Face Form Finder
Glasses for Square Face: Size Chart With Real Frame Measurements
If you have a square face, reach for round or oval frames. Below is a side-by-side size chart of frames that suit a square face, pulled directly from brand product pages.
A square face has a strong jawline, broad forehead, and similar width across forehead, cheeks, and jaw. To balance those angles, choose round, oval, or cat-eye frames — their curves soften the jaw and add contrast. Avoid square or rectangular frames that echo the face's geometry. Pick a frame whose total width sits close to the widest part of your face. Before you buy, check the three measurements on every frame product page: lens width, bridge width, and temple length. Not sure you have a square face? Use the face shape detector to check your four image measurements.
Square-Face Frame Size Chart
Every row below was copied from a brand's own product page on 13 September 2026. Nothing is estimated or averaged. All measurements come from US product pages.
| Brand | Model | Frame Shape | Lens Width | Bridge Width | Temple Length | Scraped |
|---|---|---|---|---|---|---|
| Zenni | #P156021 | Round | 49 mm | 19 mm | 135 mm | 2026-09-13 |
| Zenni | #4429515 | Round | 48 mm | 19 mm | 145 mm | 2026-09-13 |
| Zenni | #125716 | Round | 49 mm | 18 mm | 148 mm | 2026-09-13 |
| Zenni | #450014 | Round | 42 mm | 27 mm | 138 mm | 2026-09-13 |
| Zenni | #2029515 | Oval | 48 mm | 21 mm | 145 mm | 2026-09-13 |
| Ray-Ban | RB3447V Round Metal Optics | Round | 50 mm | 21 mm | 145 mm | 2026-09-13 |
| Firmoo | JY1089 | Round | 53 mm | 18 mm | 145 mm | 2026-09-13 |
Source notes: All seven rows — measurements from brand official US product pages (zennioptical.com, ray-ban.com, firmoo.com). Zenni rows: all three measurements visible on the product page. Ray-Ban RB3447V: lens width 50 mm and bridge width 21 mm shown as "SIZE 50-21" on the product page; temple length 145 mm confirmed from the page's embedded product data. Firmoo JY1089: all three measurements shown as "Size: 53-18-145" in the specifications section. All pages were accessed on 13 September 2026. See the CSV for full source URLs.
The same size chart is available as a CSV file so you can sort it, compare it against a frame you already own, or take it shopping.
How to Read the Three Numbers
Every pair of glasses has three key measurements printed or listed. Here is what each one means for a square face:
- Lens width — the horizontal width of one lens. For a square face, a lens width between 48 and 54 mm keeps the frame proportional without overpowering an already structured jaw. Round and oval lenses add curves where the face has angles.
- Bridge width — the distance between the two lenses. A wider bridge (19–27 mm) distributes weight across a broader nose and prevents the frame from pinching. A narrower bridge sits higher. The right number depends on your nose, not your face shape.
- Temple length — the length of the arm from hinge to ear bend. Most adult frames fall between 135–148 mm. Temple length matters for whether the frame stays put behind your ear, not for whether the shape looks right on a square face.
Not sure how to measure your own face? See the face shape chart for how forehead, cheekbone, jaw, and face-length readings are taken.
Unit Conversion: Millimetres to Inches
Some brands list sizes in millimetres; others show inches. If you need to convert, use 1 inch = 25.4 millimetres. Below are worked examples using actual rows from the table above.
Example 1 — Zenni #P156021 (lens width)
Convert 49 mm to inches:
→ 1.93 in (rounded to two decimals)
So the Zenni #P156021 lens width of 49 mm is roughly 1.93 inches.
Example 2 — Zenni #450014 (bridge width)
Convert 27 mm to inches:
→ 1.06 in (rounded to two decimals)
So the Zenni #450014 bridge width of 27 mm is roughly 1.06 inches.
Example 3 — Zenni #125716 (temple length)
Convert 148 mm to inches:
→ 5.83 in (rounded to two decimals)
So the Zenni #125716 temple length of 148 mm is roughly 5.83 inches.
Going the other way — inches to millimetres — multiply by 25.4 instead of dividing.
What the Size Numbers Cannot Tell You
Round curves and the right millimetres are a useful starting point. They do not guarantee comfort. Three things that the three-number size does not capture:
- Nose pads and bridge fit. A square face often comes with a broader nose. Adjustable nose pads let you fine-tune height and prevent slipping. A fixed saddle bridge is lighter but harder to adjust if your nose does not match the moulded shape.
- Temple pressure and grip. Temple length describes how long the arm is, not how tightly it curves behind your ear. A frame with the right millimetres can still feel too tight if the temples bow inward, or slide forward if they bow outward. Spring hinges help, but they are not a substitute for trying the frame on.
- Lens weight once glazed. A frame that feels light with demo lenses may feel noticeably heavier once your prescription is cut in. Higher prescriptions mean thicker and heavier lenses, which can shift how the frame sits on your nose and whether it slides.
Honesty note. This page gives you size numbers and shape direction for square faces. It is not a fitting guide and it cannot tell you whether a specific frame will feel good on your face. The only way to know is to put the frame on, wear it for at least ten minutes, and check for sliding, pressure marks, and comfort when you look down.
More Face-Shape Guides
If you found this page useful, you may also want to check:
- Face Shape Detector — upload a photo and see your four image measurements in the browser.
- Face Shape Chart — how seven shapes are read from forehead, cheekbone, jaw, and face-length readings.
- Different Face Shapes — an overview of each shape and what to look for.
- How to Find Your Face Shape — a step-by-step measurement method you can do at home.
- Glasses for Round Face — the companion size chart for round faces.
- Glasses for Oval Face — the companion size chart for oval faces.
- Best Haircut for Square Face — short styles that work with a square jaw.
- Haircut for Square Face Female — if you are also thinking about a haircut to pair with new frames.
- Haircuts for Face Shapes — an overview of haircuts by face shape.