International plug adapter guide — everything you need to know

A plug adapter is a purely mechanical device. It has the shape of one country's plug on one side and the socket shape of another on the other. You insert your plug into it — it then fits into the foreign socket. That's the entire function.

What it does not do: change the electrical voltage or frequency. The power that comes out of the wall passes through the adapter unchanged. A European 230V socket with an adapter fitted is still a 230V socket.

This is the most important thing to understand before plugging anything in abroad. The adapter solves the shape problem. It does not solve the voltage problem. For most modern electronics, there is no voltage problem — but for some appliances, there is.

→ Full explainer: Plug adapter vs voltage converter — what's the difference?

The IEC defines 15 plug types used worldwide. You don't need to memorise all of them — but knowing the major ones covers 98% of trips.

For practical travel, four types cover the vast majority of destinations: A/B (Americas, Japan), C/E/F (continental Europe), G (UK and former British territories), and I (Australia, New Zealand). A universal adapter covering all four handles over 95% of trips.

The world's electrical systems run at two main voltage levels:

• 110–127V / 60Hz — North America, parts of Central America, Japan (100V)
• 220–240V / 50Hz — Europe, UK, Australia, most of Asia, Africa, South America

To find out if your device handles both, check its label or the text moulded into the charger body:

The good news: phone chargers, laptop power bricks, camera chargers, and USB-C GaN adapters are virtually always rated 100–240V. The main exceptions are hair dryers, curling irons, and some electric shavers with heating elements or motors.

→ What does 100–240V on your charger actually mean?
→ Plug adapter vs voltage converter — full guide

Not every international trip requires an adapter. If the destination country uses the same socket type as your home country, your plugs fit directly.

Trips that typically don't need an adapter: US/Canada ↔ Mexico or Japan (Type A), UK → Ireland/Singapore/Hong Kong (Type G), Australia ↔ New Zealand (Type I), most of Europe ↔ most of Europe (Type C/E/F compatible).

Trips that always need an adapter: US/Canada → UK, Europe, Australia, India; UK → Europe, US, Australia; Australia → UK, Europe, US.

Use the plug checker for your specific home country and destination — it handles all 200+ countries instantly.

→ Full guide: Do I need a plug adapter?

There are two main approaches:

Country-specific adapters cover one plug-type conversion only — small, cheap ($3–8), and reliable. Best for travellers who always visit the same region. The downside: you need a different one for each region.

Universal adapters pack multiple socket types into one unit, typically covering Types A, C/E/F, G, and I. They cost more ($15–40) but replace four or five individual adapters. Most include USB-A and USB-C charging ports. Two caveats: many don't cover Type D (India) or Type M (South Africa), and they can be bulkier than dedicated adapters.

The cleanest travel kit for most people: one universal adapter + one GaN multi-port USB-C charger. The GaN charger is dual-voltage, charges everything via USB-C, and the universal adapter gives it a socket in any country.

→ Best travel adapter 2026 — tested for every trip type

Hair dryers and heated styling tools — The highest-risk item most travellers pack. Most hotel-grade hair dryers are single-voltage (120V or 220V only). Connecting a 120V hair dryer to a 220–240V socket with only a plug adapter will destroy it immediately. Always check the label. Travel hair dryers are built dual-voltage — worth buying if you travel frequently.

→ Why your hair dryer is the most dangerous thing you pack abroad

USB-C laptops — USB-C is a cable standard, not a power standard. Your USB-C laptop still needs its charger's wall plug to fit the local socket. The good news: virtually all USB-C laptop chargers are rated 100–240V, so you only need the shape adapter.

→ Your USB-C laptop abroad — do you still need an adapter?

Power banks on flights — Lithium battery regulations have tightened. Power banks above 100Wh require airline approval; above 160Wh are banned from passenger aircraft entirely. Check your bank's Wh rating before packing it in carry-on.

→ New power bank rules for flights

Japan's 100V — Japan runs at 100V, the lowest in the world. Most modern dual-voltage devices handle it fine (their range starts at 100V), but older or budget electronics may not reach full performance. Always verify the device label starts at 100V, not 110V.

Each guide below covers the exact plug type, voltage, whether you need a converter, and adapter recommendations for that specific route.

From the United States & Canada

• US to UK plug adapter guide — Type A/B → Type G, 230V
• US to Europe plug adapter guide — Type A/B → Type C/E/F, 230V
• US to Australia plug adapter guide — Type A/B → Type I, 230V
• US to Japan plug adapter guide — Type A compatible, 100V
• US to India plug adapter guide — Type A/B → Type D/C, 230V
• US to China plug adapter guide — Type A/B → Type I/A, 220V
• US to Thailand plug adapter guide — Type A/B → Type A/B/C, 220V
• US to Mexico plug adapter guide — Type A compatible, 127V
• Canada to UK plug adapter guide — Type A/B → Type G, 230V

From the United Kingdom

• UK to Europe plug adapter guide — Type G → Type C/E/F, 230V
• UK to US plug adapter guide — Type G → Type A/B, 120V
• UK to China plug adapter guide — Type G → Type I/A, 220V

From Europe

• Europe to UK plug adapter guide — Type C/E/F → Type G, 230V
• Europe to China plug adapter guide — Type C/E/F → Type I/A, 220V

From Australia & Asia

• Australia to UK plug adapter guide — Type I → Type G, 230V
• Australia to China plug adapter guide — Type I → Type I/A, 220V
• China to UK plug adapter guide — Type I/A → Type G, 230V
• China to US plug adapter guide — Type I/A → Type A/B, 120V

Run through this before every international trip:

1. Confirm the destination's plug type — use the plug checker or the route guides above
2. For multi-country trips, check each country separately
3. Check every charger and appliance label for its input voltage range
4. Flag hair dryers, curling irons, and electric shavers — these are the most likely single-voltage devices
5. Check medical equipment (CPAP, nebulisers) — most modern CPAPs are dual-voltage, but verify the label and contact the manufacturer if unsure
6. Check your power bank's Wh rating if flying — anything over 100Wh needs airline approval
7. Pack your adapter in your carry-on, not checked luggage — you'll need it immediately on arrival

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