Guam power adapters - what plugs are used in Guam?

Guamanian power outlet

What adapter do I need for Guam?

The type of power adapter, power converter or charger that you'll need to bring 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 do not know which voltage your device uses then read the section on 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 [3]. 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 is unable to use 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 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 your USB devices such as a cell phone or a tablet then a USB travel power adapter will be more suited and it should work with any voltage, but make sure that you bring one which includes a Type B plug adapter otherwise you will also need to pack a suitable plug adapter for Guam.

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

Background

Various voltages and sockets can all be confusing when planning to travel to a different country, especially for the first time traveller. With only a handful of different types of standards being used throughout the world this article tells you exactly what you'll need in advance to power your electronics in Guam. This page has links to useful instructions demonstrating exactly how to power your devices when you are in Guam using their Type B or A Guamanian 110 volt 60Hz wall outlets. You'll find power sockets differ regionally so please read the power adapters page for a complete list of countries. We recommend reading the Guam Wikipedia page [1] for more information.

Guam power adapters

What is the best power adapter for Guam?

The best power adapter for Guam will be a Type B power adapter [3] which is suitable for powering any 110 volt appliance or device.

What is the best power adapter for Guam?

What is a power adapter?

A power adapter for Guam is a small and lightweight plastic adapter that allows a power plug from a foreign country to correctly fit into a power outlet in Guam.

Also known as: an electrical adapter, plug adapter, travel adapter, electrical adaptor, mains travel adapter or power adaptor [4].

Do I need a plug adapter for Guam?

It will depend on where you are travelling from and the type of plug you are attempting to use.

What does a power adapter for Guam do?

A power adapter allows visitors from another location to use their electrical appliances in Guam by altering the shape of the plug from one type to another.

Do I need a power adapter for Guam if I'm visiting from the US?

A US plug does not need an adapter as it will fit into a Guamanian power outlet.

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

Power adapters only adapt the shape of a plug to fit into a 110 volt Guamanian power outlet and doesn't convert the power to a higher voltage. Should you need to safely use any 220, 230 or 240 volt appliance you also need to bring a more expensive step up power converter along with the correct type of power adapter.

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 types of power outlets used in Guam, types B and A with the primary power supply being type B:

  • Plug Type A - You can recognise this wall outlet by two thin adjacent slots next to each other.
  • Plug Type B - You can recognise the plug socket by 2 slots next to each other where the short live and neutral plug socket blades go with a single hole below for the long earthed pin.

What is the voltage from a Guamanian power outlet?

The typical voltage from a Guamanian power outlet is 110 volts.

Do US plugs work in Guam?

Yes, an American plug will work in Guam without a power converter or plug adapter.

What is the frequency used in Guam?

The frequency of the current used in a Guamanian power outlet is 60 Hz.

Is a Guamanian power outlet the same as the US?

An American plug will fit into power outlets used in Guam, the frequency and voltage range are both the identical to the US.

How do I use a 220 volt appliance in Guam?

To use a 220V, 230V or 240V appliance in Guam you need a step up power converter.

Is the voltage in Guam the same as in the US?

120 volts is used in America but the voltage from a Guamanian power outlet is 110 volts. Even though these are similar check the voltage on your US appliance or charger supports voltage fluctuations between 100-127 volts or that it can handle dual voltage.

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 [6]. 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 iKits 4 Port USB Wall Charger [6] which has been tested successfully for recharging multiple USB devices in numerous different countries.

What USB charger do I need for Guam?

Why use a travel USB charger for Guam?

  • Normal travel USB chargers include 4 or more USB charger ports, this means that you should only need to bring one charger to charge multiple devices. Rather than bring 4 individual power chargers it's now only necessary to pack one 4 port USB wall charger to power up to 4 separate devices which cuts down on the weight and size of your luggage.
  • Travel USB chargers include interchangeable plug heads for different regions. This is perfect when visiting other countries which are likely to use different power outlets to Guam.
  • A good charger is rugged, lightweight and compact; perfect for rigors of travel rather than risking bringing a domestic charger which could be impossible to repair or replace in Guam.
  • USB travel chargers can accept the 110 volt power outlets in Guam plus different voltage standards in other countries.
  • It is possible that some hotels in Guam only have a single wall outlet, by using a travel charger with multiple USB ports means you can share the single wall outlet with all your devices instead of waiting to charge each device one by one.
  • Because of their flexible nature they take the worry out of visiting any unknown country as they are guaranteed to work almost anywhere in the world.
  • Power outlets found in airports are often in short supply and demand for charging multiple devices from other passengers during departure can be high, therefore a USB travel charger with multiple ports and the capability to charge quickly is ideal.
  • Some countries power grids are unstable, a travel USB charger allows for unexpected surges to prevent damage to any devices connected to it. Trying to repair an overloaded smartphone in Guam might prove to be difficult and costly.
  • Premium USB chargers also feature power outlet strips to use multiple low wattage domestic appliances such as laptops, but please these are unsuitable for high wattage domestic such as hair dryers or clothes irons. See our section on using travel appliances in Guam for advice on the most suitable power adapter for a high wattage appliances in a Guamanian power outlet.
  • Some mobile phones could pull more than the standard 500 mA supplied by a normal 5 volt USB adapter to charge or provide fast charge. Ensure that the USB power adapter can support fast charging should any of your devices require additional power.
  • When returning home travel USB power chargers can also be useful by charging multiple cellphones and tablets every night using one power outlet.

