Japan is listed with 100V nominal AC supply, 50/60Hz, and Type A, Type B in the reviewed travel references. These figures describe a destination profile, not the outlet in your room. Source differences or regional conditions require extra confirmation before connecting a single-voltage device.
Before plugging in
The reference lists several plug families. That is a list of observed formats across sources, not a guarantee that every building has them. Frequency varies by region or is unresolved in the collected references; check the location and device label. Japan National Tourism Organization identifies 50Hz in eastern Japan and 60Hz in western Japan.
Japan voltage, frequency and plug types
| Voltage reference | 100V |
|---|---|
| Voltage mode | nominal reference |
| Frequency | 50/60Hz |
| Plug families | Type A, Type B |
| Voltage evidence | local primary reference |
| Frequency evidence | local primary reference |
| Plug evidence | manufacturer and safety references |
| Profile review | local electrical reference with socket caveats |
| Territory of | Not applicable |
Illustrations show broad family shapes only. They are not dimensioned drawings or a fit test.
A plug letter identifies a shape family. It does not establish the supply voltage, the exact subvariant, the condition of the wall socket, or a working protective earth. Nominal values can differ from the actual supply at a particular property.
What changes for a US traveler?
A US appliance marked 120V only does not cover every 100V reference candidate. Do not use a plug adapter to bridge that electrical mismatch. The reference shares Type A, Type B with US plug families, but the exact male-to-socket variant and the property installation are still unverified. The reference includes 50Hz or an unresolved frequency, so a US 60Hz-only appliance needs a specific frequency check.
- Frequency differs by region; check the exact stop and the device frequency rating.
Why some charts disagree
The values below are retained as a research conflict, not silently averaged into a new national standard. An outlet-specific answer matters most for a single-voltage device.
| Field | Values reported | References |
|---|---|---|
| frequency | [[50], [50, 60]] | Bel Fuse , Electrical Safety First , Japan National Tourism Organization |
Japan research note
Japan National Tourism Organization identifies Type A outlets and a uniform 100V supply, with 50Hz in the east and 60Hz in the west. Type B appears in other technical and safety references, but a grounded Type B socket is not guaranteed in every room.
Check your device label
Find the INPUT line on the item that actually connects to AC power. Confirm its voltage range includes the local supply, its frequency rating includes the local frequency, and its plug and grounding requirements are met. A USB output rating such as 65W is not the AC input rating.
| Device | Check before use |
|---|---|
| Phone and tablet chargers | If the actual charger says INPUT 100–240V 50/60Hz, the listed 100V and 50/60Hz values are inside those two ranges. Check its wall plug and USB profile separately. |
| Laptop supplies | Inspect the brick and detachable cord. A Type A/B country listing does not verify a Class I earth path in your room. |
| Cameras and small chargers | Read the battery charger’s AC INPUT, not the camera body. A 120V-only label cannot be cleared for 100V without a maker-approved solution. |
| Hair dryers and heated tools | A US 120V-only heating appliance is outside at least one 100V candidate; a shape adapter is not a converter. |
| Medical and CPAP devices | Ask the maker and care team to compare the exact power supply with 100V and 50/60Hz; plan a backup rather than relying on a country-level safe-use verdict. |
Screen your device for Japan · Compare from your home country
What adapter type should you look for?
Start with an adapter that explicitly accepts your device’s actual plug and has an output plug matching the outlet shown by your accommodation. Check the adapter’s AC current rating, permitted appliances and earth continuity. A universal adapter can have several pins yet lack protective earth. A shape adapter cannot step voltage up or down.
For Japan, research Type A or Type B. Do not buy solely from this country-level listing; ask the property about the exact socket variant first.
- Dedicated destination head: investigate one that names the exact wall socket variant and your device plug.
- Grounded route for Class I equipment: require documented protective-earth continuity from the wall through the adapter.
- Documented universal model: useful for several stops only when every required variant and the AC load are supported.
Travel questions for Japan
Will a US plug connect directly in Japan?
The country list includes Type A, Type B, also seen in US references. Direct fit still depends on the exact variant, outlet and grounding.
Can I use a device marked 120V only?
Not from the 100V reference alone. At least one candidate is outside a 120V-only label; ask the property and product maker before connecting it.
What should I confirm with the property?
Ask for the voltage and a photo or exact name of the outlet you will use. The local electrical reference with socket caveats research status and Type A, Type B listing do not verify every room or a working protective earth.
Evidence and limits
Voltage references: Japan National Tourism Organization . Frequency references: Bel Fuse , Electrical Safety First , Japan National Tourism Organization , MAG Kabel , MENNEKES . Plug references: Bel Fuse , Electrical Safety First , MAG Kabel , MENNEKES , Panasonic . Reviewed 2026-11-01; no on-site outlet or product test was performed.
The research record marks this profile as local electrical reference with socket caveats. If sources disagree, the screening tool requests local confirmation rather than treating a nominal reference as a safety certificate. Report a correction
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