There is no single global standard for electrical sockets. Over the past century, countries developed their own plug and socket systems independently. Today the IEC (International Electrotechnical Commission) recognises 14 plug and socket types, labelled Type A through Type N. Some countries use several types; others have standardised on one.
Why Plug Types Differ Around the World
Electrical systems were developed independently in different countries in the early 20th century, often before international standards existed. By the time standardisation became desirable, replacing infrastructure across entire nations was prohibitively expensive. The result: 14 different plug types still in use across 195+ countries.
The UK, for instance, uses the large Type G with a built-in fuse in each plug — a safety feature added after WWII. The US uses flat-pin Type A/B, while Europe largely uses the round-pin Europlug (Type C) and variants. Australia and New Zealand use the diagonal Type I, shared with China and Argentina.
The 14 International Plug Types
| Type | Description | Common Regions |
|---|---|---|
| A | Two flat parallel pins | USA, Canada, Mexico, Japan, Central America |
| B | Two flat parallel pins + round earth pin | USA, Canada, Mexico (often alongside Type A) |
| C | Two round pins (Europlug) — fits most European sockets | Europe, South America, Asia, Africa |
| D | Three large round pins in triangular formation | India, Nepal, Sri Lanka |
| E | Two round pins + socket hole for earth | France, Belgium, Poland, Czech Republic |
| F | Two round pins + earth clips on sides (Schuko) | Germany, Austria, Netherlands, Russia, most of Europe |
| G | Three rectangular pins (with fuse) | UK, Ireland, Hong Kong, Singapore, Malaysia, UAE |
| H | Three pins in Y-shape (unique to Israel) | Israel, Palestinian territories |
| I | Two or three flat angled pins | Australia, New Zealand, China, Argentina |
| J | Three round pins (two + earth offset) | Switzerland, Liechtenstein |
| K | Two round pins + U-shaped earth | Denmark, Greenland |
| L | Three round pins in a row | Italy, Chile, Uruguay |
| M | Three large round pins (larger than Type D) | South Africa, Lesotho, Swaziland |
| N | Two round pins + earth (IEC standard) | Brazil, South Africa (alongside M) |
Voltage and Frequency — Why They Matter
Getting the plug shape right is only half the challenge. Electrical systems also operate at different voltages and frequencies around the world:
- 110–120V at 60Hz — North America, Central America, parts of South America, Japan
- 220–240V at 50Hz — Europe, UK, Australia, Asia, Africa, most of South America
Using a device rated for only 110V on a 220V socket without a voltage converter can permanently damage or destroy it — and in some cases cause fires. Always check the power label on your device before plugging in.
How to check your device
Look at the small print on the power adapter brick (the rectangular block in the cable). If it says "Input: 100–240V, 50/60Hz", your device is dual-voltage and you only need a plug shape adapter. If it says "Input: 120V" or "Input: 220V" only, you need a voltage converter for use in a different region.
Most modern electronics — laptops, phone chargers, camera chargers, tablets — are dual-voltage. The most common single-voltage appliances are hairdryers, hair straighteners, and some electric shavers. Travel versions of these appliances are widely available and worth buying if you travel frequently.
Japan voltage warning
Japan uses 100V — lower than both the US (120V) and Europe (220–240V). Most dual-voltage devices still work fine (rated 100–240V), but some 110–120V US appliances may perform slightly under capacity.
Top Travel Destinations at a Glance
| Destination | Plug Type(s) | Voltage | Frequency |
|---|---|---|---|
| United Kingdom | G | 230V | 50Hz |
| USA / Canada | A, B | 120V | 60Hz |
| France | C, E | 230V | 50Hz |
| Germany / Austria | C, F | 230V | 50Hz |
| Spain / Portugal | C, F | 230V | 50Hz |
| Italy | C, F, L | 230V | 50Hz |
| Thailand | A, B, C | 220V | 50Hz |
| Japan | A, B | 100V | 50/60Hz |
| Australia / New Zealand | I | 230V | 50Hz |
| Singapore / Hong Kong | G | 230V | 50Hz |
| India | C, D, M | 230V | 50Hz |
| South Africa | M, N | 230V | 50Hz |
| Brazil | N | 127/220V | 60Hz |
| UAE / Dubai | G | 230V | 50Hz |
| Mexico | A, B | 127V | 60Hz |
Choosing the Right Adapter
Single-country vs. universal adapters
If you visit the same destination regularly, a single-country adapter is compact and reliable. For frequent travellers visiting multiple regions, a universal adapter covers most plug types in one unit — though they tend to be bulkier and some have lower maximum wattage.
Adapters with USB ports
Many travel adapters now include USB-A and USB-C ports built in, allowing you to charge multiple devices from a single socket. Look for models with Power Delivery (PD) for faster laptop charging.
What to avoid
- Cheap, unbranded adapters — these can fail at high wattage or overheat
- Adapters without grounding where your device requires it
- Using a plug adapter where a voltage converter is actually needed
Check any country instantly
Use our Power Adapter Checker to look up the plug type, voltage, and frequency for any of 39 countries, including warnings for unusual setups like Japan's 100V system.
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