How to find your glasses size

Finding the ideal eyeglass frame size is super important when buying glasses online. But did you know it's also super-simple? For the great majority of people M is the right size. It is very likely it is going to be the correct size for you too.

To be sure, use one of the following techniques to find the size of the glasses: 

Learn how to read glasses and sunglasses measurements

The best place to start is with the eyeglass measurements on a pair you already own. Take a closer look at the temples (arms) of your eyewear. Search for the three little numbers on the inside of the temple of your glasses. These three numbers are the frame's measurements. They will look somewhat like this: 51□19   144

From left to right, these eyeglass measurements appear in the following order: lens width, bridge width, temple length. Sometimes a fourth number will be noted on the arms, which is your lens height. All of these measurements are in millimeters.

Lens Width
This is the horizontal width of each lens at its widest point. It typically ranges from 40mm to 60mm.
Bridge Width
This is the distance between your two lenses. In short, the bridge width is the space where your frames fit against your nose. The size of this piece ranges from 14mm to 24mm.
Temple Length (Arm Length)
This is the length of the temple from each screw to its temple tip, including the bend that sits on your ear. This measurement does not vary as much as the others. The temple is typically 120mm to 150mm long.
Lens Height
This is the vertical height of your eyeglass lenses at the widest point of the lens within the frame. The lens height is important when measuring bifocals or progressive lenses.

In some cases you will know the Width of the Whole Frame.

This measurement is not printed on the temple of your glasses. To find it, take your measuring tape and measure horizontally across the front of your frames, including any hinges or design features that stick out on the sides.

Converting measurements to glasses size

Once you know the measurements of your current glasses, you can easily convert those to sizes - small, medium and large. To do that just add lens width + bridge width.
For example, if measurements are 51□19   144 we can add lense width 51 and bridge width 19 to get 70. Then we consult the tabel below to see that our size would be medium (M).

Convert measurements to size
<66 XS
66-68 S
69-71 M
72-74 L
>74 XL

ℹ️ For all of our glasses we will also show measurements so you can compare those to your previous glasses. Note that even if measurement for lense or bridge width differs by 1mm, the glasses will still be a good fit.

How to find glasses size by measuring with a credit card

Yes, there really is another use of your card, apart from paying for your favourite purchases, and it works. You probably did not know that the size of a credit card in height is approximately the same as the width of a medium size glasses lenses! Below are instructions on how to find your glasses size by using credit card as measuring device.


  • Take any credit or debit card
  • Stand in front of a mirror or place your smartphone somewhere steady and use your selfie camera. Place the credit card on the bridge of your nose and under your eyebrow.
  • If the edge of the card extends further than the edge of your eye, your size is - small (S)
  • If the edge of the card ends at the outer edge of your eye, your size is - medium (M)
  • If the edge of the card ends before the outer edge of your eye, your size is - large (L)


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