UK to Guam power adapters - do you need a plug adapter in Guam?

Guamanian power outlet

What adapter do I need for Guam?

You'll need to use a Type B plug adapter for Guam if your plug doesn't fit into a Guamanian power outlet.

The type of power adapter, power converter or charger that you'll need when visiting Guam all depend on the voltage and type of device that you're attempting to charge with a Guamanian power outlet. If you're not sure which voltage your device uses then read the section about how can you tell if you have a single voltage or dual voltage device before going any further.

  • If you're from the US visiting Guam then you will not require a power converter or an adapter. One suggestion however is to pack a USB travel power adapter as it allows you to charge multiple devices using only one charger.
  • If your device can run on 110 volts or is dual voltage and your plug fits in a Guamanian power outlet then it should work in Guam without needing anything else.
  • If your device is 110 volts or is dual voltage but your plug doesn't fit in a Guamanian power outlet you'll need a suitable plug adapter for Guam such a Type B plug adapter. Please be aware that a plug adapter for Guam (or power adapter) is designed to change the shape of the plug on your device to fit into a plug outlet found in Guam, but but is unable to change the voltage from 110 volts to a different voltage.
  • If your device doesn't run on 110 volts and isn't dual voltage you will also need a power converter for Guam to convert the voltage from 110 volts to the correct voltage for your device. You'll still need to bring along a suitable plug adapter for Guam if your power converter doesn't have the correct Type B plug adapter.
  • If you simply need to power one or more USB devices such as cell phones or tablets then a USB travel power adapter will be more suited and it should be dual voltage, but make sure that you bring one which includes a Type B plug adapter otherwise you will also need to use a suitable plug adapter for Guam[3] [AD]
  • Increased use of a phone during a trip will create an extra demand on the battery, we suggest bringing a portable charger if you want to recharge your cellphone battery whilst visiting an unfamiliar location.

Warning: If your device won't handle 110 volts you run a risk of an electrical fire hazard, blowing a fuse or damage to your device. Before attempting to use your device in Guam please read the instruction manual to ensure safe operation.

Guam power adapters

Power adapters for Guam

Different combinations of standards and plugs can often be daunting when planning on visiting another country especially if you've never visited before. This isn't as complex as it first appears, with only a handful of different types of plug sockets being used in the world this guide shows exactly what you'll need in advance to power your electronics in Guam. This page contains links to step by step instructions demonstrating exactly which power adapters you'll need to supply power to your devices when you're travelling to Guam using the standard types B or A Guamanian 110 volt 60Hz plug outlets. You'll discover most power adapters will vary from region to region so please read our Wikiconnections world power adapters list where you'll find a complete list of regions and countries.

What is the best power adapter for Guam?

The best power adapter for Guam is a Type B power adapter which will allow you to use any 110 volt device or appliance. [3] [AD]

What is the best power adapter for Guam?

What is a power adapter?

A power adapter for Guam is a small and cheap plastic adapter which permits a Guamanian power outlet to accept a different type of power plug from an appliance from another region.

Also known as: an electrical adapter, plug adapter, travel adapter, electrical adaptor, mains travel adapter or power adaptor[5]

Do I need a plug adapter for Guam?

This depends on the location you are travelling from and the shape of plug you want to use in Guam.

What does a power adapter for Guam do?

A power adapter allows a visitor travelling from another location to use their own electronic and electrical devices in Guam by adapting the shape of the power plug to fit the power outlet.

Can a power adapter change the voltage from a Guamanian power outlet?

Power adapters will only adapt the shape of a plug to fit into a 110 volt Guamanian power outlet and is unable to convert to a different voltage. Should you need to safely use any 220-240 volt device you also need to bring a more expensive step up power converter for Guam.

Where to buy a power adapter for Guam in the UK

Power adapters for sale in an airport

Where to buy a power adapter for Guam in the UK

Guam to UK power adapters will most likely be available to buy in the UK from airports such as Heathrow, Gatwick, Manchester, Stansted, Luton, Edinburgh, Glasgow and Birmingham prior to departure, however the range of adapters might be limited to popular destinations. It is recommended to research the exact type of adapter required prior to shopping at the airport. Look in the travel accessories section of airport newsagents, electronic stores and pharmacists such as WH Smith, Dixons or Boots but expect to pay 50% more than regular prices.

