Eyeglass Case Size Guide: How to Measure Your Frames

Choose an eyeglass case by measuring the glasses while they are folded at their widest, tallest and deepest points, then comparing those numbers with the case's usable interior dimensions. Allow enough clearance for the frame to enter and close without pressure, but avoid excessive empty space that lets the glasses rattle against hard surfaces.

Frame size numbers do not equal case size

The familiar numbers printed inside a temple usually describe lens width, bridge width and temple length. They help identify frame size, but they do not tell you the full outside width, lens height, wrap curvature or folded depth. Those external measurements are what a case must accommodate.

How to measure glasses for a case

1. Fold the temples normally. Do not force them flatter than their natural position.
2. Measure outside width. Record the widest point from one frame edge to the other.
3. Measure height. Record the tallest point, including the frame around the lens.
4. Measure folded depth. Place the folded glasses on a flat surface and measure from the surface to the highest point.
5. Note unusual geometry. Wraparound curvature, thick temple tips, shields and prominent nose pads can need extra room.

Use millimetres for easy comparison and write all three external measurements together.

Compare usable interior dimensions

Exterior case dimensions can be misleading because shell thickness, padding and hinge hardware reduce the space inside. Look for internal dimensions or physically test the fit. The frame should sit without the bridge, lenses, hinges or temple tips being pressed by the lid.

Width

Allow space for the widest edge to enter without scraping. Oversized fashion frames and shields commonly need more width.

Height

Lens height matters for aviator, cat-eye and deep-lens shapes even when frame width appears standard.

Depth

Wraparound sunglasses and thick folded temples often fail here. The lid must close without compressing the frame.

A five-step fit test

1. Place clean, dry glasses into the case with the temples folded normally.
2. Confirm the lenses do not touch exposed hardware or a rough surface.
3. Close the lid with one hand and no downward force.
4. Open it again and inspect whether the frame shifted, bowed or caught on the closure.
5. Gently move the closed case. A little movement may be acceptable, but hard rattling calls for better support or a closer fit.

Hard case, soft pouch or semi-rigid?

A hard shell provides better resistance to crushing inside bags and luggage. A soft pouch saves space and helps with light scuff protection but does not prevent compression. A semi-rigid case can balance structure and bulk. Size and fit remain important with every construction type.

Common sizing mistakes

• Using only lens width and bridge numbers
• Comparing frames with a case's exterior rather than interior dimensions
• Ignoring folded depth and wrap curvature
• Forcing the lid closed against hinges or temple tips
• Choosing a very large case without internal support
• Storing damp glasses in a closed case

Frequently asked questions

How much extra room should a glasses case have?

Enough for easy entry and a pressure-free closure, but not so much that the eyewear strikes the shell. Because lining and geometry vary, a fit test is more reliable than one universal clearance number.

Do printed frame measurements include total width?

Usually not. They normally identify lens width, bridge width and temple length, so measure the outside frame directly.

Why will my sunglasses not fit a standard case?

Wrap curvature, tall lenses, thick temples or shield designs can increase the folded depth or height.

Should the microfiber cloth stay inside the case?

Only if it is clean and does not create pressure. Do not wedge it tightly against the lenses.

Shop eyeglass cases

Compare sizes and styles in EBJDE Eyeglass Cases & Storage. To choose the protection type after sizing, read Hard vs Soft Eyeglass Cases, or review the broader Eyewear Care and Storage Guide.