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How to find your sunglasses size: Step by step

Woman wearing sunglasses and holding a phone with sunglasses guide

Size does matter, especially when it comes to buying the right pair of sunglasses. Not sure about which size you need?

Then let's find out how to measure your sunglasses frames size.

If you aren't sure how to measure your face shape or to find sunglasses that match your look, read this our sunglasses guide!

1.: Learn how to read sunglasses measurements

Before you write down any numbers, you need to know where to find the size measurements of your sunglasses. So take a closer look at the temples of your sunglasses.

Inside the temple, you'll find numbers that look like this: 51–19–144.

Those measurements translate as:

  • Lens width (e.g 51 mm): Lens width is the horizontal diameter of the lens at its widest point. In optometry, another term used for that is “eye size”.
  • Bridge width (e.g 19 mm): Bridge width is the part that joins the two lenses and sits over the nose. Some refer to this as the “gap”. The bridge width varies between 14 and 24 millimetres.
  • Temple length (e.g 144 mm): The temple is the “arm” that keeps the sunglasses on your face. That “arm” extends to the part that hangs on the ear. The length is usually 135, 140 or 145 millimetres.
  • Lens height: Lens height measures the size of the lens vertically, that is from the top to the bottom of the lens. Although sizes may differ depending on the brand, the standard size is somewhere between 32 and 38 millimetres.
how to read sunglasses measurements - what is lens width, bridge width and temple lenght

2.: Check a pair of old sunglasses

It would be ideal to use a pair of old sunglasses that fit your face perfectly. Alternatively, try on a pair from a friend, in order to see if it fits you.

If you look closely at the inscriptions on its frames, you will see digits that will help you find the right size for your new sunglasses.

Pay attention though, because each pair of sunglasses is different, depending on the manufacturer.

Most often, you'll find the size information on the inside of the left temple.

how to read sunglasses measurements - check a pair of old sunglasses

3.: Measure the sunglasses size with a ruler

If you haven't found any digits or specifications on your old sunglasses, don't panic. Better get ready to show your talent in measurements.

Take a ruler or a tape measure and start to carefully measure the size of the glasses, following the graphic below.

Since we don’t want to confuse you with numbers on our website, we have marked the respective numbers as S, M and L sizes.

how to read sunglasses measurements - Measure sunglasses size with a ruler

Once you have the correct measurements, just head over to our sunglasses section and find your favourite pair.


4.: Use a credit card

Use a credit card. Yes, it is another use of your card, apart from paying for your favourite purchases, but it works. Did you know that the size of a credit card in height is approximately the same as the width of a medium size lens?

The size of most credit cards is 85.60 mm × 53.98 mm (3 3⁄8 × ​2 1⁄8 inches)

Here's how to measure with a credit card:

how to read sunglasses measurements - Measure sunglasses size with a credit card

  • 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, you are a small size (size: S)
  • If the edge of the card ends at the outer edge of your eye, you are a medium size (size: M)
  • If the edge of the card ends before the outer edge of your eye, you are a large size (size: L)

Read more

Style advice and tips for choosing the right sunglasses