Japan voltage vs Thailand: plugs and adapters compared

Japan runs on 100V and Thailand on 220V. It depends on the plug. The Tourism Authority of Thailand names two flat parallel pins and round pins for Thailand. The flat two-pin plug fits Japan's Type A outlets; round pins need a plug adapter.

Updated October 3, 2026

220Vin Thailand

50Hzin Thailand

1,233,103visitors from Thailand in 2025

Depends on the plug

Thailand and Japan side by side

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

Voltage, frequency and plug in Japan and Thailand (official pages, checked 2026-10-03)
	Japan	Thailand
Voltage	100V JNTO	220V Provincial Electricity Authority (PEA)
Frequency	50Hz east, 60Hz west JNTO	50Hz Electricity Generating Authority of Thailand (EGAT)
Plug	Type A, two flat pinsPanasonic lists Type A and B JNTO	Two flat parallel pins or round pins Tourism Authority of Thailand

Who says what about electricity in Thailand

Official sources for voltage, frequency and plug in Thailand, and what each one states
Source	What it states	Kind
Provincial Electricity Authority (PEA)Electricity tariffs, May 2023	Voltage: 220V Source	Power company
Electricity Generating Authority of Thailand (EGAT)Grid code (operation)	Frequency: 50Hz Source	Power company
Tourism Authority of ThailandPlan your trip: electricity (2019)	Voltage: 220V; frequency: 50Hz; plug: flat parallel prongs and two round pins Source	Tourism board

What to pack in Thailand for Japan

Flat two-pin plugs fit; round pins need a Type A adapter.

Flat two-pin plugs: nothing extra for Japan's Type A outlets. Source: Tourism Authority of Thailand.
Round pins: a plug adapter to Type A. Source: Tourism Authority of Thailand.
Each device from Thailand: read INPUT. 100-240V covers Japan's 100V; 220V alone needs a voltage converter (JNTO).
Thailand: 50Hz. Tokyo: 50Hz. Osaka: 60Hz. A 50/60Hz label covers all three.

Flow chart for travellers from Thailand: 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 Thailand say

4 statements from the Tourism Authority of Thailand, the Provincial Electricity Authority (PEA) and the Electricity Generating Authority of Thailand (EGAT).

Tourism Authority of ThailandIn Thailand, the voltage of domestic AC is 220 volt (50 cycles).Plan your trip: electricity (2019)

Tourism Authority of ThailandElectrical sockets in Thailand are compatible with both flat parallel prongs (like in the United States and Japan) and two round pins (like in most European and Asian countries). While two-pin sockets are common in Thailand, some establishments like hotels and offices also have three-pin outlets installed.Plan your trip: electricity (2019)

Provincial Electricity Authority (PEA)Customer, who has installed meter up to 5 Amp., 220 V., 1 Phase, 2 Wires, is classified under 1.1.1.Electricity tariffs, May 2023

Electricity Generating Authority of Thailand (EGAT)ในภาวะปกติความถี่ของระบบไฟฟ้าจะถูกควบคุมไว้ไม่เกิน 50 ± 0.5 HzGrid code (operation)

In English: Under normal conditions the system frequency is controlled to within 50 ± 0.5 Hz

Visitors from Thailand in 2025

Thailand ranked 6th among countries and regions, with 1,233,103 visitors to Japan in 2025 (JNTO, final figures).

Visitors in 2025: 1,233,103
Rank: 6th
Share of all visitors: 2.9%
Change from 2024: +7.3%

Frequently asked questions

Do I need a plug adapter in Japan from Thailand?

It depends on the plug. The Tourism Authority of Thailand names two flat parallel pins and round pins for Thailand. The flat two-pin plug fits Japan's Type A outlets; round pins need a plug adapter.

Is Japan's voltage the same as Thailand's?

No. Japan uses 100V (JNTO); Thailand uses 220V, according to the Provincial Electricity Authority (PEA).

Do I need a voltage converter in Japan from Thailand?

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