Using United Kingdom Electronics in Japan

United Kingdom runs 230⁠V and Japan runs 100⁠V. You need a Type A/B plug adapter; single-voltage devices also need a converter.

United Kingdom runs 230V and Japan runs 100V. A plug adapter changes the shape, not the voltage — single-voltage devices need a converter.

United Kingdom (230⁠V) vs Japan (100⁠V) at a glance

Spec	United Kingdom	Japan
Voltage	230⁠V	100⁠V
Frequency	50⁠Hz	50/60⁠Hz
Plug types	Type G	Type A/B

Your United Kingdom devices in Japan

Hair Dryer No MacBook Pro Charger (USB-C Power Adapter) Adapter Only CPAP Machine Adapter Only iPhone Charger Adapter Only

Next step

What to do next

Check one device in JapanUse your exact device label for Japan, not just the route average.Build a Japan trip packSave several devices, adapter needs, and converter/no-go warnings together.Adapter vs converterAvoid the common mistake: plug shape does not change voltage.

The adapter we recommend

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Get a United Kingdom→Japan adapter

Safety check: a plug adapter only changes plug shape. It does not convert voltage, so confirm your device label before buying.

Shopping links never change the safety verdict.

Best travel adapters for Japan →

FAQ

Do United Kingdom plugs work in Japan?

No — United Kingdom Type G plugs don't fit Japan Type A/B sockets. You need a plug adapter.

Will my United Kingdom hair dryer work in Japan?

Not safely if it's single-voltage. Japan runs 100V vs United Kingdom's 230V — use a dual-voltage dryer or a converter.

Is the voltage different between United Kingdom and Japan?

United Kingdom is 230V and Japan is 100V. That difference matters for single-voltage devices.

Power outlets in Japan · Adapter vs converter

Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.