Free eyewear & proportion tool
Face Shape Calculator And Sunglasses Frame Matcher
An oval face has a length-to-cheekbone ratio between 1.35 and 1.55; under 1.35 is round or square, and 1.55 or above is oblong. Example: Your face shape is Oval (length-to-cheekbone ratio 1.39). Best sunglasses: Aviator, Wayfarer, Geometric, Cat-Eye. Enter your four measurements below to see your exact facial ratios, live contour diagram, and best sunglasses, haircuts, and necklines.
Your result
Oval Face
Your face shape is Oval (length-to-cheekbone ratio 1.39). Best sunglasses: Aviator, Wayfarer, Geometric, Cat-Eye.
Best sunglasses and eyewear
Aviator, Wayfarer, Geometric, Cat-Eye. Avoid: oversized frames that extend far past your cheekbones and hide your natural symmetry.
Hairstyles and necklines
Hair: Almost any cut works: blunt bobs, side-swept waves, or slick-back styles that keep the face open. Necklines: All necklines work well; boat necks, V-necks, and structured lapels frame the collarbone cleanly.
Styling tips for an oval face
- Choose frames as wide as (or slightly wider than) the broadest part of your face.
- Walnut, tortoiseshell, and metallic aviators highlight balanced cheekbones.
- Keep the top bar of the frame aligned with your natural brow line.
How the face shape and sunglasses matcher works
- Length-to-width index divides your face length (hairline to chin) by your cheekbone width, following Farkas facial anthropometry.
- Contour taper ratios compare your forehead and jawline against your cheekbones to distinguish oval, heart, diamond, and triangle shapes.
- Oppositional frame geometry matches curved frames to angular faces (square, diamond) and structured angular frames to soft faces (round).
- Hair and collar balance applies the same vertical vs horizontal optical rules to necklines, lapels, and haircuts.
Face shapes and best sunglasses chart
| Face shape | Key ratio / rule | Best sunglasses | Frames to avoid |
|---|---|---|---|
| Oval | Face length about 1.35 to 1.55 × cheekbone width, with cheekbones wider than the forehead and a softly rounded jawline. | Aviator, Wayfarer, Geometric, Cat-Eye | Oversized frames that extend far past your cheekbones and hide your natural symmetry. |
| Round | Face length and cheekbone width within 15% of each other (length ÷ cheekbones < 1.35) with soft, curved jaw contours. | Wayfarer, Rectangle, Cat-Eye, Geometric | Small round frames or rimless circles, which echo the curve and make the face appear wider. |
| Square | Face length under 1.35 × cheekbone width, with forehead, cheekbones, and jawline all within 10% of each other. | Round, Oval, Aviator, Browline | Sharp, boxy rectangular frames that emphasize jaw corners. |
| Oblong (Rectangle) | Face length at least 1.55 × cheekbone width, with forehead, cheekbones, and jawline similar in width. | Oversized Wayfarer, Aviator, Clubmaster, Round | Narrow, shallow rectangular frames that make the mid-face look longer. |
| Heart | Forehead or cheekbones at least 15% wider than the jawline (jaw ÷ cheekbones ≤ 0.85), tapering to a narrow chin. | Aviator, Round, Rimless, Cat-Eye | Heavy, decorative top bars that add extra bulk to the upper forehead. |
| Diamond | Cheekbones at least 12% wider than both the forehead and the jawline (forehead ÷ cheekbones ≤ 0.88 and jaw ÷ cheekbones ≤ 0.88). | Cat-Eye, Browline, Oval, Horn-Rimmed | Narrow frames that are narrower than your cheekbones, which make temples look pinched. |
| Triangle (Pear) | Jawline at least 10% wider than the forehead (jaw ÷ forehead ≥ 1.10), with a narrower temple line. | Browline, Cat-Eye, Aviator, D-Frame | Low-slung, bottom-heavy frames that sit wide on the cheeks. |
Most people sit close to two shapes—for example, an oval face with a slightly square jaw. Use your primary shape for frame width and your secondary trait to choose between curved or angular rims.
Sources and method
- Anthropometry of the Head and Face (Leslie G. Farkas, 1994): facial index (length ÷ bizygomatic breadth) and contour classifications
- Eyewear and face shape dispensing guidelines (The Vision Council): optical frame geometry and bridge balance
- SimplyStylo methodology: how every tool is built and checked
Frequently asked questions
How do I know my face shape for sunglasses?
Measure four distances across your face in front of a mirror: forehead width, cheekbone width, jawline width, and total face length from hairline to chin. An oval face is about 1.35 to 1.55 times as long as it is wide at the cheekbones; a round or square face is under 1.35; an oblong face is 1.55 or more.
What sunglasses suit a round face?
Angular frames such as wayfarers, rectangular frames, geometric shapes, and upswept cat-eyes suit a round face best. Their straight lines and crisp corners add definition and visually lengthen the face, whereas small round lenses emphasize fullness.
What sunglasses look best on a square face?
Round, oval, teardrop aviator, and classic browline (Clubmaster) sunglasses flatter a square face. Curved rims and thinner metal bridges soften a strong, angular jawline and wide forehead.
What is the golden ratio or facial index for an oval face?
In facial anthropometry (Farkas, 1994), a mesoprosopic or balanced oval face has a length-to-cheekbone width ratio between 1.35 and 1.55, with the forehead slightly wider than the jaw and cheekbones forming the widest horizontal line.
What frames fit a heart-shaped or diamond face?
Heart-shaped faces (wider forehead, narrow chin) suit aviators, round frames, and light or rimless bottom edges that add width lower down. Diamond faces (widest at the cheekbones) look best in browline, cat-eye, and oval frames that balance narrow temples.
How wide should sunglasses be for my face?
Your frame width should match your cheekbone width within 2 to 3 millimeters so the temples neither pinch your head nor extend far past your face. Most medium adult frames measure 135 to 142 mm across the front.
Does face shape also affect necklines and shirt collars?
Yes. Visual balance works the same way below the chin: round and square faces benefit from V-necks and open collars that lengthen the neck, while oblong faces look balanced in crew necks, boat necks, and spread shirt collars.