{"id":3070,"date":"2026-06-19T10:59:52","date_gmt":"2026-06-19T14:59:52","guid":{"rendered":"https:\/\/www.stage.warby.io\/learn\/?p=3070"},"modified":"2026-06-19T10:59:52","modified_gmt":"2026-06-19T14:59:52","slug":"eyeglass-frame-sizes-explained","status":"publish","type":"post","link":"https:\/\/www.warbyparker.com\/learn\/eyeglass-frame-sizes-explained","title":{"rendered":"Eyeglass Sizes Explained: Decoding the Numbers"},"content":{"rendered":"\n

Have you ever looked on the inside of the arm of your glasses and seen something like 52\u201318\u2013140? That looks more like a password than a size. No wonder most people get confused when trying on glasses, and end up just trying pairs on until something “kind of” fits.<\/p>\n\n\n\n

This guide is here to change that. When you understand eyeglass frame sizes, you can quickly narrow down frames that are more likely to fit your face and feel good to wear.<\/p>\n\n\n\n

In the next few minutes, you’ll get eyeglass frame sizes explained in simple terms-what each number means, what typical ranges look like, and how to use your current glasses as a sizing blueprint.<\/p>\n\n\n\n

By the end, you’ll know how to read the numbers on many frames and how they relate to overall fit and appearance.<\/p>\n\n\n\n

Eyeglass Frame Sizes Explained: What Those Three Numbers Mean<\/h2>\n\n\n\n

Most modern frames print three key measurements inside the temple (arm) or behind the bridge, usually in a format like 50\u201318\u2013140. These numbers are in millimeters and describe lens width, bridge width, and temple length. All About Vision describes lens width, bridge width, and temple length as the three key frame measurements, which is why you see this trio on nearly every pair.<\/p>\n\n\n\n

The first number is lens width (also called eye size). It measures the horizontal width of one lens at its widest point. This typically ranges from about 40\u201360 mm. Smaller numbers are often used for narrower faces or minimalist styles; larger numbers are often used for wider faces or oversized looks.<\/p>\n\n\n\n

The second number is bridge width-the distance between the lenses where the frame rests on your nose. Common bridge sizes run from roughly 14\u201324 mm. A bridge that’s much narrower than your nose can feel too tight; one that’s much wider may allow glasses to sit lower than you expect. This small number can make a noticeable difference in day\u2011to\u2011day feel.<\/p>\n\n\n\n

The third number is temple length, the length of the arms from hinge to tip. Usual lengths are around 120\u2013150 mm. If your temples are much shorter than you need, the frames may press more at the ears; if they’re much longer, they can feel looser. A Verywell Health review by an optometrist breaks down common frame size ranges and how to read the numbers, reinforcing why these measurements matter for real\u2011world fit.<\/p>\n\n\n\n

How Frame Size Relates to Fit and Feel<\/h2>\n\n\n\n

Those millimeters do more than decide whether glasses look big or small on your face. They influence how securely your frames sit and how they feel over the course of the day.<\/p>\n\n\n\n

When frame width and bridge measurements line up reasonably well with your features, your eyes tend to sit closer to the center of each lens. We generally recommend that frame size should match face size and pupil position<\/a> so the eyes land in an appropriate area of the lens.<\/p>\n\n\n\n

Comfort is another key factor. A combination of lens width, bridge size, and temple length can influence how a frame’s weight is distributed across your nose and ears. Frames that are much wider than your face may slide, while frames that are much narrower may feel too snug or create pressure points. Over a full workday, even a 2\u20133 mm difference in the bridge or temple length can make a noticeable difference in how a frame feels.<\/p>\n\n\n\n