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Laptop power consumption and electricity cost

A laptop consumes less power than a desktop computer. 

Still, it is worth to find out how much electricity our laptops are consuming and how much we are paying for that electricity.

How much power does a laptop use

The wattage of a laptop’s power adapter stands for the amount of power that the laptop it is designed to consume. For example, on the picture below, the power adapter’s label specify a power consumption of 130 W (Watts).

Laptop electricity usage

In some cases, it is possible to use power sources with lower wattage but the laptop might have to take steps to compensate for the undersized power source. 

An undersized power source may lead to slower battery charging, reduced CPU or GPU performance or some other side effects. So, it may not be a good idea to use a lower wattage power adapter to save on electricity.

Note that the laptop’s power adapter will continue to draw power even while not connected to the laptop. But the power consumption will be very low and the savings from powering off the adapter will be nearly negligible.

As shown on the picture above, our DELL laptop power adapter is rated at 130 Watts (W). This means that it will consume 0,13 Kilowatt hours (kWh) for every our of continuous usage.

130 W / 1000 = 0,13 kWh

Important note: Someone who is actively using the laptop for very demanding activities, for example mining crypto currencies or playing sophisticates games, will have a much bigger electricity usage than someone using the laptop for browsing internet or writing a word document.

If you want to know exactly how much power your laptop is using, below you will find details about how you can use a plug-in power meter to measure the power consumptio

How to calculate power from voltage and current

If you only know the voltage and current of your laptop, you can calculate the power consumption, in Watts, using the calculator below.

 

For more information about Power, Voltage and Current, scroll down to the ‘Electricity Measurement Units’ section.

Electricity cost calculator

The calculator below can be used to estimate the energy consumption and the electricity cost of a laptop.

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 laptop’s adapter has a power rating of 110 Watts

> If you use the laptop 8 hours a day for 320 days per year

> If you are paying 0,2 euro (or dollars or pounds) per every kWh you consume 

You will be paying around 61 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.

electricity bill

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

Home appliances and devices electricity calculators

A few other examples from our ‘Electricity calculators‘ page that may be of your interest:

Game console electricity usage calculator icon
Game console electricity calculator
Computer monitor electricity usage calculator icon
Computer monitor electricity calculator
Router electricity usage calculator icon
Router electricity calculator
Printer electricity usage calculator icon
Printer electricity calculator

How to measure the exact power consumption and electricity cost

If you want to know the exact electricity usage of an air conditioner, your best option is to use a plug in power meter to measure the exact power consumption and electricity cost. 

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.

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.

A plug in power meter displaying the power usage of a device

How to lower the electricity bill

A laptop does not use that much electricity but we can reduce the electricity usage even further but following some good practices

1.-  Adjust the energy settings

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

Additionally, you may want for your laptop 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 laptop 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.

Frequently asked questions

How much power does a laptop use

It depends on the laptop model and characteristics.

The power consumption in Watts will be written on the laptop charger.

How many watts does a laptop charger use

Same answer as to the question above.

It depends on the laptop model and characteristics.

The power consumption in Watts will be written on the laptop charger.

How much electricity does a laptop charger use when left plugged in

A laptop charger will continue to draw power even while not connected to the laptop. But the power consumption will be very low and the savings from unplugging the adapter will be nearly negligible.

How much electricity does a laptop use

It depends on the laptop model and characteristics.

The power consumption in Watts will be written on the laptop charger.

Once you know the power usage, you can use the calculator in the ‘Electricity cost calculator’ to estimate the electricity usage and the electricity cost.

How much electricity does a laptop use per hour

The electricity usage and electricity cost per hour is very low.

If you know the power usage, you can use the calculator in the ‘Electricity cost calculator’ to estimate the electricity usage and the electricity cost.

For 130 Watts and a cost of 21 cents per kWh, a laptop will spend 0,028 cents of electricity per day.

The electricity usage and electricity cost per hour is very low.

How much electricity does a laptop use in 24 hours

It depends on the laptop model and characteristics.

The power consumption in Watts will be written on the laptop charger.

Once you know the power usage, you can use the calculator in the ‘Electricity cost calculator’ to estimate the electricity usage and the electricity cost.

For 130 Watts and a cost of 21 cents per kWh, a laptop will spend 0,028 cents of electricity per day.

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

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

 

For example, if 9000 households would manage to save as little as 10 Watts per day (0,01 kWh) 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. 

Two pie charts showing what home appliances and devices are using the most electricity at home.

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