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PC power consumption and electricity cost

How much electricity does a PC use it is rather difficult to calculate because many factors do affect the electricity consumption.

But on this page we will explain how to find out the average power consumption and electricity cost of a PC.

How much power does a PC use

In 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 on the PC it is used.

For example, a PC used for rendering or mining cryptocurrencies with CPU or GPU will use much more power than a PC used only for browsing 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 it will redirect you to the Amazon page where you can have a look to the specifications of the power meter we use for our measurements.

plug in power meter

All of our house appliances and devices like the washing machine, the dishwasher, the TV or the printer are plugged to 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 a period of time.

Have a look to 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 just 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 euro (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 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

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 quite a bit of electricity by just correctly adjusting some settings.

1.-  Adjust the energy settings

If not in use, make sure that your computer goes to sleep mode within a reasonable time. We have our computers setup to go into sleep mode after 10 minutes of inactivity.

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

2.- Quit or uninstall unnecessary programs

Most of the computer programs use CPU and GPU as well as RAM and Hard Drive to run. Specially, those programs that use significant amount of CPU or GPU will significantly increase the electricity usage.

And that is about it… if your computer is setup to go into sleep, turn off the screen during inactivity as well as it 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 uses more electricity than all the components put together.

When used for gaming the GPU and CPU are continuously in use and that is what increases the 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 it is familiar with terms like Watts, Kilowatts or Kilowatt hours so if you would learn more about them, have a look to this YouTube video that we have prepared about this topic.

What is a Kilowatt hour (kWh)

Electricity measurement units calculators

Or you can have a look to 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 to 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 on your energy bills. 

And it also does benefit the environment because conserving electricity prevents any unnecessary waste of natural resources.

Now, at individual level it may not look worth to try to save a few watts here or there. 

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

Energy conservation calculator

If we could reduce our PCs electricity usage, even a very small amount, it would make a big impact on preserving our natural resources.


For example, if 9000 households would manage to save as little as 10 Watts per day (0,01 kWh) on the PCs electricity usage, that would add to 32850 Kilowatt hour (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 euro (or dollars, or pounds, or any other currency) per kWh, we would collectively be saving nearly 6000 euro per year.

> 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.

Have a look to this page for more information about the amount of resources needed to produce electricity.

In any case it is clear that small energy savings do really count when looking into the bigger picture.

Proven ways to save electricity at home

If you are looking for ideas to save electricity at home, have a look to this YouTube video were we show some useful tips to reduce the electricity usage at home and decrease 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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