What is a Kilowatt Hour (kWh)?

Learn what a Kilowatt Hour (kWh) is

The Kilowatt Hour (kWh) it is the unit of measurement used to measure electricity consumption. Therefore, for anyone really interested in knowing how much electricity it is being used at home and what electricity cost is, to know what a Kilowatt Hour is it is a must.

As shown in the picture below, this household is using an average of 2700 kWh per year and it is being charged 0,2173 euro per kWh. Multiplying the 2700 kWh by 0,2173 per kWh gives us an electricity variable cost of approximately 600 euro per year. 

Our home electricity consumption in kWh

One Kilowatt (kW) it is the equivalent to 1000 Watts (W) so, for example, if we have a 60 Watts bulb and we want to find the equivalent in Kilowatt we just need to divide 60 by 1000 and that gives us a power consumption of 0,06 Kilowatts.

60 W /1000 = 0,06 kWh

If we want to know the Kilowatts hour are used by that bulb over a period of 10 hours we just need to multiply 0,06 by 10 and that gives us a total of 0,6 Kilowatt Hours (kWh)

0,06 kWh x 10 hours = 0,6 kWh

Kilowatt Hour consumption calculators

The calculator below can be used to find out the kWh consumption based on power (Watts) usage over time (Hours).

For example, calculate your PC monitor energy consumption. Have a look to the back of the monitor for the label that shows the consumption in Watts and estimate how many hours a day the monitor stays on.


Based on the same basic principles, the calculator below can be used to not only calculate how many kWh are consumed by an appliance or device over time but also to find out the electricity costs based on the price per kWh.

For example:

  • Calculate how much power your office illumination is consuming over time (every day and the whole year) and the cost
  • Calculate how much power you television set  or your gaming console s consuming over time and the cost
  • Calculate how much power your fridge is consuming over time and the cost
  • Calculate how much power your air consitioning machine is consuming over time and the cost 

For other useful calculators have a look to the electricity consumption calculators page.

By knowing what a kilowatt hour is and that your electricity company is charging your based on how many kWh hours you are consuming, you can start monitoring your energy consumption and find out how you can decrease it. 

Be aware that any electricity waste, even if it is small, it will accumulate over time up to considerable amounts and drain your pockets without you to realize about it.

Watt (W), Kilowatt (kW), and Kilowatt Hour (kWh) relationship

For those who are interested on some additional knowledge about this topic, have a look to the video below from the Youtube Effiworkx channel.

In this video we are explaining how Watts (W), Kilowatts (kW) and Kilowatt Hours (kWh) are related and how this knowledge translates into useful applications like deciding if purchasing a more energy efficient appliance it is really cst effective.

We are working towards make the videos available in many languages so if English is not your main language have a look to the channel for other language options.

Reduce your electricity consumption

Now that you know what a Kilowatt Hour is, if you are interested on learning how to reduce your electricity consumption and save money, click on the image below and have a look to our electricity efficiency page.

We trust that the information shared if it of interest for anyone who is interested in becoming aware of how much electricity it is being consumed by our appliance and devices and what are the best energy saving opportunities that we can apply to reduce our electricity consumption and save money.

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