Watts to Amps Calculator
Convert watts to amps at a given voltage.
Current
13.04A
- In kilowatts
- 3 kW
v1.0 · Reviewed September 2026
How this is worked out
Current in amps is power in watts ÷ supply voltage, so a 3,000 W appliance on a 230 V UK supply draws about 13 A. This is the figure a plug fuse or circuit rating has to cover.
Worked example
- 3,000 W
- 230 V
3,000 ÷ 230
13.04 A
Assumptions and limits
- Applies to direct current or to alternating current at unity power factor, which is fine for heaters, kettles and filament lighting.
- Motors, transformers and some electronics have a power factor below 1 and draw more current than this suggests.
- UK nominal supply voltage is 230 V, with a permitted range from 216.2 V to 253 V, so real current varies a little.