Korea Plug Type & Voltage: Do You Need an Adapter?

The first thing most of us do after dropping our bags in a Seoul hotel room is reach for the phone charger. Then you look at the wall and find two small round holes staring back. It’s one of the questions my visiting friends ask most: “Can I just plug my charger in? What about my hair dryer?”

This guide answers exactly that. What Korea’s electrical standard actually is, whether your devices need just an adapter or a full voltage converter, and where to get an adapter once you’re here. As a bonus, there’s the story of how Korea switched to 220V, a national project that took 32 years.

What plug type and voltage does Korea use?

Korea uses 220V at 60Hz, and its outlets take round two-pin plugs, Type C and Type F. Under Korea’s Electricity Business Act enforcement rules, the standard voltage is 220V (allowed range 198–242V) and the standard frequency is 60Hz (±0.2Hz). The Korea Tourism Organization puts it simply in its English guide: the standard voltage is 220 volts at 60 hertz, “and the outlet has two round holes.”

Type F sockets have metal grounding clips on the sides, while Type C is just two round pins with no ground. Any plug with two round pins (Type C, and European Type E and F) goes into a Korean wall socket. Koreans often call the outlet and plug shape 돼지코 (dwaejiko), literally “pig nose.” Even the living guide for foreign researchers at the Institute for Basic Science (IBS), a government-funded institute, notes that Korean outlets are “colloquially called ‘pig nose’ in Korean.”

Can I plug in my devices from home?

There are two separate questions here. Does the plug fit (the adapter question)? And can the device handle 220V (the converter question)? In the table below, the converter column assumes a single-voltage device, meaning the label does not say 100-240V.

🔌 Electrical standards by country and what you need in Korea (Korea: 220V · 60Hz · Type C/F)

In short:

• US, Canada, Japan, Taiwan: you always need an adapter, and at roughly half Korea's voltage, single-voltage devices won't work without a converter.
• China, Hong Kong, UK, Australia: the voltage is close, so just change the plug shape. Check the frequency rating on 50Hz appliances with motors or timers.
• Germany, France, Indonesia: you usually need nothing at all.
• Vietnam: round-pin plugs fit, flat-pin plugs need an adapter.

What’s the difference between an adapter and a converter?

An adapter only changes the plug shape. A converter (transformer) changes the voltage. People mix these up all the time, so here’s the difference side by side.

The IBS living guide makes the same point: 110V-only devices need a step-down transformer, which is heavy and hard to find. For a traveler, it’s far easier to pack only universal devices and borrow or buy the rest in Korea than to haul a transformer around.

Can I use my hair dryer or straightener in Korea?

Leave 110V- or 100V-only hair dryers, curling irons and straighteners at home. Heat-styling tools draw a lot of power. On the wrong voltage they either burn out on the spot or refuse to turn on. And a transformer rated at three times their wattage is heavy enough to be a real burden on the road.

Here’s what to do instead.

• If the label says 100-240V (dual voltage), just add an adapter. Japan's national tourism organization (JNTO) gives visitors to Japan the same rule: dual-voltage hair dryers, irons and shavers work as they are.
• Use the hotel's dryer. Many Seoul hotel rooms come with one. If you're booking a guesthouse, ask before you go.
• Dyson hair tools are designed, per Dyson's own guidance, for the standard voltage of the country where you bought them, so renting a Korea-spec unit makes more sense. See what to rent in Seoul instead of packing for details.
• Cordless styling tools with built-in batteries may be refused on the plane altogether, regardless of voltage. Check power bank rules on flights from Korea.

The same goes for medical devices. The power supply for the ResMed AirSense 11 CPAP machine, for example, is rated 100-240V, 50-60Hz, so a plug adapter is all it needs. If you travel with a medical device, check its power supply label before you fly.

Where can I buy a plug adapter in Korea?

The Korea Tourism Organization’s English guide covers this. If you don’t have a multi-voltage travel adapter, you can borrow or buy one at your hotel’s front desk, and you can also find them at the airport, retail stores, major duty-free shops and even convenience stores.

Because airport and convenience-store adapters are pricey, the surest and cheapest move is to buy a universal adapter before you leave. One that includes Korea (Type C/F) will keep earning its place in your bag on future trips. Pick one with USB ports and a single outlet can charge your phone and power bank at the same time, which is a lifesaver in a hotel room with one free socket.

Why does Korea use 220V?

Korea was once a 110V country too. To push more power through the same wires and cut losses, the government and the state utility KEPCO ran a 승압 사업 (voltage upgrade project) to move everyone to 220V. According to a 1990 Seoul Shinmun report, the switch was decided under government leadership in 1963, and full-scale work began in 1973.

Korea’s legal voltage table still lists 110V, and places like Incheon Airport keep separate 110V charging points. But for packing purposes, assume every wall socket in your hotel or rental is 220V.

Packing checklist

• Check every charger label for INPUT 100-240V
• Flying in from the US, Canada, Japan, Taiwan, China, Hong Kong, the UK or Australia? Pack one or two Type C/F adapters (ideally with USB ports)
• Leave 110V/100V-only hair dryers and curling irons at home → use the hotel's or rent one
• From a 50Hz country (Europe, China, Hong Kong, Australia and others)? Make sure appliances with motors or timers list 50/60Hz on the label
• Check medical device power supplies before you fly
• For anything with a built-in battery, also read the in-flight power bank rules

For mobile data, see our Korea SIM and eSIM guide, and for getting around, why Google Maps barely works in Korea.