Choosing the right CPAP mask size is important for comfort and effective therapy. Use this quick guide to measure at home and find your best fit.

 

🛠 What You’ll Need

• A ruler or measuring tape (in millimeters)

• A mirror (optional)

• Good lighting

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👃 Step 1: Measure Your Nose Width

1. Look in the mirror or ask someone to help.

2. Measure the width of your nose at its widest point (just above the nostrils).

   • Small noses often measure less than 35 mm

   • Medium noses are 35–45 mm

   • Large noses are more than 45 mm

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😮 Step 2: Measure Nose Length (For Nasal Masks)

1. Measure from the bridge of your nose (between the eyes)

2. Down to the base of your nose (just above the upper lip).

   • Small: under 40 mm

   • Medium: 40–50 mm

   • Large: over 50 mm

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🫧 Step 3: For Full-Face Masks

1. Measure from the bridge of your nose to the dent between your lower lip and chin.

   • Small: under 90 mm 

   • Medium: 90–110 mm

   • Large: over 110 mm 

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📌 Pro Tips

• A mask that’s too small will pinch and leak air.

• A mask that’s too big will slide around and reduce effectiveness.

• Always try to measure while sitting upright, not lying down.

• If you’re between two sizes, choose the smaller size for a snug fit.

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🎯 Quick Reference Chart