Can I Use My CPAP Machine in Japan?

Q: What plug type does Japan use?

Japan uses Type A/B sockets at 100V / 50/60Hz.

Check your CPAP machine's label before using it in Japan.

Check your device label first

Device label unknown: confirm actual INPUT
Destination grid 100⁠V / 50/60⁠Hz
Plug fit Type A/B fits
Verdict Check your device label first

Device voltage: unknown: confirm actual INPUT
Destination grid: 100⁠V / 50/60⁠Hz
Plug type: Type A/B fits
Typical wattage: 30–90⁠W
Verdict: Check your device label first
Reviewed: 2026-07-16

Based on what's typical for this device — confirm on the label to be sure.

Next step

What to do next

Read label examplesConfirm what 100-240V, 120V, and 230V labels mean.Re-run with label valuesUse the checker again after confirming 100-240V, 120V, or 230V.Add it to a trip checklistKeep CPAP Machine in a saved packing verdict for Japan.

Why

Compatibility is unconfirmed. Read the exact INPUT voltage range and frequency on your device or power supply, and compare them with the destination. The whole local range must be covered; 110–220V does not include 100V or 230–240V. Confirm the actual plug, grounding and manufacturer restrictions. Do not plug in while these details are unknown. 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 / 50/60⁠Hz. 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

Your CPAP machine vs Japan's grid
Device voltage profile	unknown: confirm actual INPUT
Typical wattage	30–90⁠W
Destination voltage	100⁠V
Destination frequency	50/60⁠Hz
Destination plug types	Type A/B
Voltage mismatch	120⁠V → 100⁠V = -20⁠V
Verdict	Check your device label first

Plug types in Japan: Type A, Type B

How different input labels change this answer

Calculated examples for reading labels, not a test of your unit. Compare your actual label before using an example result.

Japan: 100⁠V · 50/60⁠Hz

100–240V 50/60Hz → Conditional compatibility
AC 100-240V ~1.0A 50-60Hz → Conditional compatibility

Sources and limits

What the evidence covers

A source supports only the facts, socket types or models listed below. A model example does not verify every device in its category. Confirm your own label and outlet.

Coverage: Kansai Electric Power: Voltage and frequency are different in Japan; VDE: Power supply and security when traveling
Reviewed: 2026-07-16

Evidence by fact

Nominal voltage: Kansai Electric Power: Voltage and frequency are different in Japan Scope: Japan checked: 2026-07-16 ; VDE: Power supply and security when traveling Scope: Japan (Types verified: A, B) checked: 2026-07-17
Frequency: Kansai Electric Power: Voltage and frequency are different in Japan Scope: Japan checked: 2026-07-16 ; VDE: Power supply and security when traveling Scope: Japan (Types verified: A, B) checked: 2026-07-17
Socket types: VDE: Power supply and security when traveling Scope: Japan (Types verified: A, B) checked: 2026-07-17

Scope

Kansai Electric Power: Voltage and frequency are different in Japan: States 100V and the 50Hz east / 60Hz west split; appliance examples remain general guidance.
VDE: Power supply and security when traveling: All listed base claims match this non-binding VDE consumer reference.

Sources and limits

What the evidence covers

A source supports only the facts, socket types or models listed below. A model example does not verify every device in its category. Confirm your own label and outlet.

Coverage: CPAP Machine
Reviewed: 2026-08-21

Evidence by fact

Voltage profile: ResMed: AirSense 11 user guide (Profile evidence pending; example only) Scope: ResMed AirSense 11 with 65 W power supply checked: 2026-08-21 ; Philips: DreamStation BiPAP autoSV user manual (Profile evidence pending; example only) Scope: Philips DreamStation BiPAP autoSV with 80 W power supply checked: 2026-08-21
Profile evidence pending; example only
Wattage range: ResMed: AirSense 11 user guide (Profile evidence pending; example only) Scope: ResMed AirSense 11 with 65 W power supply checked: 2026-08-21 ; Philips: DreamStation BiPAP autoSV user manual (Profile evidence pending; example only) Scope: Philips DreamStation BiPAP autoSV with 80 W power supply checked: 2026-08-21
Profile evidence pending; example only
Frequency behavior: ResMed: AirSense 11 user guide (Profile evidence pending; example only) Scope: ResMed AirSense 11 with 65 W power supply checked: 2026-08-21 ; Philips: DreamStation BiPAP autoSV user manual (Profile evidence pending; example only) Scope: Philips DreamStation BiPAP autoSV with 80 W power supply checked: 2026-08-21
Profile evidence pending; example only
Grounding: ResMed: AirSense 11 user guide (Profile evidence pending; example only) Scope: ResMed AirSense 11 with 65 W power supply checked: 2026-08-21 ; Philips: DreamStation BiPAP autoSV user manual (Profile evidence pending; example only) Scope: Philips DreamStation BiPAP autoSV with 80 W power supply checked: 2026-08-21
Profile evidence pending; example only
Safety guidance: ResMed: AirSense 11 user guide (Profile evidence pending; example only) Scope: ResMed AirSense 11 with 65 W power supply checked: 2026-08-21 ; Philips: DreamStation BiPAP autoSV user manual (Profile evidence pending; example only) Scope: Philips DreamStation BiPAP autoSV with 80 W power supply checked: 2026-08-21
Profile evidence pending; example only

Scope

ResMed: AirSense 11 user guide: The guide specifies 100-240 V, 50-60 Hz, typical/peak consumption, and Class II equipment. These values apply to AirSense 11, not every CPAP.
Philips: DreamStation BiPAP autoSV user manual: The manual specifies 100-240 VAC, 50/60 Hz and Class II equipment for this model. Exact medical-device instructions remain model-specific.

Find the INPUT label first. If the label is missing or unclear, do not plug it in and do not buy a converter on guesswork.

For medical devices, always confirm voltage on the label and check with the manufacturer when in doubt.

Other devices & destinations

Power outlets in Japan Using a CPAP machine abroad CPAP Machine in South Korea CPAP Machine in China

FAQ

Can I use my CPAP machine in Japan?

Check your CPAP machine's label before using it in Japan. Japan runs 100⁠V / 50/60⁠Hz on Type A/B sockets.

Will a travel adapter let me use my CPAP machine in Japan?

Not by itself. First check the label — if your CPAP machine is single-voltage, a plug adapter will not protect it from 100V.

Do I need a voltage converter for a CPAP machine in Japan?

First check the label. If it says only 120V or only 230V and that does not match Japan's 100V, do not buy or use a converter until wattage and local voltage are confirmed.

What plug type does Japan use?

Japan uses Type A/B sockets at 100⁠V / 50/60⁠Hz.

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.