It will be more convenient and cheaper to buy the correct power adapter in advance of your trip. UK high street electrical shops, newsagents and chemists such as Currys PC World, WH Smith or Boots normally typically only sell popular types of travel adapters covering a limited number of countries however for widest choice it is recommended to buy a power adapter online. In January 2019 we checked 2 high street branches of WH Smiths without seeing any power adapters available to purchase and 1 branch of Boots only had a pack of European adapters available.

Electrical adapters for Guam

Travel Power Strips

A power strip with multiple USB ports

Travel Power Strips

Benefits of a travel power strip

  • Capable of charging multiple appliances and devices concurrently using only one Guamanian power outlet, costing £35-£40.
  • You will find certain models are able to convert voltage for lower wattage electronics. Even if your appliance isn't dual voltage it can still work with a Guamanian power outlet when using just a travel power strip. This makes a travel power strip a cheaper lightweight substitute for a voltage converter.
  • Some travel power strips should also include multiple USB ports.
  • The voltage from power outlets in certain areas might be tempremental, a surge in power can damage delicate electronics. There are some models which include a built in surge protector to protect any device from being overpowered by unstable power grids.
  • The power strip can be functional domestically.

Disadvantages of a travel power strip

  • Unlike a dedicated power converter, the voltage converter on a travel power strip won't support high wattage appliances such as curling irons and hair dryers.
  • Because of their size travel power strips might be too heavy for hand luggage.
  • Travel power strips might be excessive for some travellers only bringing a small number of appliances which need powering. [6] [AD]
  • Power strip models for sale in the UK only include type B, F, G and I plug adapters so you may need to use it along with an additional plug adapter to work in some countries.
Power Plug Adapters

A cheap and simple type B plug adapter

Power Plug Adapters

Benefits of a power plug adapter

  • Light and compact.
  • Affordable, prices £4-£5.
  • Simple to operate.
  • Bringing a Type B plug adapter will work in Guam.

Disadvantages of a power plug adapter

  • Only one plug adapter for each device - for every individual device you'll also need to bring a separate power plug adapter.
  • A plug adapter only alters the shape of the plug to fit in a Type B Guamanian power outlet and not the actual voltage used in Guam, so if your appliance doesn't support a 110 volt outlet and isn't dual voltage you'll also need to pack a separate voltage converter.
  • Hotel rooms in Guam might only have one wall outlet, therefore you will only be capable of charging one device at a time.
  • You will also need to bring a separate domestic USB charger as well if you wish to charge a USB device.
  • If you plan to travel to more than just one country then you may need to bring more than one type of plug adapter for other countries. [3] [AD]
Travel USB Wall Chargers

A USB travel charger with swappable plugs

Travel USB Wall Chargers

Benefits of a travel USB wall charger

  • Ideal in situations when you only want to charge devices which use USB.
  • You only need to bring one charger instead of packing multiple domestic power chargers which costs on average under £15.
  • Supplied with interchangeable adapter heads which make them useful in a large number of locations. Interchangeable adapter heads supplied with travel USB wall chargers are usually lightweight and small which makes them easy to pack in hand luggage.
  • Travel USB wall chargers will include a surge protector built in.
  • The charger could still be functional domestically.
  • The interchangeable plugs fit in Types A/B, E/F, G and I outlets so will work with a Guamanian power outlet.

Disadvantages of a travel USB wall charger

  • They only have USB ports so you can't charge any electrical appliances, just USB powered ones. [7] [AD]
Universal Travel Power Adapters

A universal travel adapter

Universal Travel Power Adapters

Benefits of a universal travel power adapter

  • Perfect for visiting to multiple countries. Typical models operate in over 150 different countries.
  • An all in one compact design, lightweight and small, around £15.
  • There are some models which include multiple USB charging ports built in.
  • Easy to use.
  • There are some universal travel power adapters that include a surge protector built in which will protect your electronics from being overpowered by unstable power grids.
  • Retractable pins won't catch against other items when packed in your baggage.
  • When you return to the UK the power strip should still work as a USB charger.
  • Changes shape to Types A/B, E/F, G and I plugs so should fit into a Guamanian power outlet.

