Do I Need a Voltage Converter for Japan?

By Best Pick Guide Editorial Team · Updated October 23, 2026

For most US travelers, the answer is no. Japan's power is close to US power, and most chargers handle it fine. But "close" isn't "the same," and a few devices need a second look. Here's how to check.

Japan vs US power

• The US uses about 120 volts at 60 hertz.
• Japan uses about 100 volts. Eastern Japan, including Tokyo, runs at 50 hertz. Western Japan, including Osaka and Kyoto, runs at 60 hertz.

So Japan's voltage is a little lower than at home, not much higher, as it is in Europe. That changes the risk. A US device in Europe can be damaged by too much voltage. In Japan, the more common issue is a device getting slightly less than it expects.

Check the label

Find the "Input" line on each charger or device.

• "Input: 100-240V" means it works in Japan with no converter at all. Most phone, tablet, laptop, watch and camera chargers say this.
• "Input: 120V" or "110-120V" means it was made for US power. It may still run on 100V, but it may run slower, weaker or not as designed.

Since Japan's plug shape matches US two-prong plugs, a dual-voltage charger often needs nothing at all. A three-prong plug needs a simple adapter. See what plug type Japan uses.

Hair dryers and hot tools

A US-only hair dryer, flat iron or curling iron on 100V will usually get less power than at home. Expect less heat and slower drying. The safest options are:

1. A dual-voltage travel dryer. Look for "100-240V" or a voltage switch, and set it correctly.
2. The hotel's dryer. Many Japanese hotels provide one.

Be careful with converters here. Most hair dryer voltage converters are built to step 220-240V down to 110V, for Europe and similar countries. Some say they won't work on low-voltage power at all. One Ceptics converter listing notes its 2000W hair dryer outlet won't operate when the input is 100 to 125V. If you want a converter that also works in Japan, check that its listing names a 100V-range input. The BESTEK 2000W converter, for example, lists 100-140V input on its hair dryer outlet.

For more on sizing, see what size voltage converter you need for a hair dryer.

Devices that are usually fine

• Phone and tablet chargers
• Laptop chargers
• Camera battery chargers
• Watch and earbud chargers

Check the label anyway. It takes five seconds.

What about 50 vs 60 hertz?

Most chargers don't care. Their labels often say "50/60Hz." Some older motor or clock devices made for 60 hertz may run a bit differently in eastern Japan. If a label says "60Hz" only, think twice before packing it.

The plug adapter still matters

Even when you don't need a converter, you may need an adapter, because:

• Many Japanese outlets are two-prong, and your laptop charger may have three prongs
• Hotel rooms may have few free outlets

A small multi-outlet Type A adapter, like the HANYCONY 8-in-1, adds four three-prong US outlets and USB-C ports. Like every adapter, it doesn't change voltage, so the label check above still applies.

The short version

For five Japan adapters compared, see our travel adapter for Japan comparison.