- How much electricity does a laptop use? -

A laptop consumes less power than a desktop computer. Still, it is worth to know how much electricity our laptops are consuming and how much we are paying for that electricity.

Laptop electricity usage

The wattage of a laptop’s power adapter stands for the amount of power that the laptop it is designed to consume. For example, on the picture above, the power adapter’s label specify a power consumption of 130 W (Watts).

In some cases, it is possible to use power sources with lower wattage but the laptop might have to take steps to compensate for the undersized power source. 

An undersized power source may lead to slower battery charging, reduced CPU or GPU performance or some other side effects. So, it may not be a good idea to use a lower wattage power adapter to save on electricity.

Note that the laptop’s power adapter will continue to draw power even while not connected to the laptop. But the power consumption will be very low and the savings from powering off the adapter will be nearly negligible.

As shown on the picture above, our DELL laptop power adapter is rated at 130 Watts (W). This means that it will consume 0,13 Kilowatt hours (kWh) for every our of continuous usage.

If we were to use the power adapter for 10 hours a day, it would consume 1,3 Kilowatt hours (kWh) of electricity per day. Because we are paying to our electricity provider 0,217 euro per every Kilowatt hour we consume, this means that it would cost us around 0,28 euro per day to power up our laptop.

This value multiplied for the number of days that we use the laptop per year, would give us an estimate on how much we would have to pay on electricity every year.

If you want to know exactly how much power your laptop adapter is using, below you will find details about how you can use a plug-in power meter to measure the power consumption.an

Electricity usage and cost calculator

The calculator below can be used to estimate the energy consumption and the electricity cost of a laptop.

You just need to adjust the values in the PARAMETERS section to your requirements and the calculator will automatically display the RESULTS section.


For example, if your laptop’s adapter:

  • It has a power rating of 110 Watts
  • You use the laptop 8 hours a day for 320 days per year
  • You are paying 0,2 euro (or dollars or pounds) per every kWh you consume 

You will be paying around 61 euro (or dollars, or pounds, or…) per year in electricity costs.

Still, if you want to know the exact electricity usage of your laptop, or the laptop’s power adapter, while not connected to the laptop you need to use a plug-in power meter.

For more details, have a look to this post that we have created to show you how to use a plug in power meter to measure your appliances and devices power consumption.

Plug in power meter electricity consumption

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

Additional information

Not everybody it is familiar with terms like Watts, Kilowatts or Kilowatt hours so if you would like to learn more about them, have a look to this video that we have prepared for you.

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. 

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