Young man asking about his eyeglass size
How To Measure Your Glasses Frame Size


Frame sizes

How to measure glasses frame size is indicated by three numbers stamped on the inside of your eyeglasses. These numbers usually appear on the inner surface of one of the frame temples that hold your glasses in place behind your ears.

The secret to ordering a perfectly fitting pair of eyeglasses online is simple: know how to measure glasses frame size. The frame size of eyeglasses and sunglasses uses the same three key measurements:

  • Eye Size: the width of the frame around the lens
  • Bridge Width: the width of the frame across your nose
  • Temple Length: the length of the arm of the glasses from the front of the frame to behind your ear
eyeglass frame size

Important things to Look out for When Determining Your Glasses Frame Size

There can be quite a few different kinds of numbers and markings inside your frame, and not all of them are relevant to the size.

Firstly, the eye size and bridge size, are often located next to one another. But are sometimes, separated by a square box icon. The temple size may immediately follow those two sets of numbers, or have some other info in between.

You are looking for (2) two-digit numbers and one three-digit number. Here’s how to identify them:

Eye Size: A Two-Digit Number In The 40 – 62 Range

Bridge Size: A Two-Digit Number In The 14 – 24 Range

Temple Size: A Three-Digit Number In The 120 – 150 Range

The eye size is the most important number to pay attention to, and most importantly, depending on the style of frames you choose, you can go up or down by one and still find a decent fit.

Lens Width & Frame Size Chart

Frame SizeEyeglassesSunglasses
SmallBelow 48 mmBelow 55mm
Medium48 mm- 55 mm56 mm- 64 mm
LargeAbove 55 mmAbove 64 mm
Frame Size Chart

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