Amps to Watts Calculator
Convert amps to watts at a given voltage.
Power
2,990W
- In kilowatts
- 2.99 kW
v1.0 · Reviewed September 2026
How this is worked out
Power in watts is current in amps × supply voltage, so a 13 A load on a 230 V UK supply is close to 3,000 W. That wattage is what an energy bill is charged on.
Worked example
- 13 A
- 230 V
13 × 230
2,990 W
Assumptions and limits
- Assumes unity power factor, so it suits resistive loads such as heating and hot water.
- 13 A at 230 V is the ceiling for a standard UK plug, which is why appliances are rated at around 3 kW at most.