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How To Choose Your Correct Sunglasses Size

How To Choose Your Sunglasses Size

When you research purchasing a pair of sunglasses you find that the way sunglass manufacturers indicate the size of the sunglasses is by a number like "58mm" or a simple word like "Large".

The question then becomes what does this mean to you? 


How Lenses Are Measured

When the sunglass size is indicated as "58mm", this refers to the width of one of the lenses in the sunglasses. Above you see an image and the size "58mm" is measurement "A", or the width of one of the lenses at it's widest point.

So to calculate the width of the frame you need to take the "58mm" times 2 (2 lenses) PLUS the DBL (Distance Between Lenses) PLUS the width of the hinges at the sides of the frame.

By way of example if a pair of Randolph Aviator Sunglasses say they have a frame width of 52mm, 55mm or 58mm, the sunglasses are most likely to be" equivalent as follows:

  • Small - 52mm, or 5.000 inches;
  • Medium - 55mm, or 5.250 inches;
  • Large - 58mm, or 5.750 inches.

In some cases they simply label the sunglasses as small, medium, large or extra large. In this case, it is probably best to try them on as these generic words don't really tell you much.

There are many different shapes of our faces ranging from small narrow and heart shaped to large round. The shape of your face will also determine what style sunglasses look good on you, and the size of sunglasses that will fit comfortably on your face.

Measure Across Your Face

Using the information above and the chart below you could also simply measure yourself to learn what the proper frame width should be for your face. Use the following image which shows you how to determine the proper sunglass frame size by measuring your face temple to temple: 

How to measure your face for eyeglasses

Use Your Own Glasses

If you already own a pair of glasses or sunglasses you the first place to look is on the inside of one of the temples. There you should find a set of numbers similar to those in the image below:

 Sizing Informaton On Eyeglass and Sunglasses Temples

Sometimes these numbers can be found under the bridge, the part between each of the lenses. Failing that simply flip them over and measure inside width to determine the best size for you.


The following video demonstrates these principles for determining your frame size:

Standard Sunglasses Frame Sizes

The following chart shows typical sizes for Randolph Engineering sunglasses:
  • 47mm temple to temple width = 114mm or 4.500";
  • 50mm temple to temple width = 121mm or 4.750";
  • 52mm temple to temple width = 127mm or 5.000";
  • 54mm temple to temple width = 130mm or 5.125";
  • 55mm temple to temple width = 135mm or 5.250";
  • 57mm temple to temple width = 140mm or 5.500";
  • 58mm temple to temple width = 146mm or 5.750";
  • 61mm temple to temple width = 152mm or 6.000".

Using this information should make it a simple process for you to understand how to order sunglasses online and get the right sunglasses size.

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Before you leave visit our Sunglasses Store for great deals on sunglasses! 

John M. White a/k/a JetAviator7 from

World Expert On Aviator Sunglasses