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SESK: Stuff Everyone Should Know · sesk.info/wt-japan-100-volts

What voltage do wall outlets supply throughout Japan?

Japan uses 100 volts everywhere.

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  1. 230 volts
  2. 100 volts ✔
  3. 240 volts

Why: Japan's power is 100 volts AC across the whole country. Some appliances need a step-down transformer, so check the label before you plug in.

Huh, didn't know that: Electronics districts such as Tokyo's Akihabara sell plug adapters and transformers.

The dad joke
Japan runs on 100 volts, which is still more energy than I have after a 14 hour flight.
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References

Answer: 100 volts. Japan's power is 100 volts AC across the whole country. Some appliances need a step-down transformer, so check the label before you plug in.

  1. Plugs and electricity (Japan National Tourism Organization) www.japan.travel/en/plan/plug-and-electricity
    The voltage used throughout Japan is uniformly 100 volts, A.C.
    Checked 2026-10-12.

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