Disadvantages of a universal travel power adapter

  • Universal adapters will overload when used with a high power appliance such as hair straighteners, kettles, hair dryers or curling irons.
  • The internal moving parts such as shutters and pins could be fragile on some universal travel power adapters which might make them likely to jam.
  • Only charges a single plug.
  • Might not work in some countries - models might not cover some countries with less popular power outlets.
  • Missing a built in power converter means it won't be suitable for non-110 volt devices. [8] [AD]
Plug Adapter Sets

Plug adapter sets

Plug Adapter Sets

Benefits of a plug adapter set

  • With prices roughly £5-£10 a set works out more cost-effective than purchasing individual power plug adapters costing around £5 each.
  • Covers all plug outlet types and not just a Guamanian power outlet.
  • If you are visiting different countries this is the most flexible option.
  • Each plug adapter set includes Type A, B, C, D, E/F, G, H, I, J, L, M and N plugs so should be compatible with a Guamanian power outlet.

Disadvantages of a plug adapter set

  • Will involve planning - before any trip you'll have to choose which plug adapters to pack, if you don't know every country you'll be visiting you'll need to bring each power adapter in the set with you.
  • Means lots of individual items to pack.
  • The remaining power adapters will be useless and using up packing space.
  • Not all plug adapter types are typically included in the set (and especially rarer ones), so ensure that your set has an adapter which is compatible with a Guamanian power outlet.
  • Only modifies the shape of the plug to fit in a Guamanian power outlet but won't change the voltage. [9] [AD]
Voltage Converters

Larger voltage converters

Voltage Converters

Benefits of a voltage converter

Disadvantages of a voltage converter

  • Only changes the 110 volts from a Guamanian power outlet and won't change the actual shape of the plug to fit in a Guamanian power outlet, you'll still need to bring the correct type of plug adapter.
  • Costly; £80-£90.
  • The normal size of most models makes them unsuitable for hand luggage.
  • Redundant after your trip to Guam.
  • Often better value to purchase a dual voltage travel appliance than to buy an expensive power converter just to bring your existing appliance in Guam.
  • If you are travelling from Britain go to Guam then you will require a voltage converter as the voltage from a Guamanian power outlet is 110 volts. [10] [AD]

Comparison of electrical adapters for Guam

Type B Power Plug Adapter
Power Plug Adapter
Universal Travel Power Adapter
Universal Travel Power Adapter
Travel USB Wall Charger
Travel USB Wall Charger
Travel Power Strip
Travel Power Strip
Plug Adapter Set
Plug Adapter Set
Voltage Converter
Voltage Converter
Can be used in Guam Yes Yes Yes Yes Yes Yes
Types of plug included B A/B, E/F, G and I A/B, E/F, G and I A, B, D, E/F, G, H, I, L and N A, B, C, D, E/F, G, H, I, J, L, M and N B
Compatible number of countries (A) 45+ 150+ 150+ 200+ 230+ 230+
Fits in a Type B Guamanian power outlet Yes Yes Yes Yes Yes Yes
Useful when you return to the UK Yes Yes Yes
Typical combined number of USB ports and AC outlets 1 3 4 7 1 2
Powers USB devices Yes Yes Yes
Typical number of USB ports 0 2 4 4 0 0
Powers a 110 volt AC appliance in Guam Yes Yes Yes Yes Yes
Typical number of AC outlets 1 1 0 3 (B) 2
Converts voltage (?) Yes (C) Yes
Surge protection Yes Yes Yes Yes
Typical dimensions 2.6 x 1.9 x 1.4 inches 3 x 2.1 x 2.1 inches 4.3 x 3.4 x 1.3 inches 6.6 x 3.6 x 1.5 inches 7.1 x 3.9 x 2.8 inches 11.7 x 8.1 x 6.7 inches
Typical weight 4.5 ounces 4 ounces 4.5 ounces 1.6 pounds 13 ounces 20 pounds
Typical number of items to carry (D) 1 1 5 8 12 2
Suitable for hand luggage Yes Yes Yes • (E) • (F)
Estimated price under £5 £15-£20 £10-£15 £35-£40 £5-£10 almost £110
Buy Buy Buy Buy Buy Buy

Guam power outlets and plug sockets

What plug sockets are used in Guam?

