Appliance Energy Cost Calculator

Consumption (kWh) = power in watts ÷ 1,000 × hours of use. For the cost: kWh × price per kWh. E.g.: a 2,000 W oven used 1 hour a day uses 2 kWh; at €0.28/kWh that is about €0.56 a day. The power rating is on the appliance label or in its manual.

The kilowatt-hour (kWh) is the unit used to measure electricity on your bill. It equals the energy used by a 1,000 W (1 kW) device running for one hour. So a 100 W device on for 10 hours uses 1 kWh. It is the figure you multiply by the price (€/kWh) to get the cost.

The heaviest users are those that generate heat or cold: tumble dryer, oven, electric water heater, air conditioner, washing machine and dishwasher (for heating the water). The fridge has low power but runs all the time, so over a year it adds up. Hairdryers and irons have high power but short use.

A modern class A fridge uses about 150-300 kWh a year; old models or large fridge-freezers can reach 400-500 kWh. At €0.28/kWh that is roughly €40-140 a year. Keep it away from heat sources and at 4-5°C to keep consumption down.

Devices left on standby (TVs, set-top boxes, consoles, power supplies, microwaves with a display) keep drawing power even when off: estimates suggest they can account for 5-10% of the annual electricity bill. Switching them off completely with a switched power strip is the easiest way to cut this waste.

For appliances used often or always on (fridge, freezer, washing machine, tumble dryer) yes: class A uses far less, and the higher purchase price pays off over time through a lower bill, especially when replacing a 10+ year-old model. For rarely used appliances the impact is smaller.

The European energy label rates appliances from A (most efficient) to G (least efficient), with a colour scale from green to red. It also shows the annual or per-cycle consumption in kWh, plus data such as capacity, noise and water use. To compare two models look at the class and especially the stated kWh consumption: that figure translates directly into your bill.

The wattage is multiplied by the hours of use and divided by a thousand, which gives kWh. Multiplying the kWh by your price per kWh gives what it adds to the bill.

The wattage is printed on the rating plate of the appliance. The calculator starts from typical values anyway, for fridge, air conditioner, oven, washing machine, tumble dryer and dishwasher.

The price per kWh is on your bill, under the energy supply line. The calculator offers 0.20, 0.28 and 0.35 euro as starting points, and then the figure should be matched to your own contract.

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