PlugVoltage

United Kingdom to Japan Power Adapter Guide

United Kingdom runs 230⁠V and Japan runs 100⁠V. You need a Type A/B plug adapter; check each input label before connecting; a converter is not suitable for every appliance.

Caution: United Kingdom runs 230V and Japan runs 100V. A plug adapter changes the shape, not the voltage — a mismatched appliance must not be connected directly. High-power heating appliances should be replaced with a suitable local model; check both manufacturers before considering a converter.

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

SpecUnited KingdomJapan
Voltage230⁠V100⁠V
Frequency50⁠Hz50/60⁠Hz
Plug typesType GType A/B

Your United Kingdom devices in Japan

Hair Dryer No MacBook Pro Charger (USB-C Power Adapter) Adapter Only CPAP Machine Check Label 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(opens in new tab)

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?

For the typical United Kingdom single-voltage model: do not use it on this supply or buy a travel converter as a workaround. Choose a local-voltage model or a travel model explicitly rated for this supply. Japan is 100⁠V. Confirm frequency and any voltage selector before connecting.

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.