Appliances on this circuit
BS 7671 ring final circuits: why a UK socket circuit is different
Most UK homes wire socket outlets as a ring final circuit protected by a 32A breaker, where current can flow both ways around the ring, effectively sharing the load across two conductor paths. This is different from the simple radial circuit this calculator assumes, and it is why a single UK ring circuit can safely serve many more sockets than a US or continental European radial circuit of similar breaker rating. High-draw appliances like kettles (around 3 kW) and electric showers (7-10 kW) are still normally given their own dedicated radial circuit.
Kitchen appliances and the UK's high-wattage kettle culture
UK kettles are unusually powerful by international standards, commonly 2.8-3 kW, because the 230V/13A supply and BS 1363 plug allow it, whereas 120V countries cap kettles at a much lower wattage for the same current draw. If you are checking a kitchen ring circuit's load, remember several kettles, toasters, and a microwave running together briefly can spike well above the steady-state figure this calculator gives.