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Energy

How much electricity does my air conditioner use?

Estimate the daily, monthly and seasonal energy use and cost of running your air conditioner.

Calculator

Enter the details from the appliance label or technical specifications.

h
days
€/kWh

Find the price per kWh on your electricity bill.

Result

Daily usage20 kWh
Daily cost€4.00
Monthly usage600 kWh
Monthly cost€120.00
Cost over 3 months€360.00

Using it one hour less per day would save €15.00 per month.

Using it two hours less per day would save €30.00 per month.

How it works

  1. Enter the electrical power and choose W or kW.
  2. Enter the hours used per day and days per month.
  3. Add the price you pay for each kWh.
  4. Review energy use, cost and potential savings from shorter use.

Practical example

A 2,500 W unit used 8 hours a day for 30 days at €0.20/kWh would use 600 kWh per month and cost approximately €120.

Formula and explanation

First, watts are converted to kilowatts by dividing by 1,000. The result is then multiplied by running time.

Monthly usage = power in kW × hours per day × days per month. Cost is usage multiplied by the price per kWh.

The estimate assumes constant power. An inverter system may modulate its output and use less in practice.

Frequently asked questions

Is rated power the same as actual usage?

Not always. Rated power is a reference; inverter units adjust their output as the room reaches the target temperature.

Where can I find the power rating?

Check the label, manual or technical data sheet. Use electrical input in W or kW, not cooling capacity in BTU.

Which kWh price should I use?

Use the energy price on your bill, or an average if your tariff changes by time of day.

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