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

What voltage do wall outlets in Japan supply?

100 volts, close to the US 120 volts, and most US plugs fit without an adaptor.

Start playing free

  1. 220 volts
  2. 240 volts
  3. 100 volts ✔

Why: Japan runs on 100 volts, close to the 120 volts used in the US. The US trade agency says most US appliances do not even need a plug adaptor there.

Huh, didn't know that: The trade agency says appliances from Europe, Australia or Southeast Asia need an adaptor in Japan and may need a transformer.

The dad joke
What is an outlet's favorite song? "I've Got the Power."
Like this card?
Play the game

References

Answer: 100 volts. Japan runs on 100 volts, close to the 120 volts used in the US. The US trade agency says most US appliances do not even need a plug adaptor there.

  1. International Trade Administration: Japan Business Travel www.trade.gov/country-commercial-guides/japan-business-travel
    Japan uses an electric current of 100 volts, and a frequency of 50 Hertz in eastern Japan, or 60 Hertz in Western Japan
    Checked 2026-10-10.
  2. International Trade Administration: Japan Business Travel www.trade.gov/country-commercial-guides/japan-business-travel
    most U.S. appliances do not require an adaptor
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

TravelA US appliance made only for 110V goes to the UK, where outlets give 240V. What does it need?TravelYour phone charger's label says Input 100-240V. What do you need to use it in Europe?TravelYou finish a great dinner in Tokyo. What is the local custom about tipping?

That's stuff everyone should know.