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PC power consumption and electricity cost

How much electricity a PC uses is rather difficult to calculate because many factors affect electricity consumption.

But on this page, we will explain how to determine a PC’s average power consumption and electricity cost.

How much power does a PC use

On average, a computer can consume between 60 to 300 Watts per hour, but this is only a very rough estimation.

pc power consumption

While a desktop computer will use around 200 Watts of power, a laptop computer will use around 100 Watts of power, but the exact power consumption will depend on the PC used.

For example, a PC used for rendering or mining cryptocurrencies with CPU or GPU will use much more power than one used only for browsing the internet or writing documents.

If you need to know the exact power usage of your PC, your best option is to use a plug-in power meter.

PC electricity usage monitor

If you don’t know the power consumption of your computer, or if you want to know the exact electricity usage, your best option is to use a plug-in power meter to measure the electricity consumption. 

Clicking on the image below will redirect you to the Amazon page, where you can look at the specifications of the power meter we use for our measurements.

plug in power meter

Our house appliances and devices like the washing machine, the dishwasher, the TV, or the printer are plugged into a wall socket. 

So, with a power consumption meter, we can determine how much electricity our appliances or devices are using, and, more importantly, we can measure the electricity usage over time.

Have a look at this YouTube video for more information.

Plug in power meter

PC electricity cost calculator

If you know the power consumption of your PC, the calculator below can be used to estimate the energy consumption and the electricity cost of a PC.

You need to adjust the values in the PARAMETERS section to your requirements, and the calculator will automatically display the RESULTS section.


For example, if your desktop computer has:

> A power rating of 300 Watts

> It is in use 10 hours per day and 350 days per year

> You are paying 0,2 euros (or dollars, or pounds, or …) per every kWh you consume 

You will be paying around 200 euro (or dollars, or pounds, or…) per year in electricity costs.

How much does electricity cost

If you don’t know how much you are paying per kWh, you should be able to find the cost per kWh on your electricity contract or in one of the electricity bills.

how much does electricity cost

Alternatively, if you don’t have access to your contract or your electricity bills, this website does show the electricity cost per country.

Home appliances and devices electricity calculators

Here are a few other examples from our ‘Electricity usage and electricity cost calculators‘ page that may be of your interest:

How to lower the electricity bill of a PC

A desktop computer can save a lot of electricity by correctly adjusting some settings.

1.-  Adjust the energy settings

If not in use, ensure your computer goes to sleep mode within a reasonable time. Our computers are set up to sleep after 10 minutes of inactivity.

Additionally, you may want your computer to turn off the screen after a few minutes of inactivity.

2.- Quit or uninstall unnecessary programs

Most computer programs use CPU, GPU, RAM, and Hard drives. Especially those programs that use a significant amount of CPU or GPU will significantly increase electricity usage.

And that is about it… if your computer is set up to go to sleep, turns off the screen during inactivity, and is not running any power-consuming computer programs, it will not use that much electricity.

PC electricity usage FAQ

How much electricity does a gaming PC use?

A gaming PC uses between 300 and 500 Watts per hour.

In a PC, a GPU and CPU use more electricity than all the components.

When used for gaming, the GPU and CPU are continuously in use, and that is what increases electricity usage.

How much electricity does a computer use in 24 hours?

The calculator in the ‘Electricity cost calculator’ section can be used to estimate the electricity used by a computer in 24 hours.

Electricity measurement units

Not everybody is familiar with terms like Watts, Kilowatts, or Kilowatt hours, so if you would learn more about them, look at this YouTube video we have prepared about this topic.

What is a Kilowatt hour (kWh)

Electricity measurement units calculators

Or you can have a look at this electricity measurement units calculators to get a better understanding of:

> What is a Watt (W), and how to transform Watts into Kilowatts

> What is a Kilowatt (kW), and how to transform Kilowatts into Kilowatts hour

> What is a Kilowatt hour (kWh), and how to transform Kilowatts hours into other units

> What are Power (P), Voltage (V), and Current (I)

Watt (W)
Watt (W) wattage calculator
Kilowatt (kW)
Kilowatt (kW) calculator
Kilowatt hour (kWh)
Kilowatt hour (kWh) calculator
Power, voltage, current
Power, voltage, current calculator

PCs and energy conservation

Energy conservation can be defined as the decision and the act of using less energy.

Energy conservation both benefit you and the environment

The act of saving and conserving electricity does benefit you because you will be paying less for your energy bills. 

And it also benefits the environment because conserving electricity prevents unnecessary waste of natural resources.

At the individual level, it may not look worth trying to save a few watts here or there. 

Still, every little one counts, and if hundreds or thousands of us save a little every time, it will make an important contribution towards conserving our natural resources.

Energy conservation calculator

Reducing our PC’s electricity usage, even a very small amount, would greatly impact preserving our natural resources.


For example, if 9000 households save as little as 10 Watts per day (0,01 kWh) on the PC’s electricity usage, that would add to 32850 Kilowatt hours (kWh) saved per year. 

9000 households x 0,01 kWh per day x 365 days per year 

32,850 kWh saved per year

That is a considerable amount of electricity, but let’s add additional perspectives for clarity:

> Assuming an average cost of 0,18 euros (or dollars, pounds, or any other currency) per kWh, we would collectively save nearly 6000 euros annually.

> To produce 32,850 kWh of electricity, it is necessary to use around 17 metric tons of coal or 56 barrels of residual fuel oil.

Look at this page for more information about the resources needed to produce electricity.

In any case, small energy savings do count when looking into the bigger picture.

Proven ways to save electricity at home

Suppose you are looking for ideas to save electricity at home; look at this YouTube video. We show some useful tips for reducing electricity usage at home and decreasing the electricity bill. 

How to save electricity at home
How to save
How to save
How to earn
How to earn


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