Knowing Your Eyeglasses Frame Size

Frame Size

Tip on where to look in the eyeglass frame

Frame size is printed inside most of the frames, except in few cases lettering could be worn out due to daily wear. A frame comprises of the following attributes:

  • Eye Size – The horizontal width between the lenses in millimeters is known as eye size.
  • Bridge Size – It is the measurement in millimeters that joins the two lenses together
  • Temple Size – It refers to the end to end length of the temple that also includes the bend
  • Vertical Size (B)– This is the height of the eyeglass lens, and always measured from the tip to the bottom of the lens aperture of your eyeglass frame. Vertical size isn’t particularly important as we have simplified it by making progressive eyeglasses a percentage such as 70% for distance and 30% for reading.

Best Way to Find What Frame Size I Need

You can either look at the size from your previous eyeglass or sunglass frame. The information is usually depicted in the image as shown below:


Frame Width is the most important measurement. The endpieces are included in the total frame width and they are never measured and/or specified. Frame width is measured from the 2 widest points on the frame. It is calculated by measuring the edge of the lens out to the edge of the frame where the temples are connected. An average endpiece is 2-6 mm for a total of 4-12mm for both.

Note: Compare the width of the frame you like to the ones you’re currently wearing.

or Simply find frames in your size range:


Frame Size

Determining Your Frame Size
Frame Size

Given below are few instructions to determine the best frame size for your face.

  • While looking into a mirror, hold a ruler so that it lines up with your temple. (See illustration)
  • Use a pen/ pencil on each ear to help position each ear.
  • Measure in inches the distance between your temples.
  • To convert your measurement to a frame size: Multiply by 25.4 to get size in mm. If measured in cm multiply by 10.
  • Only order a frame whose total width is within +/- 3mm of your size.

Determining Your Temple Size
Temple arm length is the lenght from the front of the frame to the tip of the temple. An mm or two of difference is not important. You don’t want the eyeglasses to perch at a slant above your ear and distort your angle of vision so you want the temple arm to be long enough. To accommodate your personal size, the angle at the tip of the temple may be adjusted.