Type A and B power outlets

What plug sockets are used in Guam?

There are two different types of power outlets used in Guam, types B and A with the primary power outlets being type B:

  • Plug Type A - You can recognise the plug socket by 2 adjacent slots where the twin plug socket pins go.
  • Plug Type B - This wall outlet, also known as a type B power outlet, can be identified by 2 slots parallel to each other for live and neutral blades with a single semicircle shaped hole below for the grounded pin. [3] [AD]

What is the frequency used in Guam?

The frequency of the alternating current from a Guamanian power outlet is 60Hz. [11]

How do I use a 220 volt appliance in Guam?

To use a 220 volt appliance in a Guamanian power outlet you need a step up power converter.

Do I need a power bank for Guam?

A USB power bank

Do I need a power bank for Guam?

It is always advised to bring a power bank to recharge mobiles whilst on a trip.

  • For many the thought of being offline can cause anxiety, especially when being needed abroad. Whilst travelling increased use of smart phones for taking photos, storing calendars, sat nav, social network sharing and staying entertained can syphon off power towards the end of the day. A flat smart phone battery could potentially leave you in an unknown location without adequate power to make an emergency call or being able to use a GPS app to find your way back to hotel. By packing a portable charger for Guam lowers the risk as it means you can keep your cell phone powered on the go.
  • A 10,000mAh power bank can store enough electricity to power over three full charging cycles and a 20,000mAh power bank should keep a typical smart phone charged for roughly seven days. A mAh rating (or milli ampere-hours) shows the capacity of a battery and gives an indication of the number of cycles the power bank can do, and a higher number is more suitable for travellers.
  • If your laptop supports USB-C charging then packing a portable charger for a laptop marked with PD (power delivery) that supplies at least 20Wh can be used to recharge your laptop.
  • Be aware that some airlines prohibit portable chargers on an aircraft that supply 100 Wh of power or more and must be kept in carry-on luggage only.
  • Consumer power banks won't work with high wattage items, although a rechargeable hair dryer or gas hair straighteners are designed for travelling.    [4] [12] [13] [14] [15] [16] [AD]
How well do solar battery chargers work in Guam?

Solar backpacks are ideal in hot countries

How well do solar battery chargers work in Guam?

The sunshine in Guam should be adequate enough to charge solar power bank dependably, however it will need to be exposed to strong daylight to produce enough power for a single charge cycle. It may prove inconvenient to constantly unpack a solar power bank then wait for it to recharge in sunny spells.

  • The much larger solar cells used on a solar backpack will give the bag the ability to generate more power within a faster period of time, making them ideal for the climate in Guam.
  • A device that has been directly plugged into the USB port of a backpack should gradually top up the power during sunny spells in Guam, however might be inconvenient to have it constantly tethered in the bag during the day if it is to be used frequently. A regular power bank plugged in a solar backpack can be continuously powered up inside the bag during sunlight, afterwards you can power up the phone from the power bank at any time without being attached to the bag.
  • Although the climate in Guam is suitable for solar power, a bag should have a solar cell efficiency of 22% or more, be able to generate at least 6 watts of energy and can be used with a power bank of 10,000mAH or stronger. The flexible and durable solar panels used in solar powered bags are designed to survive scratches and bending, unlike normal solid solar panels. They are found in backpack, messenger and rucksack styles making them perfect for domestic, work and travel.  [4] [17] [18] [AD]


Guam chargers

What is a USB travel power charger?

A USB travel charger is a dual voltage charger with interchangeable plugs and multiple USB ports, suitable for charging multiple USB powered devices when travelling abroad.

What USB charger do I need for Guam?

When travelling to multiple countries the best travel adapter for Guam to buy is a multiple USB port adapter which includes swappable plugs like a 4 port USB travel charger. There are two types of wall outlets in Guam (B and A) and using a travel charger like this ensures that you are covered for type A.

