Japan vs South Korea: plug adapter and voltage compared

No. The Korea Tourism Organization describes round pins for South Korea. Japan's outlets take Type A plugs with two flat pins (JNTO), so bring a plug adapter to Type A. Japan runs on 100V and South Korea on 220V.

Updated October 3, 2026

220Vin South Korea

60Hzin South Korea

9,459,711visitors from South Korea in 2025

Plug adapter needed

South Korea and Japan side by side

South Korea: 220V and 60Hz. Japan: 100V, 50Hz in the east and 60Hz in the west.

Voltage, frequency and plug in Japan and South Korea (official pages, checked 2026-10-03)
	Japan	South Korea
Voltage	100V JNTO	220V Electricity Business Act Enforcement Rule (Korea, law.go.kr)
Frequency	50Hz east, 60Hz west JNTO	60Hz Electricity Business Act Enforcement Rule (Korea, law.go.kr)
Plug	Type A, two flat pinsPanasonic lists Type A and B JNTO	Round pins (Type C and F) Korea Tourism Organization

Who says what about electricity in South Korea

Official sources for voltage, frequency and plug in South Korea, and what each one states
Source	What it states	Kind
Electricity Business Act Enforcement Rule (Korea, law.go.kr)Annex 3, amended 13 June 2025	Voltage: 220V; frequency: 60Hz Source	Government
Korea Electric Power Corporation (KEPCO)Basic supply terms, Article 23	Voltage: 220V; frequency: 60Hz Source	Power company
Korea Electric Power Corporation (KEPCO)KEPCO in-house magazine, 2023	Voltage: 220V Source	Power company
Korea Tourism OrganizationVISITKOREA: electricity and communications	Voltage: 220V; frequency: 60Hz; plug: two round holes Source	Tourism board
Seoul Tourism OrganizationVisit Seoul: essential information	Voltage: 220V; frequency: 60Hz; plug: Type C, F Source	Tourism board

What to pack in South Korea for Japan

Round pins from South Korea need a Type A adapter in Japan.

Round pins: a plug adapter to Type A. Source: Korea Tourism Organization.
Each device from South Korea: read INPUT. 100-240V covers Japan's 100V; 220V alone needs a voltage converter (JNTO).
South Korea: 60Hz. Tokyo: 50Hz. Osaka: 60Hz. A 50/60Hz label covers all three.

Flow chart for travellers from South Korea: does the plug have two flat pins, and does INPUT include 100V? If not, bring a plug adapter or a voltage converter.

Figure by japan-japan.com from JNTO: Plugs and Electricity.

What official pages in South Korea say

8 statements from the Korea Tourism Organization, the Seoul Tourism Organization, the Electricity Business Act Enforcement Rule (Korea, law.go.kr) and the Korea Electric Power Corporation (KEPCO).

Korea Tourism OrganizationThe standard voltage in Korea is 220 volts at 60 Hertz, and the outlet has two round holes.VISITKOREA: electricity and communications

Seoul Tourism OrganizationThe standard voltage in Korea is 220 V and the standard frequency is 60 Hz.Visit Seoul: essential information

Seoul Tourism OrganizationThe types of sockets or outlets used are the C and F types, which have two round holes and are the same types used in Germany, France, Austria, Greece, Turkey, Spain, Pakistan, and many other countries.Visit Seoul: essential information

Electricity Business Act Enforcement Rule (Korea, law.go.kr)220볼트의 상하로 22볼트 이내Annex 3, amended 13 June 2025

In English: 220 V, within 22 V above or below

Electricity Business Act Enforcement Rule (Korea, law.go.kr)60헤르츠 상하로 0.2헤르츠 이내Annex 3, amended 13 June 2025

In English: 60 Hz, within 0.2 Hz above or below

Korea Electric Power Corporation (KEPCO)교류 단상 220V 또는 교류 삼상 380V중Basic supply terms, Article 23

In English: AC single-phase 220V or AC three-phase 380V

Korea Electric Power Corporation (KEPCO)주파수는 60헤르츠(Hz)를 표준주파수로 합니다.Basic supply terms, Article 23

In English: the standard frequency is 60 hertz (Hz)

Korea Electric Power Corporation (KEPCO)표준전압은 110V±6V, 220V±13V, 380V±38V로, 주파수는 60Hz±0.2Hz로 규정하고 있다.KEPCO in-house magazine, 2023

In English: Standard voltages are 110V±6V, 220V±13V, 380V±38V and the frequency 60Hz±0.2Hz

Visitors from South Korea in 2025

South Korea ranked 1st among countries and regions, with 9,459,711 visitors to Japan in 2025 (JNTO, final figures).

Visitors in 2025: 9,459,711
Rank: 1st
Share of all visitors: 22.2%
Change from 2024: +7.3%

Frequently asked questions

Is Japan's plug the same as South Korea's?

No. The Korea Tourism Organization describes round pins for South Korea. Japan's outlets take Type A plugs with two flat pins (JNTO), so bring a plug adapter to Type A.

Is Japan's voltage the same as South Korea's?

No. Japan uses 100V (JNTO); South Korea uses 220V, according to the Electricity Business Act Enforcement Rule (Korea, law.go.kr).

Do I need a voltage converter in Japan from South Korea?

Only for devices rated for 220V alone that are not dual-voltage (JNTO). A charger from South Korea marked 100-240V needs none.