JNTO lists Type A outlets. Type B appears in other technical references but is not guaranteed in every room. Japan uses nominal 100V and regional 50/60Hz.
The key check
JNTO lists Type A outlets. Type B appears in other technical references but is not guaranteed in every room. Japan uses nominal 100V and regional 50/60Hz.
| Destination | Voltage | Frequency | Plug reference |
|---|---|---|---|
| Japan | 100V | 50/60Hz | Type A, Type B |
What changes the answer
JNTO presents Type A as the traveler outlet reference; Type B appears in other technical lists but should not be assumed in every hotel room. For a US charger, familiar-looking blades can make Japan seem straightforward. The limiting question is still the charger's INPUT range: Japan's 100V is below the US nominal 120V. A charger marked 100–240V may cover it; a 120V-only appliance does not gain that range from a plug adapter. For frequency-sensitive equipment, check whether your stops are on the eastern or western grid.
Example: one US appliance across these stops
Suppose a charger is actually labeled INPUT 100–240V 50/60Hz. Its voltage and frequency fields include the displayed 100V candidates, but you still need a verified plug route, earth if required and sufficient AC rating. A 120V-only appliance cannot be cleared from this comparison for Japan. This is an illustrative label comparison, not a tested product recommendation.
Use this before plugging in
- Find the AC INPUT label on the exact appliance or power brick. Write down the stated voltage and frequency range.
- Confirm the actual destination outlet voltage and socket variant; a country reference cannot tell you what a particular room has.
- Trace the physical plug and protective earth through each adapter. Read the lowest AC current rating in the chain.
- If a condition is missing or the maker excludes the appliance, leave the setup unconnected and seek a rated alternative.
Common shortcut to avoid
A familiar plug shape or a broad USB wattage claim is not a substitute for AC voltage, grounding and load checks. The distinctions in the table above are screening data; they do not certify a particular hotel outlet or product.
Use the device checker · Japan profile
Questions travelers still ask
Can a 100–240V 50/60Hz charger use these nominal supplies?
Those AC input numbers cover the displayed 100V and frequency references, but the wall plug, earth path and current rating remain separate checks.
Will one adapter head cover all these stops?
Not from the country lists alone. The observed plug families include Types A, B; ask each property which exact sockets are installed.
What about a 120V-only appliance?
Do not clear it automatically for Japan. Compare its exact label with the supply at the specific outlet and seek maker guidance if they differ.
Sources and scope
Japan National Tourism Organization , Bel Fuse , Electrical Safety First . Research reviewed 2026-11-01; no outlet measurement or hands-on product test. Send a correction