Guam Power Plugs, Wall Sockets & Electrical Outlets
In Guam, power plugs and sockets (electrical outlets) of Type A (NEMA 1-15, two flat parallel pins, ungrounded) and Type B (NEMA 5-15, two flat parallel pins plus round grounding pin, grounded) are used. Wall sockets run at 110V and 60Hz. Check if you need a travel adapter, electrical adapter or voltage converter before travelling to Guam.
Check Adapter Compatibility
Do you need an adapter for your trip?
Guam uses:
Electrical Standards in Guam: Voltage, Frequency & Plug Type
Guam power plug standards follow the North American system, since the island uses the same electrical infrastructure as the United States. Homes, hotels, and businesses in Guam are fitted with Type A and Type B sockets, so visitors arriving with US-style plugs will find their devices fit directly into the local electrical outlet without any adaptation needed.
Voltage and Frequency in Guam
Guam operates on a 110V electrical system at a frequency of 60Hz, matching the standard used across the United States. This means travelers from North America can use their electronics without concern, while visitors from countries with 220-240V systems will need to check their device compatibility before plugging in.
The two plug types found in Guam are Type A (NEMA 1-15), an ungrounded two-pin plug rated for 15A at 100-127V, and Type B (NEMA 5-15), its grounded three-pin counterpart. Type B plugs add a round grounding pin alongside the two flat parallel blades, offering additional protection for larger appliances, computers, and power tools. Since Type B outlets also accept Type A plugs, most standard electronics and small devices will work seamlessly with either socket-outlet configuration found on the island.
Guam Travel Adapter Guide
Travelers coming from the US, Canada, Mexico, or other countries using Type A or Type B plugs will not need an adapter in Guam, as the plug shapes and socket-outlet designs are identical. Visitors from regions using different plug standards, such as Europe, Australia, or the UK, will require a plug adapter to convert their 3-pin plug or two-pin plug into a shape compatible with Guam's outlets.
Is a Voltage Converter Necessary?
A voltage converter is generally unnecessary for travelers from North America, since Guam's 110V/60Hz supply matches the standard used in the US and Canada. Visitors from countries operating on 220-240V systems should check whether their devices are dual-voltage before use, as appliances designed only for higher voltages may require a converter to operate safely on Guam's electrical outlet system.
- Type A (NEMA 1-15): ungrounded, two flat parallel pins, 15A, 100-127V
- Type B (NEMA 5-15): grounded, two flat pins plus round grounding pin, 15A, 100-127V
- Voltage: 110V, Frequency: 60Hz
- No adapter needed for US, Canadian, or Mexican plug types
- Adapter required for European, UK, Australian, and most other international plug types
Frequently Asked Questions
If you're traveling from the US, Canada, or another country that uses Type A or Type B plugs, you won't need an adapter in Guam. Travelers from countries with different plug standards, such as Europe or Australia, will need an adapter to fit Guam's Type A and Type B sockets.
Guam uses Type A (NEMA 1-15) and Type B (NEMA 5-15) plugs, the same standards found throughout the United States. Type A is an ungrounded two-pin plug, while Type B is a grounded three-pin plug rated for 15A at 100-127V.
Many electrical outlets in Guam are grounded Type B sockets, which accept a 3-pin plug featuring two flat blades and a round grounding pin. However, ungrounded Type A outlets with just two flat pins are also common, particularly for smaller devices and appliances.
Yes, phone chargers are typically dual-voltage and designed to handle a range of electrical inputs, so they will work fine on Guam's 110V, 60Hz supply without a converter. Simply plug your Type A or Type B charger directly into the socket-outlet, since Guam's system matches standard US voltage and plug types.
