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Mask Size Guide Helper

How to Measure Your Face for a Prescription Snorkel & Scuba Mask

Buying a mask online can be tricky — so we built multiple ways to check fit and feel confident the seal will be just perfect.

1

Measure Width

Outer eye corner to outer eye corner in a straight line (don’t wrap).

2

Measure Height

From just under your nose to just above your eyebrow line.

3

Optional: Head Size

Wrap a string around your hat line, mark, then measure. Use the table as a guide.

4

Enter Your Sizes

Use our slider tool to enter your measurements & find your perfect fit.

How to measure your face for a prescription mask

Quick Face-Size Checker

Tips: use a straight ruler (don’t bend it), check in a mirror, or ask a friend to help.

3 Head-Size Checker (Optional)

Measure around the hat line (above ears/brows)

Head-Size to Mask-Size

Measure your head the same way you’d measure for a hat. Use a soft tailor’s tape (or wrap a piece of string/cord), around your head above the ears and just above the eyebrows, then read the length (or measure the string). Keep it level all the way around.

4 Enter Your Sizes
Use the slider to find your perfect fit!

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About the measurements

We measured the relaxed inner seal and the gently stretched outer seal to give a realistic Min/Max window. Your goal is to sit comfortably inside that window, especially on width, so the mask seals without over-tightening the strap.
Remember to keep the measuring device straight without bending around the cxontour of your face.
Lens choice comes after fit
Pick your frame size first. Then choose lens power for your diving mask with prescription lenses using the lens calculator (find below):
Underwater Lens Calculator

Underwater, light bends differently and can make your usual prescription feel too strong.
We lower it slightly to prevent overmagnification and keep your vision clear.
Step 1: Enter your prescription to determine your recommended underwater vision

Choose the sign first:
Use for myopia, + for hyperopia.
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Suggested Lens Strength:

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Left