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How Many Watts Does A Laptop Use When Charging? {Explained}

When the laptop battery is low, most of us usually plug in the charger to replenish the battery. But have you ever wondered how many watts your laptop uses when it is charging? If yes, then today, you have landed in the right place. Many factors determine how many watts a laptop consumes when charging. In this article, we will tell you how much energy your laptop usually consumes when charging, how much power you need to charge a laptop, and things that affect battery life.

How many watts does a laptop use?

According to data released by the United States Department of Energy, a laptop uses between 60W-90W of electricity per hour. Several factors determine how many watts a laptop uses. They include:

  • Laptop type

One of the main factors that determine how many watts a laptop uses is the type of laptop you are using. If you are using basic laptops, then it will consume between 60W- 90W per hour. However, if you are using a high-end laptop like a gaming laptop, then it will consume more watts per hour. Multiple tests have shown that high-end laptops like gaming laptops use about 100W per hour. That explains why they usually become very hot and need an extra cooling pad to keep them cool while operating

  • CPU

The CPU that the laptop is equipped with will also determine how much power it consumes. For example, a laptop equipped with a low-grade processor consumes more power than a laptop equipped with a powerful processor like i7; This is because a low-grade CPU needs more power to keep your laptop running than a powerful CPU.

  • Adapter wattage

Your adapter watts also indicate how much power your laptop consumes. For instance, if your laptop is charged by a 60W adapter, it will consume less power than a laptop that is charged by a 90W adapter. The more wattage an adapter has, the more power the laptop consumes. One more thing to point out here is that charging a laptop with an HDMI cable or charging laptop in a car will consume less power than these charger adapters

  • Graphics card

The graphics card that the laptop is equipped with will also determine how much power it will consume. Laptops equipped with powerful GPUs usually consume more power than those equipped with standard GPUs. If your laptop is equipped with a high-end graphics card, it will provide better visuals, especially when playing high-end games, which means more power consumption.

  • Battery size

Laptops equipped with larger battery sizes usually consume more power than those equipped with smaller battery sizes; larger batteries take more time to charge than small batteries. However, larger batteries usually last for a more extended period than smaller batteries once charged.

  • Display

The size and type of display that your laptop is equipped with also determine how much power it consumes. For instance, a laptop equipped with a 17-inch screen consumes more power than a laptop equipped with a 13-inch screen. That is why laptops with larger screens usually come with adapters that have higher charging capacity than those equipped with smaller screens. For instance, most laptops with 17-inch screen laptops usually come with a 90 watts charger, while those with a 15-inch screen usually come with a 60 watts charger.

How many watts does a laptop use while charging?

A normal office, business or even 12-year old kid laptop uses between 60 and 90 watts per hour while charging. The best way to know how many watts your laptop consumes when it is charging is by checking the adapter that it comes with. The wattage indicated on the adapter is the watts that your laptop consumes per hour when charging. If you are keen, you must have noticed that laptops consume more power when charging; This is because the power supplied by the adapter is used to power the laptop and at the same time charge the battery.

How much power do I need to charge a laptop?

In order for your laptop to charge, the adapter has to have more output than what the laptop consumes. For instance, if you have a 30 watts adapter and you are running a heavy program that consumes more power than what the adapter is supplying, your laptop will not charge. The general rule of thumb when it comes to charging a laptop is that the power supplied by the adapter must be more than the power consumed by the laptop. However, according to the United States Department of Energy, an adapter with an output of at least 50 watts can provide sufficient power to charge a laptop.

Things that may affect battery life

One of the crucial things that affect your battery life is your programs. For instance, if you run heavy programs that consume more power, your battery will be drained much quicker than when running fewer intensive programs. When you run intensive programs, your laptop will be forced to work harder and, in the process, drain the battery quicker. Other things that may affect your battery life include screen size, CPU, and GPU.

Frequently Asked Questions

Does laptop charging consume more power?

YES, when charging a laptop, its power consumption increases by up to 20%. For instance, if a laptop consumed 50 watts per hour, it would consume about 55W when charging. The laptop consumes more power when charging because power is used to charge the battery and run the laptop.

Can I use a 65 Watts charger on a 90-watt laptop?

YES, you can use a 65 watts charger on a 90 watts laptop. The only thing is that the adapter will charge the battery much slower than the 90 watts charger, especially when running heavy programs that consume more power.

Can I charge a laptop on an 18 watts charger?

YES, but it depends on the charging technology that the laptop is equipped with and the power consummation of the laptop. For instance, MacBook air can be charged by an 18 watts charger because they consume less power. If a laptop consumes more power, you have to switch off the laptop when charging it with an 18W charger. More so, it will take a lot of time before the battery charges to full capacity.

How many watts does an HP laptop use?

The watts that HP laptops use vary depending on many factors, including the screen size, CPU, GPU, battery size, laptop type, and much more. But generally, most HP laptops use between 60 and 90 watts of power. Check your HP charger to know the exact watts that your HP laptop uses.

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