Electricity Cost Calculator
Find out exactly what any appliance is costing you to run. Enter the power rating, daily usage, and your electricity tariff rate to see the true cost.
How to Find Wattage
Check the label on the back or base of the appliance — wattage is usually printed there or in the manual. If listed in kilowatts (kW), multiply by 1000 for watts. A kettle is 2,000–3,000W. A fridge is 150–400W running average. An EV charger (7kW wallbox) is 7,000W.
UK Tariff Rates
The Ofgem price cap sets the unit rate each quarter. As of early 2025 the UK unit rate is around 24–28p/kWh. Check your energy bill's 'unit rate' line for your exact figure. Some tariffs have different day/night rates.
Biggest Energy Users at Home
Electric shower (9,500W), electric hob (2,000W per ring), tumble dryer (2,500W), dishwasher (1,200W per cycle), EV charger (7,000W). These items dominate most household energy bills — understanding their real cost helps prioritise savings.
Energy Efficiency Priorities
Home energy improvements should be prioritised by payback period. Quickest payback: draught proofing (£50-200 cost, saves £60-100/year — under 2 years). Loft insulation (£300-500 DIY, saves £150-200/year — 2-3 years). Switching to LED lighting (under £100, saves £40-60/year — under 2 years). Longer payback: cavity wall insulation (3-5 years). New efficient boiler (5-10 years). Solar panels (7-15 years). Heat pump (10-25 years at current energy prices). For homes eligible for ECO4 funding, the pa
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