When you’re buying eyewear online, one of the most important factors in your decision is the size of the frame. Will it fit your face? Will it be too wide or too large? For first-time wearers, this can be a bit difficult. But we’re here to help! 

how to read the numbers on your glasses

Most brands have size information that includes three numbers in order: the horizontal lens size, the width of the bridge and the length of the temples, all measured in millimeters (along with other information we’ve shown you how to read above – click to enlarge). These are written on the inside arm of your glasses, typically as 54-16-135. Other times you will just see the first two numbers, such as with MYKITA eyewear below.

Mykita eyewear eyeglasses size

A fourth number, known as the B size, is not often listed but is still important in determining whether the frame will be a good fit for you – we try to provide it in our product information when we can. This is what we list as the “lens height,” or the measurement of the lens in millimeters from top to bottom. With geek-chic eyewear growing in popularity, many designer eyewear styles are becoming larger and taller, so it’s becoming increasingly important to know what will work for you.

Glasses-wearers, simply look at an old pair of glasses to see what your size is. New to specs? Check out some of your sunglasses and see if there are sizes listed, and then scale down accordingly. If you still need some help deciding, here’s our usual guidelines:

  • Extra Small: Lenses that measure 46mm and smaller. (This size is typically found in kids glasses or those with round lenses.)
  • Small: 47mm to 50mm lenses
  • Medium: 51mm to 53mm lenses
  • Large: 54mm to 56mm lenses
  • Extra Large: 57mm lenses and larger

As for the temples, we consider a length of 120mm to be small, 130mm to be medium, and 140mm as large. You can estimate your correct size given these ranges.

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