What is a Watt (W) - Household appliances and devices

A watt (W) it is a unit used to measure power.

A Watt it is the amount of energy that our household appliances and devices need to function, the rate at which they consume energy.

One watt is the equivalent to electricity flowing at a rate of one joule per second.

For example, a light bulb rated at 60 W will need that much amount of power to be able to produce a predetermined amount of light (lumens).

Bulb lumens table

The following video explains what a watt is and how it is related to other power measurement units and our household appliances and devices. Do not forget to enable the video captions, as the video caption contains the concepts explanations.

Electricity usage and cost calculator

This calculator can be used to:

– Convert Watts (W) to Kilowatts (kW) 

kW = W/1000

– Convert Watts (W) to Kilowatt Hours (kWh)

kWh = (W/1000) x Hours

kWh is the measurement unit used by the electricity suppliers to calculate our electricity bills. 

Also, most of the big appliances, like the dishwashers or washing machines, rate their consumption in kWh.


A few other examples from our ‘Electricity usage calculators‘ page that may be of your interest:

Fridge electricity usage calculator
Freezer electricity usage calculator
Dishwasher electricity usage calculator
Coffee machine electricity usage calculator
Coffee machine

Additional information

A very practical way to find out how many watts, kilowatts or kilowatt hours of electricity do our household appliances use, it is to use a plug in power meter.

A plug in power meter do also measure the exact electricity cost over time so this device can be used to find out how much you are paying and find any appliance or device which may be wasting electricity.

All our videos can be found in YouTube, in both English and Spanish languages.

If you are looking for saving electricity at home, have a look to this video where we provide some useful tips to reduce the electricity consumption and decrease the electricity bill.

Electricity conservation - Save and conserve energy

Energy conservation can be defined as the decision and the act of using less energy

Energy conservation both benefit you and the environment

The act of saving and conserving electricity does benefit you because you will be paying less on your energy bills. 

And it also does benefit the environment because conserving electricity prevents any unnecessary waste of natural resources.

Now, at individual level it may not look worth to try to save a few watts here or there. 

Still, every little counts and if hundreds or thousands of us do save a little every time, it will make an important contribution towards conserving our natural resources.


For example, if 9000 households would manage to save as little as 10 Watts per hour (0,01 kWh) worth of electricity per day, that would add to 32850 Kilowatt hour (kWh) per year. 

That is a considerable amount of electricity, but let’s add additional perspectives for clarity:

  • Assuming an average cost of 0,18 euro (or dollars, or pounds, or any other currency) we would collectively be saving nearly 6000 euro per year.
  •  To produce 32850 kWh of electricity it is necessary to use around 17 metric tons of coal or 56 barrels of residual fuel oil.
Have a look to this page for more information about the amount of resources needed to produce electricity.

In any case it is clear that small energy savings do really count when looking into the bigger picture.

We hope that you have found the information on this page informative and of value. 

If so, please consider to share or subscribe to our newsletter.

We dedicate a considerable amount of time and effort to create content and your support and engagement will encourage us to keep moving forward.

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Effiworkx blog

For more useful energy and water saving information and advice, have a look to our blog.

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