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Router power consumption and electricity cost

 The routers are continuously connected to power and consuming electricity. 

If you have an old Wi-Fi router, you should find out it’s energy usage as it may be more economic to buy a newer and more efficient model.

How much power and electricity does a router use

On the picture below you can see a Wi-Fi router that was purchased 5 years ago. 

router power consumption

It consumes 31,25 Watts per hour, while the more modern routers consume around 10 Watts per hour.

Let’s run some calculations to find out the electricity usage and the electricity cost of our 31,25 Watts Wi-Fi router.

12,5 Volts (V) x 2,5 Amps (A) = an electricity usage of 31,25 Watts hour (Wh)

31,25 Wh / 1000 = an electricity usage of 0,03125 Kilowatts hour (kWh)

0,03125 kWh x 24 hours = an electricity usage of 0,75 Kilowatts hour per day

We are paying to to our electricity provider 0,217 euro for every Kilowatt hour that we consume. So, this is how much it is costing us on electricity to run our router:

0,75 kWh per day x 0,217 euro = 0,162 euro per day

0,162 euro per day x 365 days per year = 59,4 euro per year

For a Wi-Fi router, this is a considerable electricity cost so it would really be worth for us to change to a newer and more efficient Wi-Fi router…

31,25 watts router = 59,4 euro per year in electricity costs

10 watts router = 19 euro per year in electricity costs

How to calculate power from voltage and current

If you only know the voltage and current of your router, 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.

Router electricity cost calculator

If on your router’s specifications label only the Voltage (V) and Amperage (A) are displayed, this calculator can be used to calculate the Power (P) consumption.

The Power (P) consumption it is needed to make further calculations.


Once you know the power consumption in Watts (W) and how much you are paying to your electricity provider for every kilowatt hour (kWh) you consume, then you can use this calculator to estimate the electricity usage and the electricity cost.


For example:

> A 40 Watts router, connected to power the whole year and with an electricity cost of 0,217 euro per kWh, it would add around 76 euro to our electricity bill.

> A 15 Watts router, connected to power the whole year and with an electricity cost of 0,217 euro per kWh, it would add around 28,5 euro to our electricity bill.

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:

Router electricity usage monitor

If you want to know the exact electricity usage of an  router, 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.

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.

If you want to find out how you can use a plug in power meter to measure your electricity usage and electricity cost, have a look to this YouTube video.

Plug in power meter

How to lower the electricity bill of a router

Well, by now you should have came to the conclusion that the most effective method to save electricity it is to buy an efficient wi-fi router.

Of course, if you are planning to go for a long vacation you should power off your router and that would save you some electricity and money.

It may not be a huge saving but every little counts. If each one of use do switch off our routers two or three weeks per year, collectively it may add to a significant amount of electricity being saved.

Router electricity usage FAQ

How much power does a router use

A router uses between 2 and 20 Watts per hour.

How much energy does a router use

Power and energy refer to the same term.

A router uses between 2 and 20 Watts per hour.

Does a wifi router use much electricity

No, the power consumption of a router it is very low so they don’t use much electricity.

You can use the calculator from the ‘ Electricity cost calculator’ section to calculate the electricity usage and the electricity cost of a router.

Electricity measurement units

Not everybody it is familiar with terms like Watts, Kilowatts or Kilowatt hours so if you would like to 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

Routers 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 routers 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 routers 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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