As these types of chargers come with interchangeable plugs and handle 100 - 240 volts will mean that you can travel to over 100 countries in North America, Europe, Asia and Africa simply by switching the plugs over. If your model of device can support Fast Charge then you will benefit from faster recharging times by using one of these types of power chargers and additional compatibility with more power hungry devices. This means you can power more than one device at the same time without needing to bring multiple travel chargers or occupying additional power outlets. Only bringing a single lightweight USB travel charger will also keep the overall size and weight down, making it perfect to store in hand baggage while travelling. Because of their space saving versatility these types of power chargers can be used when you return home so when you're not on holiday they can sit under your bedside table charging multiple phones, tablets and speakers and using just a single plug socket.

For those travelling often we recommend searching for this type of versatile power charger online. The power charger illustrated here is the 4 Port USB Wall Charger which has been tested successfully for recharging multiple USB devices in numerous different countries. [7] [AD]

What USB charger do I need for Guam?

Why use a travel USB charger for Guam?

  • Most travel USB chargers include multiple USB charger ports, this means that you should only need to bring a single charger to charge all your devices. Instead of bringing 4 individual power chargers you only need to pack a single 4 port USB wall charger and power up to 4 separate devices, thereby cutting down on the size and weight of your baggage.
  • All travel USB power chargers should include interchangeable plug heads for different power outlet types. This is ideal if visiting other countries which will probably use a different standard to Guam.
  • Good chargers are lightweight, compact and rugged; perfect for the rigors of travel instead of than risking bringing a domestic charger which might be hard to replace or repair in Guam.
  • USB travel chargers can accept both the 110 volts used in Guam power outlets and different voltage standards across the world.
  • It's possible that some hotels in Guam only have one power outlet, by using a travel charger with multiple USB ports means you can share out the single power supply with family or other traveler instead of waiting to charge one device at a time.
  • Due to their flexible nature they take the worry out of travelling to an unknown country as they are guaranteed to work almost anywhere on the planet.
  • Power outlets found in airports can be scant and demand for charging multiple devices before a flight can be high, so a USB travel charger with multiple ports and the capability to fast charge is perfect.
  • The power grid in some countries can be unstable, a travel charger allows for unexpected spikes and will help prevent damage to any devices attached to it. Attempting to repair an overloaded mobile phone in Guam might prove inconvenient and costly.
  • Premium USB travel chargers will also incorporate power outlet strips to power low wattage domestic appliances such as laptops, however these are unsuitable for high wattage appliances such as hair dryers or clothes irons. Read the guide on using travel appliances in Guam for advice and guidelines on the best power adapter for using a high powered appliances in a Guamanian power outlet.
  • Certain mobile phones could require more than the normal 500 mA produced from a standard 5 volt USB power adapter to charge or provide fast charge. Ensure that the USB power adapter can support fast charging should any of your devices need extra power.
  • On returning home travel USB power chargers can still be used by charging multiple mobile phones on a daily basis using only a single power outlet. [7] [AD]

What is the best USB charger for Guam?

A 4 port USB travel charger is the most compact option for travellers from any country who only have USB devices, but for visitors also wanting to use their domestic plugs these power converters provide larger but more versatile solutions. All 3 power adapters offer surge protection which can be useful for visitors of regions with unstable power grids to prevent damage to any connected devices from voltage spikes. These power adapters come with interchangeable type C, I and G plugs covering Europe, America, Australia, United Kingdom, Japan, China and over 150 destinations:

  • BESTEK Portable International Travel Voltage Converter - The BESTEK international travel converter has 4 USB charging ports with 3 AC power outlets and is the most popular portable power converter for travellers originating from America going to Guam using 3 pinned type B US plug sockets.
  • ORICO Traveling Outlet Surge Protector Power Strip - Likewise having 4 USB ports but only 2 AC power outlets the travel adapter from Orico is also aimed at travellers from North America using type B plugs. This is a more cost effective alternative to the BESTEK with only 1 less AC outlet at almost half the price.
  • BESTEK International USB Travel Power Strip - This power strip has 2 AC outlets but offers 5 USB charging ports. This versatile power strip is compatible with both American plugs and popular plug types A, D,E/F, G, H, I, L and N making it perfect for a majority of travellers from around the world visiting Guam. [7] [AD]

Power converters for Guam

What is a power converter?

