How Many Watts To Charge A Laptop ?

With the advancement of technology, we have become hooked on it. When it comes to our daily activities, we cannot imagine our life without technology. Modern technology includes a wide range of devices. However, the laptop is one of those essentials that we feel incomplete without.

Any student or worker’s life is incomplete without a laptop. Having a decent laptop is no longer an issue since there are a variety of prices and models to choose from. However, there is still a lot of confusion about how to properly use them.

A laptop requires far less energy to charge than a desktop computer with an external display. This is due to the fact that laptops are typically charged 100% once each day. It’s crucial to note that the quality of the battery you’re using determines whether or not your battery charges efficiently. Now let’s start to figure out how many watts to charge a laptop use?

 So, How many watts does a laptop take when charging?

This may appear to be a straightforward question, but it is actually complicated by a number of aspects. The amount of power required to fully charge a laptop varies depending on the model, but it typically ranges between 20 and 50 watts.

The charging process is estimated to have a normal efficiency of 70%. While 30% of the energy is lost as waste heat and radiation into the environment between the charger and the battery.

What is the hourly power usage of a laptop?

Even if you know how many Watts your charger will supply to your laptop in order for it to run. The fact is that your laptop will need significantly less in most circumstances.

Because of this, your laptop will use less Watts when it is running on battery and even when it is charging. In order to avoid overcharging, the charger’s maximum capacity is written on the device (which is usually around 20 to90 Watts).

Factors That Can Affect A Laptop’s Power Consumption

When removed from power, a laptop’s power usage can range from 20 to 100 watts. Whenever a laptop is charged, its power consumption typically increases around 10-20 percent. Both of these factors can change depending on the components of a laptop.

The following factors have the greatest impact on energy consumption:


The amount of energy your laptop consumes is heavily related to the size, wattage, and type of screen. When a 14-inch laptop is used while charging, it may use up to 60 watts over six hours. Because there are fewer screens to offer light-up, a laptop with a tiny screen, such as a notebook, can consume less electricity.

The type of adapter you use to power your laptop is also affected by the size of your laptop display. A 65-watt charger comes with a 15-inch laptop, whereas a 90-watt charger comes with a 17-inch laptop. The screen size of your laptop has a significant impact on how much power it uses, as your laptop charger will provide more power to a larger screen.


An important factor in laptop power consumption is the central processing unit (CPU), sometimes known as the processor. It’s impossible for your computer to function if it doesn’t have a Central Processing Unit (CPU).

Your laptop will use more power if you run any apps that increase the processor’s performance. This is because your laptop’s CPU will have to work harder to complete its tasks, resulting in higher power consumption. This means that your battery can drain more quickly if you use certain apps, and it may take longer to charge if you use your laptop during charging.

Graphics Card

As a result, the amount of power your laptop uses will be considerably associated with the presence or absence of a graphics card. Because graphics cards boost game performance, not all laptops incorporate them to save money and power. Graphics cards are mostly found in high-end and gaming laptops.

Typically, the laptop’s primary CPU is the only one responsible for the laptop’s graphics, therefore graphics cards consume more power than usual.

If your laptop additionally has a graphics card, the rendering of your laptop’s graphics will be split between the main CPU and the graphics card. It requires the usage of more electricity to operate the extra component. As a result, a laptop with a graphics card will demand a higher energy intake on average than a laptop without one.

Other Factors

Aside from the elements described above, there are a number of additional aspects that might impact the power consumption of your laptop. For example, listening to music, using the camera and microphone, downloading files, and how you use the internet. This means that each laptop has a distinct power consumption which depends on how the users it.

It is likely that if you use your laptop for business or school, you will be consuming less energy than if you are using it for gaming. However, even within these categories, the power consumption can differ depending on how long you use your laptop and the power of its components.

Final Words

In today’s article, we discussed how many watts to charge a laptop? In a nutshell, It’s difficult to estimate how much energy a laptop will use, but you can get a reasonable idea by reading the information written on the bottom of your laptop. You can figure out a rough estimate of your laptop’s power usage simply by multiplying the number of volts given by the number of amps listed.

It’s vital to remember that a laptop uses 10-20% more energy when it’s charging than it does when it’s unplugged.

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