Power adapter guide
Power adapter for Japan: plugs and voltage
What plug and voltage Japan uses, whether you need an adapter or a converter, and what to bring.
By Cara Laban, founder of TravelReddi. Last checked October 2026.
Do you need a power adapter for Japan?
It depends on the plugs you use at home. Where do you live?
Japan uses plug types A, B, and your plugs from the United States fit the main sockets, so you probably do not need a plug adapter. Sockets can vary, especially in older buildings, so check if you are unsure.
The voltage here is 100V, close to 120V at home, so your devices should work as they do at home.
Electricity in Japan
- Plug types
- A, B
- Voltage
- 100V
- Frequency
- 50/60Hz
What the plugs look like
Type A: two flat parallel pins.
Type B: two flat parallel pins and a round grounding pin.
These are the main plug types. Sockets can vary between buildings, especially older ones. For the official list, see the IEC, World Plugs.
Good to know in Japan
Japan has the lowest voltage in the world. Most modern electronics handle 100-240V. Older devices may charge slowly.
Adapter or converter?
An adapter only changes the shape of the plug so it fits the socket. A converter also changes the voltage. Most phone, tablet and laptop chargers handle different voltages on their own, so for those you only need an adapter. Check the label on each charger for a range such as 100-240V.
What to bring
One adapter with several USB ports can charge your phone, tablet and earbuds together. Check that the one you choose fits plug types A, B.
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Common questions
What is the difference between an adapter and a converter?
An adapter only changes the shape of the plug so it fits the socket. A converter also changes the voltage. Most phone and laptop chargers handle different voltages themselves, so they only need an adapter.
How do I know if my device can handle the voltage?
Look at the small print on the charger or the back of the device. If it lists a range that includes the voltage in Japan, such as 100-240V, it will work with just a plug adapter. If it lists one number that does not match, you would need a converter.
Can I bring my hair dryer?
Hair dryers and other heating tools often work at only one voltage, so check the label first. If it does not cover the local voltage, using it can damage it or be unsafe. Many hotels have hair dryers, so it can be easier to leave yours at home.
Do I need one adapter per device?
No. One adapter with several USB ports can charge a phone, tablet and earbuds at once. Make sure it fits the plug type used where you are going.
Planning more for Japan?
Getting ready for Japan?
Our Japan guide covers entry rules, money, transport and more, matched to your passport.
Open the Japan guideThis guide is general information. Check the label on your own devices before you plug them in abroad.