Your price per kWh is on your electricity bill (energy, grid and levies together). The power of an appliance is on its label; a plug-in meter measures it exactly.
What an appliance costs in electricity
An appliance uses its power (in watts) for the hours it runs. Watts × hours ÷ 1000 gives kilowatt-hours (kWh), and kWh × your price per kWh gives the cost.
Many appliances also draw a little power on standby the rest of the day: a few watts, but every hour of the year. The calculator counts both and shows what standby alone costs.
Where the figures come from
Power: on the appliance's label or manual, or measured with a plug-in meter.
Price per kWh: on your electricity bill, energy, grid and levies together.
Fridges and freezers cycle on and off: use their yearly kWh from the energy label instead.
Frequently asked questions
How do I use the energy label?
For fridges, washing machines or TVs the label gives kWh per year or per 100 cycles. To use it here, enter the yearly kWh × 1000 ÷ 8760 as the power (the average watts) and 24 hours a day.
Is standby worth worrying about?
A few watts around the clock add up to tens of kWh a year per device. A power strip with a switch removes it.
Why is my bill higher than the sum?
Heating, hot water and cooking usually dominate, and the bill adds fixed fees. The calculator shows one appliance at a time.
Indicative results. This is not financial advice.
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