What size mask do I need?

Every CPAP user is unique, not only because of the size and shape of facial features, but also for the degree of tolerance to CPAP therapy and comfort levels.

Finding the correct size of mask can be difficult, especially as the masks are sealed for hygiene purposes.

Please choose carefully as they cannot be returned once opened.

There is often a number of different sizes for each mask type, and so it can be difficult to know which one is best for you.

Click on any of the images below to download the size guide you are interested in.


· For the best results, we recommend a personal fitting.

· We understand that this is not always possible, so we have provided this information to assist.

· For online purchases and phone orders, we cannot accept responsibility if the mask does not fit.

· For hygiene reasons, once the sealed mask packet has been opened we cannot exchange it.

· By purchasing online using this information, you accept the limitations described above.


BMC Full Face Mask Sizing

The BMC Full Face Masks come in small, medium and large sizes.

To help determine the size you need, simply measure the distance from the top of the bridge of your nose to halfway between your bottom lip and chin as shown in the picture below.

Small Size = 8~9cm

Medium Size = 9~10cm

Large Size = 10~11.5cm

Micro Nasal Mask Sizing

The BMC Micro Nasal Masks come in small, medium and large sizes.

Small Size = <37mm

Medium Size = 37-41mm

Large Size = 41-50mm

BMC Nasal Pillow Mask Sizing

Nasal Pillow Mask Sizing

The BMC Nasal Pillow Mask is very versatile, because the mask we provide includes three different sized pillows all in the one packaging. The nasal pillow mask comes with medium sized pillows fitted, but also includes small and large size pillows in the same packaging. Nice!

In summary, the Nasal Pillow Mask is the most versatile, and it would be almost impossible to get the wrong size.

This is the type of mask that I use and recommend, but you may need a chin strap if you are a 'mouth breather'

If you are looking to purchase a Nasal or Full Face mask on-line, it would be best to buy based on previous experience, such as choosing the mask you used during your CPAP trial. You could also get your sized checked at your local CPAP shop and buy from them or use the measurement technique shown above if purchasing online.

Last updated 27th April 2019