A cell phone charger will only use electricity when a cell phone has been plugged to it.

And the electricity usage of a cell phone charger it is very low.

On this page you will learn:

How much electricity does a cell phone charger use

> Does a phone charger use electricity when plugged in?

How to calculate the electricity cost of a cell phone charger

> Electricity measurement units

> How to charge cell phones without electricity

> What is energy conservation and how does it benefit you and the environment

Alternatively, you may want to fast forward to the cell phone charger electricity usage and electricity cost calculator.

How much electricity does a cell phone charger use

If you want to know how much electricity it is used to charge your phone, you need to measure the power consumption by using a plug in power meter.

In any case, the electricity consumption for charging a mobile phone it is very low. 

Phone charger electricity usage

According to our plug in power meter, even fully charged, our Samsung mobile phone is continuously using 2,8 Watts (W) while connected to the charger.

That means that the mobile phone is consuming 0,0028 Kilowatts per hour (kWh). 

2,8 W / 1000 = 0,0028 kWh

We are paying to our electricity provider 0,217 euro per every Kilowatt hour (kWh) we consume, even while fully charged our Samsung phone consumes 0,0006 euro per hour.

0,0028 kWh x 0,217 euro per kWh = 0,0006 euro per hour

On the other side, if our mobile phone is charging, the cell phone charger is continuously using 11 Watts (W), or 0,011 Kilowatts hour (kWh). 

11 W / 1000 = 0,011 kWh

Given that we are paying to our electricity provider 0,217 euro per every Kilowatt hour (kWh) we consume, while charging our Samsung phone consumes 0,002387 euro per hour.

0,011 kWh x 0,217 euro per kWh = 0,002387 per hour

Does a phone charger use electricity when plugged in?

If the mobile phone it is not connected, the mobile phone charger does not use any electricity.

If you would like to learn how to measure your mobile phone power consumption, you should have a look to this video where we show how to use a plug in power meter.

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

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.

Electricity cost calculator

If you know the power consumption of your mobile phone charger, the calculator below can be used to estimate the power consumption and the electricity cost of a mobile phone charger over a period of time.

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 mobile phone battery charger:

> Has a power rating of 13 Watts

> It needs 6 hours to recharge your phone

> You need to recharge your phone 50 times per year

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

You will be paying 4,68 euro (or dollars, or pounds, or…) per year in electricity costs.

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

Fridge electricity usage calculator icon
Freezer electricity usage calculator icon
Dishwasher electricity and water usage calculator icon
Coffee machine electricity usage calculator icon
Coffee machine

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 video that we have prepared for you.

What is a Kilowatt hour (kWh)

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)
Kilowatt (kW)
Kilowatt hour (kWh)
Kilowatt hour
Power, voltage, current
Power, Voltage, Current

How to charger cell phones without electricity

If you are outdoors or there is a power outage and your phone runs out of battery, here there are some ways to keep your phone charged.

1.- Charge your cell phone with your laptop

Charge your phone by connecting it to your laptop USB port. It will take long to get it charged and eventually it will drain the laptop battery but this is an option to consider in case on emergency.

As a tip, consider that a USB 2.0 port does deliver around 0.5 amps while a USB 3.0 port does deliver 0.9 amps. 

This is, the cell phone will charge faster when connected to a USB 3.0 

Most of the computers or laptops now come equipped with USB 3.0 ports. If your device has the letter ‘SS’ before us USB symbol, it means that it is a USB 3.0 port. 

2.- Charge your phone with your car auxiliary power outlet

If you have a relatively new car, it will have an USB port that you can use to charge your phone. 

Alternative, most of the cars do have a 12 Volts auxiliary power outlet, also called cigarette lighter socket, to which it is possible to connect a USB adapter to generate electricity.

3.- Use a solar battery charger

Solar power banks are a useful to have gadget for those who spend much time outdoors and want to be able to charge their phone, or tablets.

4.- Charge your phone with a power bank

Power banks are not very expensive and they can be used to charge your phone in case of need or emergency.

When choosing a power bank you need to put attention to the charge capacity, which is measure in milliampere hours (mAh). A 5,000 mAh power bank it is enough to power a mobile phone, but it may not be enough to charge a tablet.

A 10,000 mAh power bank should be able to charge your mobile phone several times, as well as your tablet.

Also, not that the higher the Amperes (A) of the output, the faster the power bank will be able to charge your devices.

5.- Conserve your remaining phone battery power

If you are running out of power and there is not way to charge your phone, here there are a few tips to make the battery last longer.

> Reduce the screen brightness. The higher the brightness the more power it will be used while the phone is in use.

> Disable Bluetooth, as it consumes power even while not Bluetooth devices are connected to the phone.

> Disable Wi-Fi

> Disable location services

> Enable airplane mode

> Enable low power or power saving modes

> Keep the phone, the battery, cool.

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.


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.

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.

We hope that you have found the information on this page informative and of value. 

If so, please consider to share or subscribe to our newsletter.

We dedicate a considerable amount of time and effort to create content and your support and engagement will encourage us to keep moving forward.

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