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WattWorth

What will it cost to run?

Calculators for the energy questions that end up on a bill: running an appliance, charging a car, heating with a heat pump, solar panels and backup batteries. Each one shows how it worked its numbers out.

2.000 kilowatt-hours

A 2,000 W heater running for one hour uses 2 kWh: watts × hours ÷ 1,000. Every calculator here starts from that line.

Calculators

Explore appliance running costs: space heater, oil-filled radiator, heated towel rail, electric blanket, window air conditioner, ceiling fan, window fan, kettle, toaster, toaster oven, microwave oven, electric oven, electric hob, electric grill, coffee maker, induction hob, cooker hood, dishwasher, compact dishwasher, fridge freezer, fridge, mini fridge, drinks cooler, chest freezer, upright freezer, washing machine, tumble dryer, condenser tumble dryer, clothes iron, led or lcd tv, oled tv, computer monitor, desktop computer, laptop, games console, tv box, dvd player, wi-fi router, led downlight, electric shower, immersion heater, electric water heater, hair dryer, vacuum cleaner, dehumidifier, electric lawn mower, extractor fan, air purifier.

Your prices

Every calculator uses these. They are saved on this device and nowhere else.

Pick where you live for your local prices.

Electricity

Default Ofgem, 1 Oct – 31 Dec 2026.

Default Ofgem, 1 Oct – 31 Dec 2026.

Gas

Default Ofgem, 1 Oct – 31 Dec 2026.

Default Ofgem, 1 Oct – 31 Dec 2026.