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Illustration of a two-flat-pin charger, cable, smartphone and travel adapter on a hotel desk

Arrival and Departure

Japan Power Plugs and Voltage: Check Your Charger

Check Japan’s 100V electricity, Type A outlets and your charger’s INPUT label before charging. Find out when you need a plug adapter, what to do if charging fails and what to ask hotel staff.

ElectricityChargersPlug adapters

Start with this

Check that INPUT includes 100V. An OUTPUT rating such as 5V describes power supplied to your device, not the wall outlet.

Show this in Japanese

Bringing a phone or laptop charger to Japan? Japan uses 100V electricity and commonly has Type A outlets for two flat parallel pins. Start with the charger’s INPUT label. A rating of 100–240V, 50/60Hz covers Japan’s voltage and frequencies, but you must also check the plug and the manufacturer’s instructions. A plug that fits does not by itself prove compatibility.

Three checks before charging

  • Check that INPUT includes 100V. An OUTPUT rating such as 5V describes power supplied to your device, not the wall outlet.
  • Check the plug shape, any grounding requirement and whether parts are damaged or wet.
  • Confirm that you may use the outlet, then look for the charging indicator on your device.

Reopen this table when you reach your hotel or before buying a charger. Saving lets you return through the saved list in the same browser; it does not save the article offline or sync it between devices.

Choose your next step from the charger label

Check electrical compatibility separately from physical fit. These labels are examples; follow the specifications and instructions for your exact model.

INPUT 100–240V / 50/60Hz
This range covers Japan’s 100V supply, including 50Hz in eastern Japan and 60Hz in western Japan. If the plug shape differs, get a suitable adapter for Japan. You do not need a voltage converter for this input range, but model-specific conditions still apply.
INPUT 220–240V only / a range excluding 100V
Do not assume that a plug adapter makes it suitable. Ask the manufacturer before connecting it, or get a Japan-compatible charger suitable for your device.
Unreadable label
Look up the model on the manufacturer’s specification page. Do not guess from the purchase country or USB connector. If uncertain, leave it unplugged and ask a retailer.
A plug that requires grounding
Do not remove a grounding pin or force the plug in. Check the manual and ask your accommodation or manufacturer whether the required grounding can be provided.

Official sources for this section ·

Voltage and frequencyTravel FAQ: plug typePlug adapters and voltageGrounding and product compatibility

What to prepare before departure

  • Bring a photo of the charger’s model number and INPUT label, plus a cable that fits your device. Show the device model when buying a replacement.
  • If needed, bring an adapter that accepts your plug and fits a Japanese Type A outlet. Check its ratings and grounding support for the intended use.
  • Hotel loans and shop stock vary. If you forgot an adapter, ask reception; if none is available, ask an electronics retailer for a compatible product.

Official sources for this section ·

Voltage and frequencyPlug adapters and voltage

How to start charging at your hotel

1Read the ratingFind INPUT on the charger

INPUT describes electricity received from the outlet; OUTPUT describes power delivered to the device. Check support for 100V and the local frequency. Apple states that its USB power adapters accept 100–240V at 50–60Hz; do not apply that statement to every other brand.

2Check the connecting partsA plug adapter does not change voltage

Use a suitable plug adapter when the voltage is supported but the plug shape differs. This is a different product from a voltage converter. If the shape, rating or grounding is unclear, ask staff or the manufacturer before connecting anything.

3Use an approved outletUse dry, undamaged equipment

Connect according to the device instructions at an outlet the facility allows you to use. Keep the charger ventilated rather than covered by bedding. Do not use damaged, scorched or wet parts or outlets; tell the facility about the problem.

4Check the charging statusLook at the icon and battery level

Confirm the charging indicator and check later whether the battery level has increased. A full battery or a charging-limit setting may prevent an increase. Speed depends on the charger, cable and device. Before leaving, collect your charger and adapter and return any borrowed items.

Official sources for this section ·

Plug adapters and voltageUSB power adapter specificationsPower adapter safety

If charging does not work

No charging indicator

If everything is dry and undamaged, check cable compatibility and connections. Ask the hotel whether the outlet has power, then try another permitted outlet or a compatible cable. If the problem continues, use the manufacturer’s instructions for your model.

The plug will not fit or feels loose

Stop; do not push harder. Ask hotel staff or a retailer whether the plug is suitable for Japan and whether grounding is required. Do not bend or file down pins.

Unusual heat, burning smell or damage

Stop using the equipment, keep clear of unsafe parts and notify staff. Do not retrieve a pin stuck in an outlet or take equipment apart yourself. Ask the manufacturer or facility to handle it.

Official sources for this section ·

Power adapter safetyIf your iPhone will not charge

Before you go out

  • You have enough battery charge, with no abnormal heat or connection problem.
  • You have collected your cable, charger and adapter and returned anything borrowed.

Scope and exceptions

  • This guide focuses on travel chargers. Do not apply the same decision to heat-producing appliances such as hair dryers; ask the manufacturer or use equipment provided by your accommodation.
  • Grounding and power requirements depend on the product. This guide is not certification for an individual device or a repair manual.
  • A USB port does not guarantee the same output or fast-charging support. Apple’s troubleshooting applies to the specified Apple devices; use the relevant manufacturer’s guidance for other brands.

Official sources for this section ·

Plug adapters and voltageIf your iPhone will not chargeGrounding and product compatibility

What to check next

Written and translated with AI assistance, with official pages and the conditions and presentation across six languages checked. No hands-on testing, field reporting, expert review or native-speaker proofreading has been conducted.

Useful Japanese phrases

Borrow an adapter

日本のコンセントに合う変換プラグを借りられますか？

Nihon no konsento ni au henkan puragu o kariraremasu ka?

Could I borrow a plug adapter that fits Japanese outlets?

Check compatibility at a shop

この充電器は日本の100Vで使えますか？

Kono jūdenki wa Nihon no hyaku boruto de tsukaemasu ka?

Can this charger be used with Japan’s 100V electricity?

Ask permission

このコンセントを充電に使ってもいいですか？

Kono konsento o jūden ni tsukatte mo ii desu ka?

May I use this outlet to charge my device?

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Review status: Provisional translation

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Editorial responsibility: JAPAN LIFE GUIDE editorial team

We turn official information into practical next steps for travellers. Source-check dates are shown beside references and are separate from article updates.

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