Short answer: Japan uses Type A (two flat pins) and Type B (two flat pins plus a round earth pin) sockets, the same shapes used in the United States and Canada. Mains power is 100 V, a little lower than North America’s 120 V, and the frequency is 50 Hz in the east and 60 Hz in the west.
Who needs an adapter?
| Travelling from | Plug adapter | Voltage |
|---|---|---|
| United States, Canada | Usually not (see the note on older sockets below) | 120 V at home vs 100 V: most devices are fine |
| UK, Ireland | Yes: Type G to Type A | 230 V at home: check every device |
| Germany and most of the EU | Yes: Type C/F to Type A | 230 V at home: check every device |
| Australia, New Zealand | Yes: Type I to Type A | 230 V at home: check every device |
| India | Yes: Type C/D/M to Type A | 230 V at home: check every device |
Older two-slot sockets
Many Japanese sockets, especially in older buildings and homes, have just two slots of the same width and no earth hole. Two things from North America can fail to fit them:
- Three-prong plugs (Type B), such as many laptop power bricks with an earth pin.
- Polarised two-prong plugs, where one blade is wider than the other.
A small, inexpensive 3-to-2 or non-polarised adapter solves both. Hotels aimed at international guests often have some modern sockets, but it is worth packing one.
100 V: what actually works
Look at the INPUT line on each charger or device label:
- “100–240V ~ 50/60Hz”: works anywhere in Japan with only a plug adapter (if your plugs differ). This covers almost all phone, tablet, camera and laptop chargers.
- “120V” only (North American devices): most electronics cope with 100 V. Heating appliances such as hair dryers and straighteners run but produce noticeably less heat.
- “220–240V” only (UK, EU, Australian, Indian devices): will not work properly on 100 V. You need a step-up voltage converter rated above the device’s wattage, or a dual-voltage or locally bought appliance.
50 Hz vs 60 Hz
The east–west split dates back to the first generators imported in the 1890s. Modern chargers and electronics do not care. A few older appliances with motors or clocks that keep time from the mains can run slightly fast or slow; if a label says “50/60Hz” you can ignore the difference.
Quick answers
Do I need a plug adapter for Japan from the US or Canada?
Usually not. Japan uses the same Type A and Type B plug shapes. Older two-slot sockets may not take a three-prong plug or a polarised plug with one wider blade, so a small 3-to-2 or non-polarised adapter is useful.
Do I need a plug adapter for Japan from the UK, Europe or Australia?
Yes. You need an adapter to Type A (two flat parallel pins).
What voltage is used in Japan?
100 volts. The frequency is 50 Hz in eastern Japan, including Tokyo, and 60 Hz in western Japan, including Osaka and Kyoto.
Will my phone or laptop charger work in Japan?
Almost certainly. Most phone, tablet and laptop chargers are rated for 100–240 V and 50/60 Hz. Check the INPUT line on the charger.
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