Japan Power Plugs: Plug Type, Voltage and Your Devices

JGO! editorial team — WEBMARKS Inc. (Fujisawa, Kanagawa)

Japan uses Type A power sockets: two parallel, flat pins. The standard supply is 100V AC, and the frequency is 50Hz in eastern Japan and 60Hz in western Japan. Before packing, check the plug shape and the input information on each device: if its label says 100–240V, it will usually need only a plug adapter to fit a Japanese socket; if it lists a narrower range, it may also need a voltage converter. JNTO’s electricity guide and Kashimura’s guide to choosing transformers and plug adapters explain these basics.

What Japanese plugs and sockets look like

JNTO describes Japanese sockets as using Type A plugs, with two flat pins side by side. If your plug has a different shape, you may need an adapter so it can fit the socket; an adapter changes the shape of the connection, not the electricity supplied to your device. See JNTO’s plug and electricity information and its visitor guide description of the plug shape.

Check the plug itself before you travel, rather than relying only on the country where you bought the device. The relevant question is whether the plug can connect to the Japanese two-flat-pin socket; a plug adapter may be needed if it cannot. A physical fit is only one part of the check, however: you must also confirm that the device is compatible with Japan’s voltage and frequency.

The two-pin description does not establish that every plug with a similar appearance will work safely or be supported by its manufacturer. For example, Elecom says that its Japan-domestic power products are not guaranteed for overseas use even if a product label shows 100–240V. The label is important, but check the manufacturer’s instructions for the particular product as well. Elecom’s guidance on overseas use is a useful reminder not to treat a voltage marking as blanket approval.

Voltage and frequency: 100V, 50Hz or 60Hz

Japan’s standard supply is 100V AC. The frequency differs by region: eastern Japan uses 50Hz and western Japan uses 60Hz, according to JNTO. JNTO gives Nagoya, Kyoto and Osaka as examples of cities in the 60Hz area; do not assume that the frequency is identical everywhere in Japan. Refer to JNTO’s electricity guide for the national overview.

If you will use an overseas product in the Tokyo Electric Power Grid transmission and distribution area, TEPCO advises checking that it supports both 100V and 50Hz. This is a useful example of why voltage and frequency are separate checks: a device can have a voltage range printed on its label while also specifying a frequency range. TEPCO’s FAQ gives its guidance for foreign products in its service area.

Look for a frequency marking such as “50/60Hz” on the device, power supply or in the manual. If a product lists only one frequency, do not infer compatibility from its plug shape or from a voltage range alone; check the instructions for that product and the area where you will use it. The information here is a regional overview, not a detailed map of the boundary between frequency areas.

How to check if your device works in Japan

Kashimura recommends checking three things for overseas electrical products: input voltage, power consumption and plug shape. The input and consumption information may be printed on the device or explained in its manual, and the consumption figure may be shown in watts (W) or volt-amperes (VA). Work through these checks for each item rather than assuming that every charger or appliance in your bag has the same requirements. See Kashimura’s product-selection guidance.

1. Find the rating information. Look on the charger, power supply, device or manual for a line marked “Input.” Do not confuse an input rating with an output rating: for a power adapter, the input is the information relevant to connecting it to the local supply.
2. Read the input voltage. A range such as “100–240V” is different from a narrower marking such as “110–130V” or “220–240V.” Use the range printed for the specific product, not a general assumption about the device category.
3. Check the frequency. Japan uses 50Hz in the east and 60Hz in the west. If the label or manual specifies a frequency range, compare it with the region where you plan to use the device.
4. Find the power consumption. Note the W or VA figure on the product or in its instructions. You will need this information if the device requires a voltage converter, because the converter must be appropriate for the device’s power use.
5. Check the plug shape and the manufacturer’s instructions. Decide whether the plug needs an adapter, and look for product-specific limits or restrictions. A matching shape and voltage marking do not by themselves confirm that a manufacturer guarantees use in Japan.

For a charger marked 100–240V, the voltage range includes Japan’s 100V supply; if the plug shape differs, the usual requirement is a plug adapter rather than a voltage converter. Apple’s MagSafe 2 adapters are a concrete example: the 45W, 60W and 85W models all list AC 100–240V, 50/60Hz input. Their outputs differ—14.85V at 3.05A for the 45W model, 16.5V at 3.65A for the 60W model, and 20V at 4.25A for the 85W model—so use the specifications for your own adapter. Apple’s MagSafe 2 user guide gives the model details.

