Enter a current in amps and the voltage (UK mains is 230 volts) and this converts amps to watts. Power in watts is simply current times voltage.
UK mains is a nominal 230 volts, so a device drawing 10 amps uses about 2,300 watts. This is the same relationship used for fuses and cabling: a standard 13A plug at 230V can carry up to roughly 3,000 watts. To go the other way, use the watts to amps calculator, and to turn watts into energy used, see watts to kWh.
Common questions
How do I convert amps to watts?
Multiply the current in amps by the voltage. At UK mains voltage of 230V, 10 amps is 10 times 230, which is 2,300 watts, or 2.3kW.
How many watts is 13 amps?
At 230 volts, 13 amps is about 2,990 watts, just under 3kW. That is why a standard 13A UK plug is the limit for high-power appliances like heaters and kettles.