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Electricity consumption

Estimate energy used (kWh) and total running cost (€) from a device power in watts. All calculations run locally in your browser.

Enter device power and usage time. The calculator outputs:

  • Energy used in kWh
  • Total cost in €
  • Daily / monthly / yearly estimates

Device consumption in watts.
Average daily usage time.
Your tariff price per kWh.

How the electricity cost is calculated

We convert watts to kilowatt-hours using: kWh = (W ÷ 1000) × hours. Then the cost is: cost = kWh × price per kWh.

Monthly and yearly values are estimates based on 30 and 365 days. For a more precise result, use your real billing period.

Formula: kWh = (W / 1000) × hours. Monthly = daily × 30, yearly = daily × 365 (approx).