"What's my face shape?" is one of the most-searched face questions, usually for hairstyles or glasses. It also happens to be one of the biggest single factors in which characters a face-matching AI puts you next to. Here's how to find yours with a mirror and a ruler, and what it means for your matches.
Four measurements
Stand in front of a mirror with your hair pulled back, or use a front-facing photo. Measure, or just eyeball with a ruler held up to the mirror:
- Forehead width, across the widest part, roughly halfway between eyebrows and hairline.
- Cheekbone width, across the most prominent points just below the outer corners of the eyes.
- Jaw width, from the corner of one jaw (below the ear) to the other.
- Face length, from hairline to the bottom of the chin.
Then note which is widest, how the length compares to the width, and whether the jaw is angular or rounded.
The six shapes
- Oval. Length noticeably greater than cheekbone width; forehead slightly wider than jaw; rounded jaw. The "reference" shape most guides are written around.
- Round. Length and cheekbone width about equal; soft, rounded jaw; full cheeks.
- Square. Length and width about equal, like round, but with a broad, angular jaw and a forehead of similar width.
- Heart. Forehead widest, narrowing to a pointed or narrow chin; often a widow's peak.
- Oblong (rectangle). Length clearly greater than width, with forehead, cheekbones, and jaw all roughly the same width; a longer, straighter outline.
- Diamond. Cheekbones widest, with both forehead and jaw narrower; a pointed chin.
Most people are between two shapes. That's normal; pick the closer one, or just describe it as "oval leaning square".
Common mistakes
Hair changes the apparent outline more than anything else, so measure with it pulled back. A photo taken from above narrows the jaw; one taken from below widens it. A big smile widens the lower face. And the wide-angle distortion of a close-up selfie rounds everything, so hold the camera at arm's length.
Why outline matters so much to the AI
The neural network behind a face test responds strongly to large, low-detail structure: the overall silhouette of the face, the ratio of length to width, where the jaw turns. Those are among the first things its deeper layers encode, before finer features like eye shape. In practice, a long oblong face will drift toward characters drawn or cast with long faces, a square jaw toward strong-jawed ones, and a heart shape toward characters with wide foreheads and small chins. It isn't the only factor, but if you look at your top three matches side by side, you'll usually see the outline they share with you first.
What it's not
Face shape isn't a beauty ranking. Every shape has famous, striking faces in it, and the AI has no opinion about which is better; it only measures which is closer. If you'd like to see the shape factor at work, run any test twice: once with hair down over the sides of your face and once with it pulled back, and watch how the results shift. The photo guide explains why.