What is the best USB charger for Guam?

The 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.

Power converters for Guam

What is a power converter?

Power converters enable you to use a 220, 230 or 240 volt electrical appliance 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?

A lightweight, cheap and small power adapter [7] (or plug adapter) changes the shape of the plug on your device to fit into a power outlet found in Guam, but a more expensive and heavier power converter [8] transforms a 110 volt Guamanian power outlet to work with a non-110 volt device.

Do I need a power converter for Guam?

When you are travelling to Guam from another country please ensure that the device will accept a 110 volt power supply.

  • You need a step up power converter [9] if you are travelling to Guam from a country that uses 220-240 volts and your appliance or device won't support 110 volts. Read our world power outlets guide to discover which 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.
  • Electrical devices which originate from a country which use a higher voltage (such as 230 volts) and used in a 110 volt outlet either take longer to charge or simply won't power up. If your device charges slowly or does not power up when visiting Guam from a different region check that it can be used with a 110 volt Guamanian power outlet otherwise you will need to use a step up power converter [9].
  • You shouldn't need a power converter if you wish 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 prior to your journey.
  • For powering high wattage appliances or generate heat (such as hair dryers or curling irons) then you will need to use a much larger higher wattage heavy duty power converter [10].
  • Buying a robust lightweight dual voltage travel appliance will be more cost effective and practical than trying to bring a much heavier high wattage power converter in order to use your existing domestic appliance in Guam.
  • Read our guides on using clothes irons, curling irons, hair dryers and flat irons in Guam which includes guides on affordable dual voltage alternatives.

Do I need a power converter if I'm visiting Guam from America?

You won't need to use a power converter as the voltage in Guam is in the same 100-120 volt range as the US.

What kind of converter do I need for Guam?

In order to use any 220-240 volt appliance with a 110 volt Guamanian power outlet you need a step up power converter [9].

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 [9] 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.

What voltage is used in Guam?

Guam uses 110 volts in their standard power outlets.

What voltage is my appliance?

Single voltage hair dryer

What voltage is my appliance?

The best way to tell if your device is dual voltage is to look for either a sticker or numbers printed on the supplied charger or on the unit itself, typically on the rear or near to where the power cord goes. This location might vary depending 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.

What can I connect to a Guamanian power outlet?

Travel appliances that can connect to 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

A list of Amazon Kindle tablets which can connect to a Guamanian power outlet

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

Corrections

We endeavor to ensure all details on this page are correct and relevant to travelers visiting Guam, if you wish to contribute any useful information or feedback please email travel@wikiconnections.org. For more comprehensive technical details visit the Wikipedia page on AC power plugs and sockets [12].

  1. https://en.wikipedia.org/wiki/Guam - Guam country Wiki page.
  2. http://www.iec.ch/worldplugs/ - International Electrotechnical Commission World Plugs
  3. Type B plug adapter - Allows appliances to connect to Type B power outlets without converting voltage.
  4. https://en.wikipedia.org/wiki/Adapter - power adaptor
  5. https://en.wikipedia.org/wiki/Mains_electricity_by_country - WikiPedia - Mains electricity by country
  6. IKits 4 Port USB Wall Charger - A universal USB charger capable of charging up to 4 USB devices with swappable international adapters.
  7. https://www.amazon.com/Ceptics-GP-12PK-International-Worldwide-Universal/dp/B01DJEBLQU/ref=as_li_ss_tl?_encoding=UTF8&psc=1&refRID=CFDDSXZJ59CH648AVQ0H&linkCode=ll1&tag=wikiconnections-20&linkId=b865b6ca5e535d710bf1e1b3a790f622 - power adapter
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets - AC power plugs and sockets