PennyPerHourAppliance running cost calculator (UK)
Enter an appliance's wattage and how long you use it to see the cost per hour, day, month and year at UK electricity prices.
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Default price is the Ofgem cap for 1 October to 31 December 2026. Check your bill for your exact unit rate. Figures exclude standing charges.
Where do I find the wattage?
Look on the rating plate or sticker on the back or underside of the appliance, on the plug, or in the manual. It's shown in watts (W) or kilowatts (kW): 1kW = 1,000W.
Why might my real cost be lower?
Appliances with thermostats, like heaters, ovens, fridges and dehumidifiers, switch on and off to hold a temperature or humidity level. They only draw full power part of the time, so the figures above are a maximum.
Detailed guides
LaundryHow much does a heated airer cost to run?
A typical 220W heated airer costs about 5.8p an hour at the current UK price cap. See costs per load, versus a tumble dryer, and how to dry faster.
HeatingHow much does an electric blanket cost to run?
A double electric blanket costs around 2.6p an hour on high and less on low. Compare it with a heater and central heating at today's UK price cap.
Damp & mouldHow much does a dehumidifier cost to run?
Compressor dehumidifiers cost about 5.3p an hour and desiccant models around 13p. Find out which type suits a cold UK home and how much a month costs.
KitchenAir fryer vs oven: which costs less to run?
A 20-minute air fryer cook costs about 9.2p versus roughly 32p for an electric oven. Full UK cost comparison including microwave and slow cooker.
HeatingWhat's the cheapest electric heater to run?
Running costs for oil-filled radiators, fan, halogen, convector and infrared heaters at 26.32p/kWh, plus when electric heating beats central heating.
HeatingIs a smart thermostat worth it?
How much a smart thermostat could save on a UK gas bill, how long it takes to pay back, and which features actually make a difference.
KitchenHow much does a coffee machine cost to run?
Electricity cost per cup for pod, bean-to-cup, espresso and filter coffee machines at 26.32p/kWh, plus why leaving a machine switched on costs more than brewing.
KitchenHow much does a slushie machine cost to run?
A home frozen-drink maker uses around 0.08kWh to freeze a batch, about 2.1p. See the cost of keeping it running, plus ice cream makers and blenders compared.
Cooling