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01Plug adapter finder
The letters are the International Electrotechnical Commission's names for each plug and socket shape. When a country lists several letters, you'll usually find more than one socket style in the wild, especially in older buildings. An adapter for the first letter listed is the safest bet, and a multi-region adapter covers the odd ones.
Some international hotels add US or universal sockets at the desk. Don't count on it. A small adapter weighs almost nothing and saves you hunting for a shop on arrival.
02The plug types you'll actually meet
There are about 15 plug types in use worldwide, but a handful cover nearly every trip a US traveler takes. Here's what each looks like and where you'll see it.
| Type | What it looks like | Common in | US plug fits? |
|---|---|---|---|
| A / B | Two flat parallel pins (B adds a round ground pin) | US, Canada, Mexico, Japan, much of the Caribbean | Yes |
| C | Two round pins, slim and ungrounded | Most of continental Europe, plus parts of South America, Asia and Africa | No |
| E / F | Two round pins with ground clips or a ground pin | France and Belgium (E); Germany, Spain, the Netherlands and others (F) | No, but a Type C adapter fits |
| G | Three chunky rectangular pins | UK, Ireland, Hong Kong, Singapore, Malaysia | No |
| I | Two angled flat pins, often with a ground pin | Australia, New Zealand, Fiji, and China alongside A and C | No |
| J / L | Round pins in a row or triangle | Switzerland (J), Italy (L); both also take Type C | No, but a Type C adapter fits |
| D / M | Three large round pins | India, South Africa and neighbors | No |
03Adapters change the shape. Converters change the voltage.
This is the part that trips people up. A plug adapter is just a passive shape-shifter: your US prongs go in one side, the local prongs come out the other. Nothing about the electricity changes. A voltage converter or transformer actually steps 220–240V down to the 120V a US appliance expects.
Phone chargers don't need a converter because they convert voltage internally. Look on the brick for INPUT 100–240V. That's true of the chargers that come with or are sold for nearly every modern phone, tablet and laptop. Hair dryers, curling irons and some small kitchen gadgets are the exceptions, and many travel versions of those have a dual-voltage switch.
Frequency matters even less. Most countries run at 50Hz, while the US uses 60Hz. Chargers marked 50/60Hz don't care either way.
A quick way to sort your bag: anything with a USB port on the other end of the cord, like phone, watch and earbud chargers, is almost certainly fine. Anything that heats, like hair tools and travel kettles, needs a closer look at the label before it goes near a foreign socket.
+Universal adapter upsides
- One piece covers most regions
- Many add USB ports, so you can skip a charger brick
- Great for multi-country trips
–Universal adapter downsides
- Bulkier than a single-country adapter
- Built-in USB ports are often slow
- Heavy chargers can sag out of loose sockets
04Small details that cause big headaches
- Grounded plugs need grounded adapters. Most phone chargers have two prongs, so any adapter works. Laptop chargers with a three-prong cord need an adapter with a ground connection.
- Japan uses Type A, but not always polarized. Some older Japanese sockets have two equal slots, so a US plug with one wider prong may not go in. A cheap A-to-A adapter solves it.
- Type C is the Swiss Army knife of Europe. It fits Type E, F, J, K and L sockets, so one slim adapter covers most of the continent. It won't fit the UK.
- Watch the weight. A large charger hanging from an adapter in a worn socket can fall out overnight. A charger with a short cord or a compact GaN brick is easier on old sockets.
- Check your power strip. A US power strip isn't dual-voltage just because your phone charger is. Don't plug one into a 230V socket unless it's marked for it.
Our guide to charging your phone abroad covers hotels, airports and in-flight power. If you're packing one charger for everything, see the travel charger setup, and use the charger wattage calculator to size it.
A GaN charger that comes with travel plug adapters, a compact foldable-plug charger and a multi-port brick.
Questions people ask
What plug adapter do I need for Europe?
A Type C adapter covers most of continental Europe, because its two slim round pins fit Type E and F sockets too. The UK and Ireland are the exception: they use Type G, the three-pin rectangular plug.
Do I need a plug adapter for Canada or Mexico?
No. Canada and Mexico use the same Type A and B sockets as the US, at a similar voltage. Your chargers plug straight in.
What's the difference between a travel adapter and a converter?
An adapter changes the plug shape so it fits the wall. A converter changes the voltage. Phone and laptop chargers rated 100–240V only need an adapter. Single-voltage appliances need a converter.
Is a universal travel adapter worth it?
If you visit more than one region a year, yes. One universal adapter covers most socket types. For a single-country trip, a small dedicated adapter is lighter and sits more securely in the socket.
What plug do they use in Japan?
Japan uses Type A and B sockets, the same shape as the US, at 100V. Phone chargers work fine. Some older sockets don't accept polarized plugs with one wider prong, so a simple adapter can help.