensed electrician.
Estimate
- A 7 kW EV wall charger draws about 30.43 A at 230 V. Our own figure for a wall charger is 32 A at 230 V, which is 7.36 kW. Ask a licensed electrician.
| kW | 230 V single phase | 240 V (WA) | 400 V three phase |
|---|---|---|---|
| 1 | 4.35 A | 4.17 A | 1.44 A per phase |
| 1.5 | 6.52 A | 6.25 A | 2.17 A per phase |
| 2 | 8.70 A | 8.33 A | 2.89 A per phase |
| 2.4 | 10.43 A | 10.00 A | 3.46 A per phase |
| 3 | 13.04 A | 12.50 A | 4.33 A per phase |
| 3.6 | 15.65 A | 15.00 A | 5.20 A per phase |
| 5 | 21.74 A | 20.83 A | 7.22 A per phase |
| 7 | 30.43 A | 29.17 A | 10.10 A per phase |
| 7.5 | 32.61 A | 31.25 A | 10.83 A per phase |
| 10 | 43.48 A | 41.67 A | 14.43 A per phase |
| 15 | 65.22 A | 62.50 A | 21.65 A per phase |
| 22 | 95.65 A | 91.67 A | 31.75 A per phase |
- A standard power point is rated 10 A and the larger one 15 A, and everything on the same power point or power board shares that rating. In the 230 V single phase column, 2 kW draws 8.70 A, 3 kW draws 13.04 A and 3.6 kW draws 15.65 A. From 3.6 kW up the rows are more than either is rated for: loads like that are usually hardwired on their own circuit. Ask a licensed electrician.
- For the same kW, single phase draws 3.01 times the amps of each phase on 400 V three phase: 7 kW is 30.43 A at 230 V and 10.10 A per phase at 400 V.
- In WA, where the standard is 240 V, 7 kW draws 29.17 A: 1.26 A less than at 230 V.
Every cell is the calculator on this page, run for that row at power factor 1, the figure for a heater or kettle (Estimate). 230 V and 400 V are the standard at the meter in the eastern states and 240 V is the standard in WA (Official source). A standard power point is rated 10 A (Dated third-party source) and the larger one 15 A (Official source). Sources: Wikipedia, AS/NZS 3112: a standard socket-outlet is 230 V at a maximum of 10 A; WorkSafe Victoria safety alert (27 Mar 2012): 15 amp plug tops do not fit 10 amp socket-outlets (read via the Wayback Machine). An estimate, not electrical advice. Ask a licensed electrician.
Before you type a kW figure
An air conditioner's kW is not the kW it draws
The median 7.1 kW split on the Energy Rating registry has a rated cooling input of 2 kW, and the median 14 kW ducted system 4.18 kW.
Source: Energy Rating registry ac_2026_09_17.csv (data.gov.au), medians of deduplicated available models (Official source). Checked 1 October 2026.
The size in an air conditioner's name is the heat it moves, so type the rated input here, not the size. At power factor 1, the calculator's default, a rated input of 2 kW is 8.70 A at 230 V and 4.18 kW is 18.17 A. Both are amps at the rated input, not the most a unit can draw: our data holds no figure for that, and no power factor for an air conditioner. So neither figure says what power point or circuit a unit needs. Ask a licensed electrician. Typed as 7.1 kW, the split would read 30.87 A. What those sizes cost to run: the air conditioner running cost calculator.
For power points, power factor and 230 or 240 V, see the main watts to amps calculator.