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How to Choose the Right CPAP Mask Size
A poorly sized CPAP mask is the leading cause of leaks and discomfort. Too large and the cushion won't seat properly on the face. Too small and it compresses tissue and leaves painful marks. This guide explains how to measure your face and choose the correct size, brand by brand.
Why Does Mask Size Matter So Much?
Each manufacturer has its own sizing system, and templates vary from one model to another. A Medium from ResMed does not necessarily match a Medium from Fisher & Paykel. It is therefore essential to measure your face using the gauge specific to the model you are considering.
How to Use a Sizing Template
- Print the template at 100% scale (verify the calibration ruler matches 5 cm or 10 cm as indicated).
- Hold the template against your face in front of a mirror.
- Position it according to the indicated reference points (often: starting point on the nasal bridge or just below the nose base).
- Identify which zone of the template best matches the width and height of your nose or chin.
- The corresponding zone indicates your recommended size.
Size Charts by Brand and Mask Type
ResMed - Full-Face Masks (AirFit F20, AirTouch F20)
| Size | Nose-to-chin distance (approx.) | Nose width (approx.) |
|---|---|---|
| XS | ≤ 95 mm | Narrow |
| S | 95-105 mm | Medium-narrow |
| M | 105-115 mm | Medium |
| L | > 115 mm | Wide |
These values are indicative. Always use the official ResMed sizing template.
ResMed - Nasal Masks (AirFit N20, AirTouch N20)
| Size | Nose width (approx.) | Nose height (approx.) |
|---|---|---|
| XS | < 29 mm | Small |
| S | 29-34 mm | Medium-small |
| M | 34-39 mm | Medium |
| L | > 39 mm | Large |
ResMed - Nasal Pillow Masks (AirFit P10, AirFit P30i)
| Size | Nostril diameter (approx.) |
|---|---|
| XS | Very small nostrils |
| S/M | Average-sized nostrils |
| L | Wide nostrils |
Fisher & Paykel - Full-Face Masks (Evora Full Face, Vitera, Simplus)
| Size | Profile |
|---|---|
| XS | Very small / feminine face |
| S | Small face |
| M | Average face (most common size) |
| L | Large face |
Fisher & Paykel offers the SizeRight™ template available on their website. Consult it before purchasing an F&P mask.
Philips - Full-Face and Nasal Masks (DreamWear Full Face, DreamWear Nasal)
| Size | Profile |
|---|---|
| XS | Very small face |
| S | Small face |
| M | Average face |
| L | Large face |
Common Mistakes to Avoid
- Choosing the same size as a previous mask from another brand. Sizing systems are independent. Measure again each time you change brand or model.
- Going up a size for "more comfort". A mask that is too large will not seat properly and will leak more.
- Over-tightening the headgear to compensate for leaks. If you tighten heavily to avoid leaks, the size is likely wrong.
- Not printing the template at 100% scale. Always print without reduction and verify the calibration ruler on the template.
- Measuring with a long beard. A beard can distort measurements: measure preferably with a close shave.
Signs Your Current Size Is Wrong
- Persistent leaks despite a well-adjusted headgear.
- Red or painful marks upon waking (mask too small or too tight).
- Sensation that the mask is "floating" on the face (mask too large).
- Cushion rides up to the eyes during the night (mask too large).
See Also
Frequently asked questions about CPAP mask sizing
Download the manufacturer's official template and print it at 100% scale. Check the calibration ruler printed on the sheet before measuring. Place the template in front of a mirror, following the indicated reference points (nasal bridge or nose base). Identify the zone matching the width and height of your nose or chin. Measure preferably with a close shave to avoid inaccuracies.
Each manufacturer uses its own sizing system, so a Medium from ResMed is not equivalent to a Medium from Fisher & Paykel or Philips. Cushion width, height and depth all vary. For each new model or brand, measure your face again with the official template. Never rely on your old size from another brand to choose a new mask.
In most cases, choose the smaller size. A slightly smaller mask seats better against the face and leaks less. An oversized mask tends to float on the cheeks, especially in lateral position. If you genuinely hesitate, order cushions in both adjacent sizes to test. Replacement cushions cost far less than a complete mask and let you validate your choice risk-free.
CPAP masks are personal medical devices. For hygiene reasons, they are generally not returnable once opened and tried on. At VivaRespire, we help you choose the right size before purchase using official templates and our advice. In case of doubt, contact us: we can guide your choice based on your morphology and breathing type.
No. No international standard imposes common dimensions on manufacturers. Each brand defines its own XS, S, M, L from its own anatomical measurements. Some masks even use a single frame with multiple cushion sizes (Philips DreamWear). Always read the specific guide for the targeted model: it is the only reliable way to choose the right size first time.
Yes, it is actually the most common cause of leaks. An oversized mask does not make uniform contact with the face: it floats on the cheeks, slides toward the eyes at night, and loses its seal at every movement. The temptation to tighten the headgear more then aggravates marks and discomfort without solving the problem. If you tighten heavily to seal, the size is probably wrong.
VivaRespire is an online store: we have no physical showroom to try masks. To compensate, we provide official templates for each model and our advisors answer your questions by email. If you live in Belgium and want to try several masks in person, some accredited sleep centres offer fitting rooms. We remain at your disposal to guide you.