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Guam Plugs, outlets & travel adapters
Guam uses Type A and B sockets. The mains supply is 110 V at 60 Hz.
Plugbert's take American-style socket families. Check the outlet, grounding and device rating before plugging in.
Do you need a travel adapter for Guam?
It depends on where your plugs come from.
🇺🇸 From the United States
Your plugs fit some compatible outlets in Guam, but not every listed socket design. An adapter may be needed for the outlet you encounter. Check the actual outlet and preserve any grounding your device requires; hybrid connections may not be grounded.
Guam uses 110 V and the United States uses 120 V, but similar nominal voltages do not guarantee compatibility. Check that your device's input rating covers the destination supply.
United States to Guam in full🇬🇧 From the United Kingdom
You need a plug adapter. Plugs from the United Kingdom (Type G) don't fit the Type A and B sockets in Guam. A Type A (US 2-pin) adapter fits the listed socket families there. For grounded devices, get a Type B (US 3-pin) adapter for a compatible grounded outlet instead; it does not fit every listed outlet. Socket variants can differ; check the actual outlet and adapter rating.
Guam uses 110 V, lower than the 230 V in the United Kingdom. An input rating of "100–240V" covers the listed supply voltage; you still need a suitable plug or adapter. Single-voltage devices may run weakly or not at all.
United Kingdom to Guam in fullFrom other countries
Somewhere else?
Sockets you'll find in Guam
Will your devices work in Guam?
Sockets in Guam supply 110 V. Find the "input" line on each device or its charger. An input rating of "100–240V" covers the listed supply voltage; you still need a suitable plug or adapter. Check that the input frequency also covers 60 Hz. An adapter changes the plug shape, not the voltage or frequency. For switchable devices, follow the manufacturer's instructions before plugging in.
Often rated 100–240 V; confirm on the charger: phone charger, laptop charger, camera battery charger.
Check the label first: electric toothbrush, electric shaver, CPAP machine, hair straightener / curler.
Usually single voltage: hair dryer, kettle / coffee maker, anything with a heating element.
Plug twins
These countries list the same plug types and a similar voltage range. Check each guide for socket variants and local exceptions.