Calculate the electricity cost of any appliance based on wattage and usage time.
An electricity bill calculator estimates the cost of running any electrical appliance based on its wattage, daily usage hours and your electricity tariff rate. It helps you identify energy-hungry appliances, understand your electricity bill and find ways to reduce your energy consumption and save money.
Calculate the running cost of every appliance in your home to identify the biggest energy consumers.
Compare energy costs between old and new appliances to calculate how long it takes for an efficient model to pay for itself.
Identify which habits (e.g. leaving devices on standby) are costing the most and how much you could save.
Calculate your current energy costs to determine whether installing solar panels would be financially worthwhile.
Cost = (Wattage ÷ 1000) × Hours Used × Electricity Rate. For example, a 2000W kettle used 0.1 hours/day at 28p/kWh = 0.2 kWh × £0.28 = £0.056/day.
A kilowatt-hour (kWh) is the unit used to measure electricity consumption. It equals using 1,000 watts of power for 1 hour — for example, running a 1kW heater for 1 hour.
As of 2024/25, the UK unit rate under the energy price cap is approximately 24–28 pence per kWh, though this varies by region, tariff and energy provider.
Electric showers (8–10kW), electric ovens (2–2.5kW), tumble dryers (2–3kW) and electric heaters (1–3kW) are typically the most expensive to run.