How Many Watts Does a Laptop Use When Charging?

How Many Watts Does a Laptop Use When Charging

Laptop PCs, or laptops, are portable computers that have evolved over the years from single core processors with little memory and limited graphic capabilities to multi-core devices capable of using multiple monitors and including a video graphics card. Laptops run on battery power in most cases but can also be plugged into an AC adapter to run off of electric power. Laptops use a variety of power adapters, some with wattage as high as 120 watts.

How many watts does a laptop use when charging? That depends on the laptop. Older laptops may use a lower wattage adapter, while newer laptops require a higher wattage adapter to charge. Laptops that come with a 65-watt power adapter, for example, will use that same wattage when charging. If a laptop has a 120-watt power adapter, it will use that wattage when charging. A laptop that has a 65-watt power adapter will not use 120 watts to charge, and visa versa.

Different factors affecting the laptop charging:

  • Battery level: If the laptop has a low charge, it will require a higher wattage to recharge.
  • Power adapter type: Some laptops have different power adapters that use different wattages. For example, a Toshiba laptop may have a 65-watt and a 45-watt power adapter for charging. Depending on which one is used, the wattage will be different.
  • Laptop model: Some laptop models use more power than others. Laptops with high-definition displays and powerful processors will require a higher wattage adapter to charge.
  • Central Processing Unit: The Central Processing Unit, or CPU, is the brains of the computer. It interprets and executes instructions to perform tasks such as processing data or writing output. The amount of power a CPU uses depends on its voltage, clock speed in hertz, bus speed in megahertz and the number of cores it has.
  • Dual graphics card: Some laptops have a dual graphics card that includes an internal and external card. The integrated card, or Intel HD Graphics as it is known, allows the CPU to communicate with the video chipset on the motherboard to display information. The external graphics card has its own processor and memory that allow it to produce high-definition visuals. When both graphics cards are in use, the laptop uses more power.
  • Other parts of the Laptop: Other components of the laptop that use power when in use include wireless cards and sound cards.
  • Display: The display is the part of the laptop that the user sees and interacts with. It can be a standard or high-definition display. A high-definition display requires more power to operate than a standard display.
  • Cooler Fan: Some laptops come with a cooler fan that helps keep the computer cool when in use. This fan uses power to operate.
  • Charging an iPhone: An iPhone requires 5 watts of power to charge. Although an iPhone can be charged with a lower wattage adapter, it will charge more slowly than if using a higher wattage adapter.
  • Charging an Android: An Android phone requires between 8.5 watts and 10 watts of power to charge. Lower wattage adapters will not charge an Android phone as quickly as a higher wattage adapter.
  • Charging other electronic devices: Most electronics require 5 volts 1 amp of power to fully charge, but some devices may require more or less wattage depending on the make and model.


So, how many watts does a laptop use when charging? It depends on the factors listed above. Laptops that require a higher wattage adapter to charge will use more watts than those with a lower wattage adapter. Older laptops that don’t have high-definition displays or powerful processors usually use a lower wattage adapter and will use less watts when charging. For the most part, laptop batteries are designed to only accept a certain amount of wattage, so using a higher wattage adapter than what is needed can damage the battery. It’s best to use the power adapter that came with the laptop to avoid any problems.