What plug adapter do I need for Japan?

Japan commonly uses Type A outlets with two flat parallel slots. Match the adapter to your actual plug and the outlet you will use. A grounded plug needs an appropriate grounding arrangement; do not remove its earth pin to fit a two-slot outlet.

Do I need a voltage converter for Japan?

Read the appliance or power supply INPUT label first. A range such as 100–240V, 50/60Hz includes Japan’s 100V supply and both regional frequencies. A plug adapter does not convert voltage or frequency. If 100V is outside the stated range, or the label is unclear, ask the manufacturer about the exact model before use.

Will my US charger work in Japan?

Check the actual charger rather than its country of purchase. Japan uses 100V, so a 120V-only rating is different from a 100–240V rating. Plug shape and grounding also need checking; a similar-looking plug alone is not a compatibility check.

Can I bring my hair dryer or straightener to Japan?

Check that exact appliance’s voltage, frequency, power rating and instructions. A phone charger’s rating says nothing about a hair appliance. Do not assume a travel adapter makes a single-voltage appliance suitable; ask the manufacturer, or confirm a suitable appliance with your accommodation before packing.

Before departure · Electrical preparation

Japan plug adapters and voltage: check each device before packing

Japan uses 100V electricity, with 50Hz in the east and 60Hz in the west. Type A outlets have two flat parallel slots. Start with the INPUT label on each charger or appliance, then check plug fit and grounding. A travel plug adapter changes the connection shape; it does not change the supply voltage or frequency.

Sources checked October 15, 2026. This guide helps prepare questions and packing; it does not certify an individual appliance or recommend a transformer.

Plug shape and voltage are separate checks

The Japan National Tourism Organization FAQ identifies Type A plugs and 100V power. Its electricity guide explains the regional frequencies: eastern Japan uses 50Hz, while western Japan, including Nagoya, Kyoto and Osaka, uses 60Hz.

A two-pin North American plug may look familiar, but that does not establish the appliance’s voltage rating. UK three-pin, European round-pin and Australian angled-pin plugs need a suitable connection for the outlet you will use. Check the physical plug you are packing rather than relying on your passport or home country.

Electrical Safety First distinguishes ungrounded Type A from Type B, which has an additional earth pin. If your equipment requires earth, confirm a compatible grounded outlet and adapter with your accommodation. Do not cut off an earth pin or treat a two-slot adapter as a grounding solution.

Read INPUT, not the USB output number

Look on the power brick, charger or appliance that connects to the wall. INPUT describes the power it accepts. An OUTPUT line such as 5V or 20V describes what a charger supplies to the connected device; it does not tell you which wall supply the charger accepts.

These are example labels, not readings from your equipment. Swipe the table sideways on a small screen.

Example INPUT label	What it establishes	Next check
`100–240V ~ 50/60Hz`	The printed range includes 100V and both frequencies used in Japan.	Check the exact model’s instructions, plug fit, grounding and adapter rating. This label alone does not verify the condition or safety of your equipment.
`110–240V ~ 50/60Hz`	100V is below the printed minimum.	Do not round 100V up to 110V. Ask the manufacturer whether this exact model is suitable for Japan.
`120V ~ 60Hz`	The printed rating differs from Japan’s 100V supply; eastern Japan also differs in frequency.	A familiar plug does not resolve those differences. Get model-specific manufacturer advice before use.
`220–240V ~ 50Hz`	The voltage range does not include Japan’s supply.	A shape adapter alone does not address the voltage mismatch. Confirm an appropriate alternative before packing.
Only OUTPUT visible / label unreadable	The accepted wall supply is still unknown.	Find the correct charger or appliance manual and model number. Do not infer compatibility from another device.

For a concrete manufacturer example, Apple’s USB power-adapter guide specifies 100–240V AC at 50–60Hz for the Apple adapters it describes. That statement does not cover every third-party charger, power strip or hair appliance. Read the label on what you actually own.

Hair dryers, straighteners and other appliances need their own check

Review each appliance separately, even if your phone charger accepts 100–240V. If an appliance has a manual voltage selector, follow its own instructions for the destination supply; do not guess from a “dual voltage” marketing label.

A converter or transformer is a separate piece of equipment, with its own limits. Electrical Safety First advises checking the appliance load against its maximum power rating and notes that frequency differences can affect operation. Its travel-adapter guidance also explains why an adapter without earth is unsuitable for equipment that requires it. This guide does not choose a converter from wattage alone. Check the appliance manufacturer’s instructions before considering one.

If the label or instructions leave the question unresolved, confirm a suitable hair dryer or other alternative with your accommodation before departure. A hotel’s appliance list does not establish what every room contains.

Make one packing row for every device

Identify it: record the exact charger or appliance model and photograph its INPUT label for your own reference.
Check the supply: does the stated voltage include 100V? Does the frequency cover the regions you will visit? If unclear, resolve it with the manufacturer.
Check the connection: match the plug, outlet and any grounding requirement. Confirm the adapter’s permitted load and intended use.
Check the whole setup: a charger that accepts 100V does not establish the suitability of a separate power strip or another appliance connected beside it.
Pack for the first day: keep the needed cable and suitable charger accessible. Confirm accommodation facilities instead of relying on an unverified airport, café or train outlet.

Using the same phone for arrival documents? Complete your Visit Japan Web arrival QR preparation while connected, and check access on the device you will carry.

For digital train tickets, complete the Shinkansen booking and boarding preparation before departure. Keep the right device and ticket access available for the local leg too, whether you are arriving in Sendai or starting a Fukuoka city day.

Frequently Asked Questions

What plug adapter do I need for Japan?: Japan commonly uses Type A outlets with two flat parallel slots. Match the adapter to your actual plug and the outlet you will use. A grounded plug needs an appropriate grounding arrangement; do not remove its earth pin to fit a two-slot outlet.
Do I need a voltage converter for Japan?: Read the appliance or power supply INPUT label first. A range such as 100–240V, 50/60Hz includes Japan’s 100V supply and both regional frequencies. A plug adapter does not convert voltage or frequency. If 100V is outside the stated range, or the label is unclear, ask the manufacturer about the exact model before use.
Will my US charger work in Japan?: Check the actual charger rather than its country of purchase. Japan uses 100V, so a 120V-only rating is different from a 100–240V rating. Plug shape and grounding also need checking; a similar-looking plug alone is not a compatibility check.
Can I bring my hair dryer or straightener to Japan?: Check that exact appliance’s voltage, frequency, power rating and instructions. A phone charger’s rating says nothing about a hair appliance. Do not assume a travel adapter makes a single-voltage appliance suitable; ask the manufacturer, or confirm a suitable appliance with your accommodation before packing.