How Many Watts Does A Laptop Use?

In the present era, many people are using laptops for working and different purposes. And, most people don’t bother about how much time and energy they are using to charge their laptops! But, if you’re a curious person or going on a long journey, you might wonder how much power your laptop consumes as more power consumption means more energy more watts’ usage.

By knowing about your device, you can calculate how much power is consumed so that you do not have to face a situation where you will end up with a dead battery. This article will discuss the total number of watts your laptop requires and how you can reduce this consumption? So, let’s get started without making any delay!

Factors That Affects Energy Consumption In Laptops

In these times, laptop manufacturing companies are trying to build more power-friendly laptops and hence use lesser power while working with the same efficiency. And are the factors affecting the energy consumption of a computer are as follows

  • Laptop Type

If you are using a standard laptop, it will consume about 60 Watts. Still, if you are using a computer specifically designed for gaming, it will consume more than that because gaming laptops tend to draw more power than regular laptops due to their speed and performance.

Remember that many laptops can even exceed more than 100 watts as they become very heated and might need a cooling pad to evacuate the heat generated in the system. Similarly, if you are charging your laptop while using it will consume more power.

It also depends on the specifications of which laptop brand you are using. For instance, a standard 15-inch Macbook takes 87W per hour, but many others take about 60-80W. So, the consumption is entirely dependent on the type of laptop you are working with!

  • Adapter

Laptops come with charging adapters that are compatible with the device. If you are using a 60W adapter, it will surely consume less power than a 90W adapter.  If you are using the adapter, which is labeled as 90W, it doesn’t mean that you are using the exact amount of watts per hour. Your laptop uses much less than that, and 90 watts will be the maximum amount it will consume.

Remember that If you are upgrading your laptop, keep in mind that the adapter must be compatible with your device; otherwise, it will not provide the necessary supply. Some of the power is always dissipated between the charging adapter and power supply in the form of heat.

  • CPU

If you are using a low-grade CPU, it will require more power than a high-performing laptop. The reason is as simple as the low-grade processor does not work well and requires more power while the high-quality CPUs are more efficient and power-friendly.

  • Graphics Card

The graphic card is responsible for the laptop’s display quality. If you use your laptop to make documents or spreadsheets, it’s OK to use a low-grade graphic card. But if you are using a laptop for gaming purposes or programming, it is time to get a high-performing graphic card.

A high-end graphics card will provide better visuals, better screen display, and higher battery; hence, it will consume more power than average graphic cards.

  • Screen Size

Screen size is another factor that plays a vital role in battery consumption. The bigger your laptop’s screen, the more power it will consume as big-screen laptops have more adapter wattage than smaller ones.

How Many Watts Does A Laptop Use?

The power consumption depends upon many factors such as screen brightness, the laptop is charging or not, adapter wattage, just as stated above. So, you may not get an exact answer to this question.

Generally, these values or watt consumption vary between 20W to 100W for different notebooks. For gaming laptops, this value can exceed up to 180W. But a typical 15-inch notebook it takes 60 watts per hour.

Moreover that here is the power breakdown of the laptop. Let start from the basics and see which part of the laptop consumes how much energy (watts)


It is evident to all that a laptop will not consume an equal number of watts. The power consumption of a laptop would vary depending on multiple factors. For instance, when the laptop is off and connected charger, it consumes about 63 power.

The laptops are likely to draw more energy while they are on charge. When the laptop is off and the charger is not connected, it uses 1 watt only. When the laptop is off and is on the sleeping mode, it also uses about 1watt per hour; therefore, enabling the sleeping mode on a notebook helps us save battery. On the other hand, when the laptop is on and is idle (windows desktop), it consumes 15 watts which is much higher than the sleeping mode.

And for details, you can check this video

  • LCD

The brightness of the screen defines the number of watts a laptop needs. When the screen brightness is maximum, the LCD is likely to consume 15 watts per hour. While, when the screen brightness is minimum, it only consumes about 11 watts per hour. So, keep an eye on screen brightness if you are interested in getting an idea about energy consumption.

  • WIFI

When wifi is disabled, it draws 15 watts of power, but when wifi is enabled, it goes up to 16 watts. So, there is not a significant difference between both scenarios.

  • CPU

When the CPU is sitting on idle mode(on windows desktop), it draws about 45 watts per hour. On the other side, when the CPU is running, it will consume 50 watts per hour. The power consumption of the CPU also depends on the processor, as a high-end processor will require less power to work.

How To Calculate Watts Used By Laptops While Charging?

You can easily find the power consumption of a laptop by its adapter. Each laptop comes with a charging adapter where information about how much watts the laptop uses is available.  For instance, if a charging adapter is labeled as 180 W, it will provide 180 watts of power to the computer. And, usually, these type of laptops is mostly gaming laptops.

What Are The Ways To Use Less Power On Your Laptop?

Here are some practical ways to reduce power consumption and have a better battery life:

  • Unplug external devices when not using a laptop

Ensure you unplug the charger after working on your laptop or when your laptop is fully charged. As discussed above, laptops consume more power when they are connected to the adapter.

  • Charge your laptop wisely

Do not charge your computer while working. But, make sure to plug in the charger when it reaches 10%. Please do not wait for it to shut down entirely, as it will draw more power to start it all over again.

  • Adjust your screen settings

As you know, the brightness of the laptop is an essential factor that decides the power consumption. So, you can lower the brightness of your screen to save energy or choose sleep mode when the laptop is idle.

Rember that low brightness will not only reduce the power consumption, but it will also reduce the stress eye-stress as well.

  • Invest in a cooling pad

With the help of a cooling pad, you can keep your laptop cool, as the laptops often get heated and consume more power while charging. Please let your computer cool down before you start operating it.


From the above discussion, anyone can get an idea about how much watts a laptop uses. As the figures can vary for each device according to its specifications, we can safely say that the expected power consumption is 60W generally, and it can exceed up to 180W for some devices depending on multiple factors.

Gaming laptops consume more watts than everyday average laptops. PC, on the other hand, draws more power than laptops. We can save our energy consumption by just keeping an eye on battery health and screen display. Always take some time to research your laptop’s specifications to have reliable power usage.

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