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Travel Adapter vs Converter: Which One You Actually Need
An adapter changes the plug. A converter changes the voltage. Most modern chargers need the first. A cheap hotel hair dryer needs you to leave it at home.
Updated 27 Aug 2026 · 6 min read · travel adapter vs converter
Read the brick, not the blog
The tiny print on a laptop charger — INPUT 100–240V ~ 50/60Hz — means the charger is dual voltage. It only needs the wall shape to change. That is an adapter: a piece of plastic with the right pins, $12–$25 for a decent one, $30–$45 for a GaN cube with two USB-C PD ports and one USB-A.
If the appliance says 120V only, it will smoke on 230V without a real transformer. Hair tools, some shavers, a US-only kettle. Leave them. Buy or borrow locally, or use the hotel’s.
| Thing | Needs | Skip |
|---|---|---|
| Phone / laptop / camera (100–240V brick) | Adapter only | A 2kg converter |
| USB-C hair straightener marked 100–240V | Adapter only | A cheap coil converter |
| US-only 120V curling iron | Leave it at home | A “2000W” travel converter from a drugstore |
| Electric toothbrush charger | Usually adapter; check the stamp | Running it through a shaver socket blindly |
Japan, UK, EU, US — the plug, not the sermon
Japan: Type A, ungrounded, 100V. A US plug often fits; a grounded US plug sometimes does not. UK: Type G, 230V, fused. EU: Type C/E/F, 230V. Australia: Type I. A small cube with interchangeable slides beats four separate lumps in a Japan pack.
Two USB-C PD ports at 20W+ means you can leave the laptop brick at home on a phone-and-tablet week. A 65W GaN cube covers a 14-inch laptop. A 100W cube is for the 16-inch and a camera at once.
Converters that lie
The plastic “converter” the size of a deck of cards claiming 2000W is a diode trick for hair dryers that still burns hotels down. A real transformer for a 120V appliance on 230V weighs more than the appliance and costs more than buying a dual-voltage tool. There is no third option that is both light and honest.
Pack one adapter cube, one 1m USB-C cable, one 2m cable. That is the kit. A power strip with four US outlets plus an adapter is how you trip a Japanese hotel breaker.
Questions, answered
- Will my US phone charger work in Japan?
- Yes if the brick says 100–240V. Japan is 100V; the charger will just run a little cooler. You still need the right pins if yours is grounded.
- Can I use a UK kettle in the US?
- Not on an adapter. 230V heating element on 120V will sulk; the other direction will trip or melt. Dual-voltage or buy tea at the diner.
- Is a surge protector worth packing?
- A small one with the right plug can protect a laptop in a shaky building. It is not a converter. It will not drop 230V to 120V.
