Eyeglass Frame Size: Lens, Bridge & Temple Measurements (52-18-140 Chart)

Eyeglass frame size is a set of three numbers in millimeters: lens width, bridge width and temple length. A common example is 52-18-140.

Most adult frames fall near 50 to 54 mm lens width, 16 to 19 mm bridge and 140 mm temples. This guide shows the size chart, how to read the numbers and how to check your fit.

Eyeglass Frame Size Chart: Small, Medium and Large

How to Read Eyeglass Frame Numbers

Look inside the temple arm or behind the nose bridge. You will see three numbers, such as 52-18-140. The first is lens width, the second is bridge width and the third is temple length.

So 52-18-140 means a 52 mm lens, an 18 mm bridge and a 140 mm temple arm. Two more measures, lens height and total frame width, often appear on size charts.

Standard Eyeglass Frame Sizes by Face Width, Shape and Age

Narrow, Average and Wide Frame Sizes

Narrow frames use a lens width of 48 to 50 mm and shorter temples. Average frames use 50 to 54 mm with a 16 to 19 mm bridge.

Wide frames use 54 to 58 mm with slightly longer temple arms for side coverage. Pick the size that matches your face width first.

Eyeglass Frame Sizes by Face Shape

Face shape changes the look, not the size. Round faces often pair with angular frames. Square faces often pair with rounder frames.

Oval faces suit most shapes. Whatever the shape, the frame width should still match your face width.

Children’s and Adult Eyeglass Frame Sizes

Children’s frames are smaller, with narrower lens widths and shorter temples. A child’s face grows fast, so check the fit often.

Adult frames follow the chart above. Teens may sit between small and medium, so measure before you buy.

Measure Glasses Frame Size at Home

How do I know the frame size? Check the printed numbers first. If they have worn off, use a millimeter ruler. Measure one lens horizontally, without the outer frame border.

Then measure the bridge and the temple arm from hinge to tip. To size yourself, measure face width with a ruler or the credit card method. Under 130 mm is small, 130 to 140 mm is medium and over 140 mm is large.

How Should Glasses Fit? Bridge, Temples and Lens Position

A good fit feels light and stable. The bridge should rest on your nose without pinching or sliding. The temples should hold behind the ears without pressure.

A narrow bridge pinches or sits high. A wide bridge lets the frame slide down. Your eyes should sit near the center of each lens, and the frame width should match your face width.

Plastic vs Metal Eyeglass Frame Sizes

Plastic frames (often acetate) are shaped and fixed, so the bridge and temple sizes matter more. Their thicker rims can also look larger than the printed lens width.

Metal frames often have adjustable nose pads and bendable temples. That allows small fit changes, but the printed size numbers still guide your choice.

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Questions

How do I know my glasses frame size?

Check the three numbers printed inside the temple arm of your glasses. They indicate lens width, bridge width, and temple length in millimeters. For example, 53-17-140 means a 53 mm lens, a 17 mm bridge, and a 140 mm temple.

Should I get 52 or 54 glasses?

Choose based on your face width and how the glasses fit. A 52 mm lens may suit narrower faces, while a 54 mm lens may suit wider faces. Compare the measurements of a pair that already fits you comfortably.

What does 53 17 140 mean on glasses?

These numbers represent a 53 mm lens width, a 17 mm bridge width, and a 140 mm temple length. This combination is common in adult glasses, but the overall fit depends on the frame’s shape and design.

What is the most common glasses frame size?

Medium adult glasses commonly have lens widths of 50 to 54 mm and bridge widths of 16 to 19 mm. However, frame sizes vary by brand and style.

What is the typical frame size for eyeglasses?

Typical adult eyeglasses have lens widths of 50 to 54 mm and temple lengths around 135 to 145 mm. Common temple lengths range from approximately 120 to 150 mm, depending on the frame.

How do I know the frame size?

Look for the size numbers printed inside the temple arm. If they are worn off, use a millimeter ruler to measure the lens width, bridge width, and temple length. Compare these measurements with a pair that fits comfortably.