Plug adapter or voltage converter?

A plug adapter makes a plug fit a socket; it does not change the voltage. A voltage converter, also called a transformer, changes voltage, and the direction of conversion must suit the device. Kashimura’s guidance distinguishes products marked 100–240V from those marked 110–130V or 220–240V: the latter ranges call for a transformer matched to the device’s power use, as well as a plug adapter if the plug shape differs. Kashimura’s guide sets out these selection principles.

The conversion direction is not something to guess from the word “transformer.” JNTO says a step-down transformer may be needed in some cases, while Yazawa sells a Japan-use product that takes 100V input and provides 220–240V output for 220–240V products. Those descriptions address different requirements, so check the device’s input rating and the converter’s input and output before choosing. See JNTO and Yazawa’s 220–240V product information.

Power capacity is another separate consideration. Kashimura advises allowing a margin of roughly two to three times the device’s rated power consumption when selecting transformer capacity for heating appliances or motor-equipped products. That is especially important for products such as dryers: a converter that provides the right voltage can still be unsuitable if its capacity is too low. Follow the instructions and capacity limits for the specific converter and appliance.

Product examples from Japanese makers

Product specifications can make the difference between a shape adapter and a voltage converter easier to understand. The examples below are not a recommendation for every traveler: compare their socket compatibility, voltage direction and capacity with your own equipment. No prices are provided here, so check the maker or retailer for current pricing and availability.

Yazawa’s HPJPM8 multi plug adapter is intended to fit overseas plugs to Japan’s Type A shape. The manufacturer lists B, C, O, SE, BF, B3, O2 and CB plugs as compatible, but says it does not fit the B3L shape used in parts of South Africa. It is rated AC125V and 13A, with a total capacity of up to 1400W, and it does not convert voltage. Check the exact plug type and the adapter’s limits before purchase. Yazawa’s HPJPM8 information provides the compatibility details.

Yazawa’s HTUC240V100W serves a different purpose: it is a transformer for using 220–240V products in Japan. It takes 100V, 50/60Hz input and supplies 220–240V, 50/60Hz output; its own plug is Type A, while the output accepts B, C and SE plugs. Other plug shapes require a separate adapter, and the connected device must be 100W or less. Yazawa specifically says high-power products such as hair dryers cannot be used with this 100W model. See the HTUC240V100W product details.

Kashimura’s WT-19EJ and WT-20EJ, released on 26 June 2026, convert in both directions between 100V and 220–240V. The WT-20EJ is rated at 3000VA when outputting 230V and 1500VA when outputting 100V, and it weighs about 8.4kg (listed as 8.4 ± 0.25kg). That weight makes it a substantial item to carry, so these larger products should not be confused with small travel plug adapters. Review the maker’s specifications and capacity guidance before deciding whether such equipment suits your trip. Kashimura’s release for the two models gives the release date and ratings.

Hair dryers, straighteners and other high-power items

Hair dryers require particular care because their power use can exceed the limit of a small travel converter. Yazawa’s HTUC240V100W is limited to 100W, and the maker says it cannot be used with high-power products such as hair dryers. Do not choose a converter based only on its size or plug fit: compare the appliance’s W or VA rating with the converter’s capacity and follow both manufacturers’ instructions.

Panasonic makes both domestic-use hair dryers and models intended for use in Japan and overseas. Its dual-use models have a voltage-selection switch, and Panasonic says the relevant models are set to AC200–240V when purchased. For use in Japan, set the switch to AC100–120V as directed by the manufacturer; check that your own model is one of the dual-use products before relying on this advice. Panasonic also warns not to use these dryers with hotel shaver outlets. Consult Panasonic’s hair dryer guidance.

For straighteners and other heating appliances, apply the same product-by-product checks rather than assuming they can be used because a phone charger can. Read the input voltage, frequency and power use, then confirm the manufacturer’s directions and any switch settings. If a transformer is required, choose one with an appropriate conversion direction and capacity; the two-to-three-times capacity margin described by Kashimura applies as guidance for heating and motor-equipped products.

Where to buy adapters and charge on the go

JNTO says plug adapters and transformers are sold in electronics areas such as Akihabara in Tokyo and Nipponbashi in Osaka, as well as in large electronics retailers. These are useful places to look if you need to buy equipment in Japan, but the sources do not establish a standard price or guarantee that a particular model will be in stock. Take a photograph or note of your device’s input rating and plug shape so you can compare the product specifications while shopping. See JNTO’s guide to plugs, electricity and purchase locations.