A power converter will enable you to use a 220-240 volt electric device with a 110 volt Guamanian power outlet.

Also known as: electrical converter, electrical transformer, voltage converter, power transformer or voltage transformer.

What is the difference between a power converter and a power adapter for Guam?

An expensive and heavy power converter converts a 110 volt Guamanian power outlet to work with a non-110 volt appliance, whereas a more lightweight and smaller power adapter (or plug adapter) will change the shape of the plug on your device to fit into a power outlet found in Guam. [19] [AD]

Do I need a power converter for Guam?

When visiting Guam from another country please ensure your device will accept a 110 volt power supply.

  • You need a step up power converter if you are travelling from a country that uses 220-240 volts and your device won't support 110 volts. Read our world power outlets guide to find out the voltage is used in your country.
  • You shouldn't need a power converter if you are already using either a single voltage device that works with 110 volts or one that is dual voltage.
  • Normally devices which originated from a country which use a higher voltage (such as 230 volts) and used in a 110 volt outlet may take longer to charge or simply won't power up. If your device does not power up or charges slowly when you are travelling to Guam from a different country check that it can be used with a 110 volt power supply otherwise you will need to use a step up power converter.
  • You shouldn't need a converter if you need to power a smaller electrical device such as a cell phone as these are typically designed for international use and dual voltage, but you should always check the device for dual voltage support first.
  • When powering high wattage appliances or generate heat (such as hair straighteners or curling irons) then you will need to use a much larger higher wattage heavy duty power converter.
  • Investing a robust lightweight dual voltage travel appliance will be more cost effective and practical than carrying a much heavier high wattage power converter in order to use your existing domestic appliance in Guam.
  • Read our travel guides on how to use clothes irons, curling irons, hair dryers and flat irons in Guam , along with advice on affordable dual voltage alternatives.  [10] [20] [AD]

What kind of converter do I need for Guam?

You need to buy a step up power converter in order to use any 220-240 volt appliance in Guam. [10] [AD]

What is the difference between a transformer and a converter?

Voltage converter

What is the difference between a transformer and a converter?

Converters and transformers are both used to change one voltage to another, but this ambiguity can cause confusion as their purposes are different:

  • Power converters are designed for simple electrical appliances which typically generate heat or use motors such as clothes irons, shavers or hair dryers. Transformers are designed for more complex electronic items such as televisions or games consoles.
  • Buying a power converter is cheaper than buying a power transformer.
  • Power transformers are larger and heavier making them more suited for permanent residential use; for example an expat wishing to use an imported television would need to use a transformer for this purpose.
  • Power converters are more suitable for travellers wishing to bring domestic appliances abroad such as hair dryers or flat irons. However, it is more practical and cost effective to purchase a dual voltage appliance designed for travel rather than a heavier power converter.
  • Power converters are suitable for 2 pin ungrounded appliances, it could be harder to find a converter if you want to use a grounded 3 pin appliance.
  • Transformers can be used constantly however it is recommended that converters are used for no longer than a couple of hours at a time.
  • Shops may sell transformers under the name of converters, for the purposes this guide we will be referring to both converters and transformers as converters.

How to convert 110 volts to 220 volts

  1. Use a step up power converter to allow you to use 220, 230 and 240 volt appliances with a 110 volt Guamanian power outlet.
  2. If the power converter doesn't include the correct shaped plug then it will also be necessary to plug in the power cord from the power converter into a power adapter for Guam before plugging that into a Guamanian power outlet.
  3. Some power converters include the ability to perform both step up and step down voltage conversions, therefore it may be necessary to manually switch the converter to output the voltage from 220-240v.
  4. Plug your appliance into the converter and turn the power on, your 220-240 volt appliance can now be used with a 110 volt Guamanian power outlet. [10] [AD]

What voltage is used in Guam?

Guam uses 110 volts in their normal power outlets. [2]
What voltage is my appliance?

Single voltage hair dryer

What voltage is my appliance?

The best method to tell if your device is dual voltage is to look for a sticker on the supplied charger or on the unit itself, typically on the rear or near to where the power cord goes. This location might depend on the make or model of your unit but could also be written on the box or in the instruction manual.

