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Project N95's Guide to Mask Sizing and Fit

We have compiled a guide to help you find the right fitting N95, KN95, KF94, or other high filtration mask for your face size. Below you will find a chart comparing size by mask type, a guide to determining your face size, a list of common fit issues, instructions for checking if your masks fit, and masks we recommend for different face sizes, shapes, and fit issues.

Sizing on the Project N95 Website

You can use this guide and information placed throughout the Project N95 website to find the right mask for you.

  • Read the size guidance on product pages
  • Filter by size on category pages
  • Read and leave product reviews. If you are comfortable with it, provide face size, shape, and any features that have made it hard for you to find a mask in the past. This can help others find a mask that fits well.
  • Read our mask guides to find masks for specific face sizes.

Mask Size Comparison Chart

Use this chart to understand how different mask sizes are shown on the Project N95 site based on mask type and to understand which face mask size to choose based on your face size.

Face Size N95 KN95 KF94 Other High Filtration Masks
Kids Ages 2-5 N/A Pre-k Extra Small (XS) Pre-K
Kids Ages 6+ N/A Kids/Small Small (S) Kids
Small/Petite S or S/M S or S/M Medium (M) S or S/M
Medium S/M or M/L S/M or M/L Large (L) S/M or M/L
Large M/L or L/XL M/L or L/XL Large (L) M/L or L/XL
Extra Large L/XL or XL L/XL or XL Extra Large (XL) L/XL or XL

BNX KN95 Size Chart

Face Size BNX KN95
Kids Ages 6+ Small
Small/Petite Medium
Medium Large
Large Large

How to Determine Your Face Size

We have put together this handy guide to determine your face size. Figuring out your face size would normally require you to purchase special measurement tools and can get complicated. We have a few quicker and easier tips that can help you determine your face size.

Check the size of your current mask
  • Check the Project N95 website if you have purchased from us in the past to see what size your mask is classified as. You can use the chart we provided above to determine your face size based on the mask you currently wear.
Other information to determine face size

We assessed data provided by NIOSH on face size. We put some of our learnings here that can help you think about and assess your face size.

  • 98% of people identifying as women in the NIOSH survey were classified as having a small or medium sized face by NIOSH. 32% had a small sized face and 66% had a medium sized face. If you are a woman it is likely that you have a small or medium sized face.
  • 4% of people identifying as men in the NIOSH survey were classified as having a small sized face by NIOSH. 56% had a medium sized face, 29% had a large sized face, and 11% had an extra large sized face. If you are a man it is likely that you have a medium, large, or extra large sized face.

How do you know if your mask fits?

Below is a basic guide on how to perform a seal check. Performing this check can help you to understand if your mask fits properly. This is not a comprehensive guide, or a substitute for professional fitting for medical employees or where available for the public.

Step 1: Put your mask on.

Step 2: Adjust the mask to seal it to your face.

Step 3: Feel for air flow around the mask. Cup your hands around the top of your mask and feel for air on your hands. Repeat with the bottom portion of your mask.

If you do not feel the air from the exhalations, your mask fits properly and you are ready to go.

Step 4: Adjust the mask’s placement if needed. Move the mask towards the area where you felt air leaking and press down lightly to readjust the mask. Then reperform the seal check from Step 3 until you no longer feel air escaping from your mask.

Step 5: If you are still feeling air escape from your mask you can try crisscrossing the straps to get a better seal. Again reperform the seal check from Step 3 until you no longer feel air escaping from your mask.

Step 6: Try a new or different mask if you are still not able to get a proper fit after performing the seal check.

Size Guides for Different Face Sizes

Violet Pink BNX Flat-Fold Ear-Loop KN95 Mask Right 3Q View Model
Light Blue Aidway LUVMED 51-9502B N95 Respirator Mask Left Side View Model
Dr. Puri White KF94 Kids Front View Thumbs Up

Mask recommendations by size, shape, features, and common issues

N95 Recommendations
KF94 Recommendations
  • Are you new to wearing a boat shaped mask? Try something with adjustable straps that will have a more versatile fit. You can find a mask with adjustable straps by looking at the product title for a mask.
KN95 Recommendations
  • Are you looking for something tried and true? Most people like the fit of the Powecom KN95 masks.
  • Do you need a mask with a little bit of extra room in the chin? Try the Black or White Kingfa KN95 mask.