- 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 it.

Laptop electricity usage

The wattage of a laptop’s power adapter stands for the amount of power that the laptop it is designed to have. 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.

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.

Electricity usage and cost calculator

The calculator below can be used to calculate 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.


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

Additional information

Not everybody it is familiar with terms like Watts, Kilowatts or Kilowatt hours so if you would 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.

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

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