βINPUTβ is printed on the label of the charger, AC adapter or the product itself. Plug drawings show the general shape only.
This is for traveling from Japan to Guam. The data is the IEC list (as of June 2025). Some places or buildings may use other types, so treat it as a guide.
| Voltage | Frequency | Plug types | |
|---|---|---|---|
| Guam | 110V | 60Hz | A, B |
| Japan (for comparison) | 100V | 50 / 60Hz | A, B |
Same as Japan: Guam uses types A, B, the same types as Japan (A, B) in the IEC list.
Source: IEC (International Electrotechnical Commission) World Plugs country list (as of June 2025). The IEC no longer publishes this list, so a copy is kept on this site (retrieved 2026-09-27)
PR Example USB charger for overseas voltages (Japanese online stores)
Same plug types as Japan: a charger rated 100-240V is all you need
input 100-240V, 4 USB-A ports, labeled "PSE certified". Depending on your destination, a plug adapter is needed separately.
input AC100-240V, 3 USB-A ports, labeled "PSE certified". Depending on your destination, a plug adapter is needed separately.
| "INPUT" on the product | Result |
|---|---|
| INPUT 100-240V | Voltage: Guam uses 110V. Within the label (100β240V) β no transformer needed |
| INPUT 100V only | Voltage: Guam uses 110V. Outside the label (100V) β do not use it as is. Use a product that supports the voltage in Guam, or use a transformer (check the transformer's manual for which products and wattage it supports) |
Check the "INPUT" label on the charger, AC adapter or the product itself. For hair dryers and irons, see Taking a hair dryer or hair iron abroad; for plug shapes, see How to tell plug types A to N apart.
Source: IEC (International Electrotechnical Commission) World Plugs country list (as of June 2025). The IEC no longer publishes this list, so a copy is kept on this site (retrieved 2026-09-27)
Apart from what you can take on the plane, Guam has its own rules for what you bring in when you arrive. Only the points most relevant to travelers are listed here.
Tap an item to see the rule.
Meat and processed meat products
Prohibited
Fruit, plants, and animal and plant products
Strictly inspected and may be confiscated. Tortoiseshell products are prohibited, and bringing in animals requires a permit
Alcohol
Adults: up to 1 gallon (about 3.7 liters) duty-free
Tobacco
Adults: up to 1,000 cigarettes (5 cartons) duty-free. Smoking is allowed from age 21
Cash, etc.
There is no limit on the amount, but cash and securities totaling the equivalent of US$10,000 or more must be declared. False declarations or failure to declare can lead to penalties such as confiscation
Narcotics, firearms, explosives, etc.
Prohibited
Customs declaration
A digital customs declaration form (EDF) has been introduced. Fill it in on the Guam Customs website within 72 hours of arriving in Guam to get a QR code to show at immigration
The Ministry of Foreign Affairs of Japan describes its page as reference information and recommends checking the latest details with the U.S. Embassy, the Guam Visitors Bureau and others. Check before you go.
For the duty-free allowance when you return to Japan, see Duty-free allowance when returning to Japan.
Handy to have before you go
PR Example travel bottles (Japanese online stores)
For liquids in the cabin on international flights: containers of 100ml or less
capacity 60ml, 1 bottle, polyethylene and polypropylene.
a set of 5 bottles; choose from 30ml, 50ml or 100ml.