Laptop Power Consumption, Calculation, 6 Power Saving Tips

Laptop or Notebook PC Power consumption Calculator:

Enter the battery wattage, the charge holding time, and the per-unit rate then press the calculate button to get the laptop power consumption along with the electricity bill per hour, per day, per month, and per year.

By default, we have entered ASUS TUF Gaming FX505DT 15.6″ FHD 120Hz Laptop GTX 1650 4GB Graphics (Ryzen 5-3550H/8GB RAM/512GB PCIe SSD/Windows 10/Stealth Black/2.20 Kg), FX505DT-AL106T electrical data.

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Enter Hours Used Per Day: Hrs
Enter Battery Wattage: W
Enter Charge Holding Time: Hrs
Per Unit rate:  
Energy Per hour: Wh
Energy Per Day: kWh
Energy Per Month: kWh
Energy Per Year: kWh
Cost Per Hour:  
Cost Per Day:  
Cost Per Month:  
Cost Per Year:  
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Laptop Power Consumption:

Hey, do you have a laptop? Do you know the electricity consumption of your laptop? The laptop contributes almost 2 to 5 % of your electricity bill.

A laptop is a device that is used to store and process the data both online and offline. The electricity consumption of the laptop is purely depending on the quality of the battery, screen size, RAM, Central processing unit, Graphics card, etc.

A typical laptop consumes 15 watts to 120 watts.

Laptop power consumption E (kWh-Laptop) is equal to the input current in amps times of the input voltage in volts divided by 1000.  The laptop power consumption formula can be written as,

E (kWh-Laptop) = I (A) x V (V) / 1000

Note that, we have not considered battery storage; we have just calculated the input current and input voltage when the battery is not connected to the laptop (I mean the laptop is connected in series with the charger). Here charger output current and the output voltage will be the laptop input current and voltage.

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But in some cases, you may not able to calculate the input current and input voltage. During that time, you can calculate the laptop power consumption from the battery nameplate details.

Hence, the laptop power consumption E (kWh-Laptop) per hour in kWh is equal to the battery capacity P (Wh) in Watt-hour divided by 1000 times of the charge withstand time T(hr) in an hour. Hence the formula can be written as,

E (kWh-Laptop = P (Wh) / (1000 x T (hr))

For per day,

E (kWh-Laptop = P (Wh) * laptop working hours / (1000 x T (hr))

Per month,

E (kWh-Laptop = 30 x P (Wh) * laptop working hours / (1000 x T (hr))

Per year,

E (kWh-Laptop = 365 x P (Wh) * laptop working hours / (1000 x T (hr))

Note that, here we have considered the laptop work under the battery.


Let us take ASUS (8GB RAM, 8GB Graphic card, 19-inch screen) Laptop.

Laptop Power Consumption
Power Consumption of Asus Gaming laptop

First, find the battery storing capacity, look at the image, the battery can provide 180 Watts per hour and the battery stands 4hours without connecting charger.

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Laptop Power Consumption – 12 Hours
Battery Wattage 180
Charging Hold time 4
 Consumption Total (Wh) kWh
Hourly 45 0.045
Day 540 0.54
Month 16200 16.2
Yearly 194400 194.4


Hence, the laptop consumes 194.4 units per year

Learn more about star rating of laptop from here.

Laptop Power saving Tips:

  1. Do not keep the charger is switched on when it is not connected to the battery.
  2. Reduce the laptop screen brightness.
  3. Keep the laptop screen 30 to 40 degrees to get the optimized view. So, that we can reduce the screen brightness.
  4. Stop background applications such as cloud integration, desktop decoration application, bitcoin mining software, multiple antiviruses etc.
  5. Do not keep the laptop with the internet always. Since while connecting the laptop to the internet, which triggers the background application.
  6. Keep the laptop in a well-ventilated area or provide enough space at the bottom for exhausting the hot air.

Thank you,

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If you have any idea about the power saving of the laptop, please leave a comment below.



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