A 3kW kettle boils one cup of water (235ml) in approx 45 seconds. This means it uses less than 1p (0.0093p) to boil a cup of water in a kettle. The same kettle can boil 1.7 litres of water in about 4 minutes, meaning that it costs around 5p (0.0497p) to boil a full kettle each time.
Under the January 2025 price cap, the average price for electricity is 24.86p/kW.
They say a watched kettle never boils, so click on the red button to start the kettle animation!