  • Single voltage devices might have a specific number - such as 240V.
  • Single voltage devices could also have a small voltage range (around 20 volts) with a dash to accomodate small voltage fluctuations - such as 100-120V.
  • Dual voltage devices will say a large voltage range separated with a slash - such as 100/240V.


See the power adapter substantions section for more information on how we compared travel adapters (October 2018).

What type of adapter do you need for Guam?

Which type of plug adapter do you need for Guam?

The power converter or plug adapter which is suitable for Guam depends on various requirements. Prior to deciding which one to bring we suggest using the following checklist:

How many electrical items will you be taking to Guam?

Family may need to power devices too

How many electrical items will you be taking to Guam?

  • List how many items you want to bring to Guam (including phones, laptops, eReaders, hair straighteners or clothes irons).
    • Remember to take into account that you might own more electrical devices in the future. Do you intend on buying a new tablet computer next year for example?
    • There is a growing number of rechargeable devices such as electric shavers that use a USB port for their power source. Therefore next time you buy a new device it could need a USB power adapter so remember to check that your travel adapter has enough spare ports to support these too.
  • Will you be travelling with a partner who might need to charge their iPads too?
What different types of electrical items do you need to use in Guam?

Make a list of items to bring

What different types of electrical items do you need to use in Guam?

  • There are 3 types of electrical devices or appliances:
    • Low wattage electrical devices which can be plugged into a power outlet - for example cameras and laptops.
    • High wattage appliances that can be plugged into a power outlet - for example clothes irons and hair dryers.
    • USB powered electrical devices which plug into a USB port - for example cellphones.
  • If you only have to bring along just USB powered devices to Guam then you'll find that a travel USB charger is ideal as you will only have to pack one compact charger plus your charging cables.
  • Travel power strips are built for providing power and voltage conversion for many low wattage devices of any voltage, however unsuitable for high wattage appliances (such as clothes irons) which need voltage conversion.
Will you only be charging USB devices in Guam?

Are you only charging USB items

Will you only be charging USB devices in Guam?

  • Should you only plan on packing devices such as phones or tablets to use in Guam then we suggest just packing a travel USB wall charger.
  • If you only use a simple power plug adapter you will still need to bring the USB power charger that was supplied with your device too. [7] [AD]

Will your devices and appliances only work with a 110 volt power outlet?

How many wall outlets are available in Guam?

Are multiple wall outlets available

How many wall outlets are available in Guam?

  • The accommodation in Guam may have only a single power outlet, this will present an inconvenience if charging up multiple electronic devices such as phones, tablet computers and cameras overnight as you will only be able to recharge a single device at a time every few hours.
  • Should you wish to recharge multiple devices simultaneously then we recommend packing either a travel power strip or USB wall charger which are capable of charging multiple USB ports and outlets. [6] [AD]

Are you planning to visit anywhere abroad in the future?

Does your trip include visits to countries other than Guam?

What is your budget?

  • Basic power adapters start from under £10 to power only one single device in Guam (providing that works with 110 volts or it is dual voltage) but paying roughly £15-£20 means you can power multiple devices at once and use them in multiple countries.

Would you like to use your charger when returning to the UK?

Do you bringing just hand luggage to Guam?

Are you only using hand luggage

Do you bringing just hand luggage to Guam?

Will it take you a long time to fly to Guam?

Arriving at an airport

Will it take you a long time to fly to Guam?

  • If you're taking an extended flight to get to Guam think about an appropriate airport-friendly power charger that works in different outlet types, one that can be carried in hand luggage and can be used to quickly top up phones and tablets prior to a long haul journey.
  • As not all planes and airports have power outlets please think about bringing a battery portable charger for recharging on the go. When you land you could have to rely on a mobile phone for making calls, sending texts, using mapping or recalling an itinerary; therefore it is recommended that your phone has ample power left. [4] [AD]

What can I connect to a Guamanian power outlet

Travel appliances that can plug into a Guamanian power outlet

Beats Pill speakers which can connect to a Guamanian power outlet

Jabra Bluetooth speakers which are compatible with a Guamanian power outlet

Mobile phones which work with the Guamanian power outlet

Apple iPhones which can be connected to a Guamanian power outlet

Samsung Galaxy phones that can connect to a Guamanian power outlet

Amazon Kindle tablets which can connect to a Guamanian power outlet

A list of Apple iPads which are compatible with a Guamanian power outlet


We endeavor to ensure all details on this page are correct and relevant to travellers visiting Guam, if you wish to contribute any useful information or feedback please email For more comprehensive technical details visit the Wikipedia page on AC power plugs and sockets[22]


