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Electricity consumption calculator

Calculate an appliance’s daily, monthly and annual kWh and cost from its power and real usage.

✓ Monthly and annual cost✓ Load factor✓ Copyable summary
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Power, usage and tariff

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Indicative diagram of this calculator inputs
Cost depends on real power draw, usage time and the price per kWh.

How electricity consumption is calculated

We divide watts by 1,000 to get kW, multiply by hours of use and the load factor, then apply the price per kWh.

W ÷ 1,000 × hours × load factor × price per kWh

Rated power and real consumption

Many appliances do not run at full power all the time. Refrigerators, water heaters and climate equipment cycle or modulate, so the load factor improves the estimate.

How to compare two models

Calculate each appliance separately and combine annual running cost with purchase price, maintenance and expected life.

Worked example and limitations

A 1,000 W appliance used two hours per day for 30 days theoretically consumes 60 kWh. At an assumed energy rate of €0.20/kWh, this is €12 excluding standing charges and taxes. Thermostats and duty cycles affect real usage.