You Will Need an Adapter and You Will Need It at Midnight
Thailand runs on 220V, uses three different plug shapes, and the outlet you need in Thailand is frequently the one your hotel room does not have.
There are three sockets in the room and none of them are yours. The fan is on a two-pin round one, the kettle is on a three-pin, and the socket by the bed that would be the only convenient one for a laptop is occupied by a lamp you cannot unplug. This is a normal Thai hotel room and the fix is a five-baht adapter bought from a shop that is now closed.
Last verified 5 September 2026.
What Thailand actually runs
220 volts, 50 hertz. That is European voltage, so if your device is 220 to 240V you are fine everywhere in the world and need no converter at all.
Most modern chargers and laptops handle 100 to 240V automatically, and the vast majority of things people carry now do. A hairdryer is the classic exception: hairdryers are almost always single-voltage and the small printed voltage on the underside is not a suggestion.
So the question is not "will this voltage work", it is "does this device need a converter", and for anything with a power supply brick the answer is almost always no.
Which plug shapes work
Type A, two flat parallel pins, is the US and Japanese shape and it works. This is the most convenient thing about Thailand for anyone who has US or Japanese equipment.
Type C, the round two-pin Euro plug, works. This is the standard across most of continental Europe and it fits Thai sockets too.
Type O, the round three-pin Indian plug, also appears. It fits in some Thai sockets.
Type G, the UK three-pin rectangular plug, does not work and this catches British and Irish travellers more than anyone else, because they assume every country has the same sockets as home.
Type D, the Indian three-pin, does not work.
What to actually buy
A universal travel adapter, and only one. They are sold everywhere including 7-Eleven, they cost 100 to 300 baht, and a multi-plug adapter with USB ports is genuinely more useful than three separate things.
Buy a multi-port USB charger rather than a multi-plug adapter. This is the advice that has become true in the last five years: almost everything you carry charges over USB, and a single mains charger with two or three USB ports replaces a bag of adapters entirely.
Buy it before you need it. The first shop that sells adapters is usually open, but it will not be open at midnight, at an airport at 1am, or anywhere on a Sunday in a small town. This is a "buy in the first hour" item.
Grounding, which is the one people get hurt by
Many Thai sockets, particularly older ones, are two-pin ungrounded. A grounded three-pin plug will usually fit, usually with a bit of force or an earth-pin lifter, and the ground connection may go nowhere.
Do not use a cheap adaptor that does not carry earth through, particularly for anything with a heating element or a motor: a hair dryer, an iron, a kettle, a fan, a vacuum. These are exactly the appliances where a missing earth matters, and the cost of an adapter that carries it is a small fraction of the cost of a different piece of plastic.
And if a plug gets hot, smells, or needs unusual force, stop using it. A hot or discoloured socket in a tropical climate is a bad sign and it is worth reporting to reception rather than working around.
Power cuts and what to do about them
Brief outages happen, more in the provinces and more in the wet season, and they are usually short. The Thai grid is not as reliable as Singapore's and is considerably more reliable than parts of the Philippines or Nepal.
Carry a charged power bank, not a spare battery, because a power bank is also your answer to the airport queue, the long night bus and the day you are lost.
Never leave a fridge open thinking it will stay cold through a cut, which is a thing everyone tries once.
And in a homestay or a long-term rental, ask what happens during an outage, because in a building with a backup generator the difference between a two-minute flicker and three hours in the dark is entirely down to whether the place has one.
The thing that is not a problem
Voltage is a solved issue for essentially all modern equipment and you do not need a converter. The whole problem reduces to a five-baht piece of plastic, and the real risk is the one where somebody brings a single-voltage hairdryer to a 220V country and does not check the label. Read the label on anything with a motor or a heating element. Everything else you are carrying is fine.