Train outlets depend on the Shinkansen train type and seat. JR Central says every seat on N700S “Nozomi” trains has a mobile-device outlet; on N700A “Nozomi” trains, outlets are available at every Green Car seat and at window seats and the first and last rows of ordinary cars. “Green Car” is the first-class car. JR Central also warns that the train type can change without notice, so do not plan on having an outlet at a particular seat on every journey. Check JR Central’s train accommodation information and consider carrying a charged power bank as a backup.

JNTO notes that some burger chains and family restaurants have outlets, but that does not mean every branch or seat will have one. The number and type of outlets in individual hotel rooms have not been confirmed and can vary by property. If you need a particular socket arrangement where you are staying, ask the accommodation directly rather than assuming a room will match your needs.

Common first-time mistakes

Mistake: assuming a plug adapter changes the voltage. It does not; it only changes plug shape. Check the input rating first and determine whether the device needs a converter, in addition to an adapter for fit. Kashimura explains the distinction.

Mistake: plugging a 220–240V appliance directly into a Japanese socket. Japan’s supply is 100V, so a product with only a 220–240V input rating needs a suitable converter if it is to be used in Japan. Confirm the direction and capacity of that converter, and check the product instructions before connecting the appliance.

Mistake: using a small converter for a dryer or heater. Yazawa’s 100W transformer cannot power high-consumption products such as hair dryers. Check the W or VA rating and, for heating or motor-equipped products, take account of Kashimura’s guidance to select transformer capacity with roughly two to three times the device’s rated power consumption.

Mistake: buying an adapter without checking its socket compatibility. Adapters do not all accept the same overseas plug shapes. For example, Yazawa’s HPJPM8 supports the listed B, C, O, SE, BF, B3, O2 and CB types but not B3L, so compare your plug with the product’s compatibility list before buying.

Mistake: expecting every train seat to have an outlet. Availability differs between N700S and N700A “Nozomi” trains and between Green Car and ordinary-car seats on the N700A. JR Central warns that the train type can change without notice, which is why a backup charging plan is useful. JR Central lists the seat arrangements.

Frequently asked questions

What plug type does Japan use?

Japan uses Type A plugs, which have two parallel, flat pins. If your plug has a different shape, you may need a plug adapter to fit a Japanese socket. The adapter changes the shape only, so also check your device’s voltage and frequency requirements. JNTO’s FAQ and visitor guide describe the plug type.

What are Japan’s voltage and frequency?

Japan’s standard voltage is 100V AC. The frequency is 50Hz in eastern Japan and 60Hz in western Japan, with Nagoya, Kyoto and Osaka listed by JNTO as examples of 60Hz cities. Check the device label and the region where you will use it rather than relying on a single frequency for the whole country. JNTO’s electricity guide gives the regional overview.

Can I charge my phone or laptop in Japan?

Check the input marking on the charger or power adapter. If it says 100–240V and its frequency range includes the local supply, it will usually need only a plug adapter if its plug does not fit; Apple’s MagSafe 2 adapters are examples of products marked 100–240V, 50/60Hz. Also follow the manufacturer’s instructions, since a voltage marking alone does not guarantee that a product maker approves use in every country.

Do US plugs work in Japan?

Check whether the plug has the two parallel flat pins used by Type A sockets, and check that the device supports Japan’s 100V supply. A device marked only 110–130V is not the same as one marked 100–240V; Kashimura advises using a suitable transformer for the narrower 110–130V range, as well as an adapter if the plug shape requires one. Kashimura’s selection guide explains the distinction.

Do I need a converter for my hair dryer?

That depends on the dryer’s input rating and whether it has a voltage switch for use in Japan. Panasonic says its relevant dual-use models should be set to AC100–120V in Japan, and that those models are set to AC200–240V when purchased. A small 100W converter such as Yazawa’s HTUC240V100W is not suitable for a hair dryer; check the model instructions and power rating before using any converter.

Where can I buy an adapter in Japan?

JNTO lists electronics areas such as Akihabara and Nipponbashi, along with large electronics retailers, as places where adapters and transformers are sold. The sources do not give a standard price or confirm individual shop stock, so check the product details and availability with the retailer. Bring the plug type and device input information with you to help distinguish a shape adapter from a voltage converter.