Travel adapters explained: what they do, what they don't, and how to pick one

Every year somebody plugs a travel hairdryer into a hotel socket through an adapter and hears a bang. The adapter was not faulty and the hotel was not at fault. The traveller had bought the right product for a different problem.

An adapter is not a converter

This is the single most useful thing to understand before you buy anything.

A travel adapter changes the physical shape of the plug so that it fits a foreign socket. That is all it does. The electricity coming out the other side is whatever the country supplies.

A voltage converter changes the supply itself, stepping it up or down. It is a different, heavier and more expensive device, and most travellers do not need one.

The reason most travellers do not need one is that the majority of modern electronics are already dual-voltage. Look at the small print on your charger or power brick. If it says something in the region of 100–240V, 50/60Hz, the device handles the whole world's mains on its own and only needs the plug reshaping. Phone chargers, laptop chargers, camera chargers, tablets and most electric shavers are usually in this group.

What is usually not: anything that makes heat or drives a motor at full mains power. Hairdryers, travel irons, kettles, curling tongs and some older appliances are frequently single-voltage. Those are the ones that need a converter, or — much more sensibly — need leaving at home in favour of whatever the hotel provides.

Read the label before you pack, not after

The check takes ten seconds and it settles the question for that device permanently:

• Find the block of tiny text on the plug, the power brick or the underside of the appliance.
• Look for the input voltage range.
• 100–240V means an adapter alone is fine.
• A single figure such as 220–240V or 110–120V means that device only runs on that supply.

Do this for each thing you intend to take. It is common to find that everything in the bag is dual-voltage except one item.

The plug types you will actually meet

There are more than a dozen plug standards in use, but a few cover most journeys:

• Type G — the three rectangular pins used in the UAE, the UK, Ireland, Malaysia, Singapore and Hong Kong.
• Type A and B — the flat parallel pins of the United States, Canada, Mexico and Japan.
• Type C — the two round pins found across most of Europe, and the most widely compatible single shape in that region.
• Type E and F — the earthed European variants used in France, Germany, Spain and much of the continent.
• Type I — the angled pins of Australia, New Zealand and China.

Worth knowing if you live in the UAE: because the UAE uses Type G, anything you buy locally already has the UK-style plug on it. The adapter you need is one that converts from Type G outwards, which is the opposite direction to what a visitor needs.

One adapter instead of four

The case for a universal adapter is simply that a set of country-specific plugs is a set of things to lose. A single unit that covers the common standards handles a multi-stop trip without you having to remember which pouch holds which country.

Two things separate a good one from a cheap one:

• A proper earth connection where the device you are plugging in has an earth pin. An adapter that quietly drops the earth is not the same product.
• Solid mechanical fit. A universal adapter is a box of sliding parts. If it feels loose in the socket, it will arc, and arcing is what eventually makes the burning smell.

USB ports change the maths

Most of what a traveller charges is USB now, and an adapter with USB built in removes the need to pack the power bricks at all. A phone, a watch, earbuds and a tablet can come off one wall socket.

The number to check is the total output, not the number of ports. Several ports sharing one modest power budget will charge everything slowly if you use them all at once, and a USB-C port that supports fast charging is worth more than two that do not. The output figures are on the product specification — if a listing does not state them, treat that as an answer in itself.

One caveat for laptops: many modern laptops charge over USB-C, but they often want considerably more power than a travel adapter's USB port provides. Check the laptop's own requirement before you leave its charger behind.

A short pre-trip checklist

• Check the voltage label on everything you are taking.
• Note the plug type or types for your destinations.
• Count what needs USB and what needs a mains socket.
• Check the adapter's total USB output against the fastest thing you want to charge.
• If anything is single-voltage and heat-producing, plan to do without it.

Get those five right and the adapter stops being something you think about.

Where to look next

Our travel adapters range covers the common standards, and each product page lists the socket types and the USB output so you can check both against this guide before you buy. If you are still unsure which fits your trip, ask us — that is a faster answer than a comparison table.