WikiConnections is not responsible for any injury or damage caused due to using any type of suggested product with any other electrical device or appliance in any location, full details are available on the disclaimer page. While WikiConnections strives to make the information on this website as timely and accurate as possible, we make no claims, promises, or guarantees about the accuracy, completeness, or adequacy of the contents of this site, and expressly disclaim liability for errors and omissions in the contents of this site. All functions and capabilities should be checked prior to purchasing or using any power adapter. Assumptions on if any power adapter, charger, converter or power strip works in any location is based on data from publicly available sources and if it fits the primary power outlet used in that country. WikiConnections has not taken into consideration other less common power outlets which might be found as these might only be used in certain areas or in the process of being phased out.

Where possible, WikiConnections only recommends the type of product as being suitable along with alternatives and does not make any endorsement for any specific brand or product. Always check with the manufacturer to ensure full compatibility prior to attempting to use any device. Always check the reputation of the manufacturer and product to ensure the quality and safety of any electrical device being used.

We endeavour to ensure that links on this page are periodically checked and correct for suitability. This website may receive commissions for purchases made through links on this page. As an Amazon Associate WikiConnections earn from qualifying purchases. For more details please read the disclaimers page.

  1. Wikipedia - Guam country Wiki page.
  2. - International Electrotechnical Commission World Plugs
  3. Type B plug adapter - US and Japanese 3 pinned Type B plug adapters have a single unearthed round pin along with 2 shorter parallel rectangular flat blades containing holes in each blade, costs around £4
  4. Portable charger - A power bank is a portable charger which can recharge USB powered devices such as mobile phones and tablets on the go, £25-£30.
  5. Wikipedia - power adaptor
  6. Travel power strip - A travel power strip includes surge protectors, AC power outlets, USB ports and swappable plug adapters for use in multiple countries, priced under £40
  7. 4 Port USB Wall Charger - A universal USB charger capable of charging up to 4 USB devices with swappable international adapters, £10-£15
  8. Universal travel power adapter - A typical universal travel power adapter can be used in over 150 different countries for use with appliances and USB devices, around £15
  9. Plug adapter set - Plug adapter set containing a number of different power plug adapters for use in different countries, estimated cost £5-£10
  10. Step up power converter - A step up power converter allows a 220-240 volt appliance to be used in a 100-120 volt power outlet, costing under £90
  11. Wikipedia - WikiPedia - Mains electricity by country -
  12. Rechargeable hair dryer - Rechargeable battery powered cordless blow dryer suitable for travelling, estimated cost £70-£80.
  13. Gas hair straighteners - Cordless ceramic hair straighteners powered by gas cartridges, costing £20-£25.
  14. 10,000mAh portable charger - Lightweight 10000mAh high-speed portable USB charger suitable for mobile phone charging, £20-£25.
  15. 20,000mAh portable charger - High capacity 20000mAh high-speed portable USB charger suitable for charging mobile phones and some tablets for several days, £25-£30.
  16. USB-C PD power bank - Power Delivery charger suitable for charging laptops with USB-C support, priced at £100-£110.
  17. Solar backpack - A solar backpack will charge USB devices or an internal power bank when left in sunlight, under £100
  18. Solar power bank - Portable power bank with solar cells which can recharge when placed in sunlight to power any USB powered device, estimated price under £35.
  19. Power converter - A step up step down power converter converts 110-120 volts up to 220-240 volts and 220-240 volts down to 110-120 Volts, £100-£110
  20. Heavy duty power converter - A 5000 watt heavy duty step up and step down power converter used to convert voltages for domestic appliances, power tools, televisions, heating appliances and motors, estimated cost £100-£110.
  21. Step down power converter - A step down power converter allows a 100-120 volt appliance to be used in a 220-240 volt power outlet, £80-£90
  22. Wikipedia - AC power plugs and sockets -