Can I Use My CPAP Machine in Japan?
You're good — plug right in.
Your device's voltage range matches this country, and the plug fits. You can use it directly — no adapter or converter needed. As a final check, confirm the voltage range printed on the device label.
The short answer
Most modern CPAP machines are dual-voltage (100–240V) and need only a plug adapter — but as a medical device, never assume: confirm the exact label and check whether your heated humidifier is frequency-sensitive. Bring the manufacturer's travel power supply, consider a battery pack for flights, and avoid cheap voltage converters that output a non-pure sine wave.
Japan runs 100V at 50Hz. Japan uses 100V — the lowest standard mains voltage of any developed country. Plugs look identical to US Type A/B, but the lower voltage means even a US 120V device runs slightly weaker. The frequency is split: 50Hz in the east (Tokyo), 60Hz in the west (Osaka). This matters only for motor- and clock-based devices, not for 50/60Hz-labeled chargers.
CPAP Machine in Japan at a glance
| Device voltage profile | dual |
|---|---|
| Typical wattage | 30–90W |
| Destination voltage | 100V (100–100V) |
| Destination frequency | 50Hz / 60Hz |
| Destination plug types | Type A, B |
| Voltage mismatch | 120V → 100V = -20V |
| Verdict | Good to go |
Other devices & destinations
FAQ
Will a travel adapter let me use my CPAP machine in Japan?
Japan sockets use Type A/B. Your plug already fits, so no adapter is needed.
Do I need a voltage converter for a CPAP machine in Japan?
No. If your CPAP machine is dual-voltage (100–240V), you don't need a converter in Japan.
What plug type does Japan use?
Japan uses Type A, B sockets at 100V / 50Hz.
Adapter vs converter explained
Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.