Canthal Tilt Calculator

Canthal tilt is the angle of the line running from the medial canthus (the inner corner of the eye, closest to the nose) to the lateral canthus (the outer corner of the eye), measured relative to horizontal. If the outer corner sits higher than the inner corner, the tilt is positive (upturned). If the outer corner sits lower, the tilt is negative (downturned). The term comes from oculoplastic and craniofacial literature, where canthal position is assessed as part of eyelid and orbital anatomy.

Clinically, canthal tilt is measured by drawing a line between the medial and lateral canthus and measuring its angle against a horizontal reference (often the pupil line or the Frankfurt horizontal plane). This calculator automates that process: it detects 478 facial landmarks with MediaPipe, locates the inner and outer corner of each eye, and computes the angle of the line between them in degrees for each eye individually and as an average.

A positive canthal tilt means the lateral (outer) canthus sits higher than the medial (inner) canthus — the outer corner of the eye angles upward. This calculator labels average tilts above +2° as positive. A pronounced positive tilt is the geometric trait behind the popular "fox eye" or "hunter eye" look.

A negative canthal tilt means the lateral (outer) canthus sits lower than the medial (inner) canthus — the outer corner of the eye angles downward. This calculator labels average tilts below −2° as negative. This is the geometric trait behind terms like "hound eye," "droopy eye," or "puppy-dog eyes."

There is no scientifically validated "ideal" canthal tilt. Some aesthetic literature and cosmetic marketing describe a mildly positive tilt (roughly 4–10°) as a classically favored trait in certain beauty standards, but this is a subjective cultural preference, not a biological or medical benchmark. A neutral or negative tilt is completely normal and extremely common — canthal tilt varies naturally by ancestry, individual bone structure, and even side-to-side within the same face.

"Fox eye" (also called hunter eye or cat eye) describes a positive canthal tilt, where the outer corner of the eye sits higher than the inner corner, creating an upward-angled, lifted appearance. "Hound eye" (also called puppy-dog eyes) describes a negative canthal tilt, where the outer corner sits lower than the inner corner, creating a soft, downward-angled appearance. Both are simply opposite ends of the same geometric measurement — neither is inherently better or worse.

Yes — procedures that adjust the position of the outer canthus exist in oculoplastic and aesthetic surgery, most commonly called canthoplasty (which can reshape or resize the corner of the eye) and canthopexy (which repositions and supports the outer canthal tendon without cutting it, often to correct or create a more lifted tilt). These are real surgical and minimally invasive procedures performed by qualified surgeons. This calculator provides an educational geometric measurement only — it is not medical advice, and any decision about a procedure should be made with a board-certified oculoplastic or facial plastic surgeon.

Canthal tilt is one of many geometric traits that some observers associate with certain beauty trends, but research on facial attractiveness consistently points to symmetry, feature averageness, skin quality, and expression as far stronger predictors of perceived attractiveness than any single angle measurement. Canthal tilt is a descriptive geometric trait, not a determinant of beauty, health, or worth.

Canthal tilt can shift gradually with age as skin elasticity decreases and supporting ligaments (including the lateral canthal tendon) loosen, which can cause a mildly positive tilt to become more neutral or even slightly negative over time. Significant, deliberate changes to canthal tilt generally require a surgical or minimally invasive procedure such as canthopexy — the tilt does not change meaningfully through exercises, makeup, or non-surgical products, despite some marketing claims.

Accuracy depends heavily on photo quality. A clear, front-facing photo with both eyes fully open, even lighting, and no head tilt gives the most reliable angle measurement. A tilted head, squinting, heavy eye makeup that obscures the true corner of the eye, or an extreme camera angle can shift the detected landmark positions and change the reported degrees. The tool reports the raw measured angle for each eye so you can judge the numbers directly rather than relying only on the category label.

No. This calculator is an educational, geometry-based tool intended for curiosity and self-exploration — it is not a diagnostic or medical device and does not provide medical advice. If you are considering a procedure such as canthoplasty or canthopexy, or have any concern about your eyelid or orbital anatomy, consult a board-certified oculoplastic surgeon or ophthalmologist.

Mild left-right facial asymmetry is present in nearly every face, and canthal tilt is no exception — most people have a slightly different tilt angle on each side. This calculator flags a difference greater than 3° as noteworthy, but small differences are normal and not a cause for concern.

The calculator uses MediaPipe's 478-point face mesh to locate the medial canthus (inner eye corner) and lateral canthus (outer eye corner) of each eye, then computes the angle of the line connecting them relative to horizontal. This is the same underlying eye-corner geometry already used elsewhere on this site for eye shape classification (upturned vs. downturned) and eye spacing measurement — expressed here as a precise signed angle in degrees instead of a category alone.

Canthal tilt is purely a matter of individual bone and soft-tissue structure around the eye, and it varies naturally across all populations and genders. Some population-level studies note average tendencies in canthal angle across different ancestries, but individual variation within any group is large — there is no single "typical" tilt for any demographic, and this calculator measures the same geometry identically regardless of who is being measured.

Makeup and eyeliner do not change your underlying bone and soft-tissue canthal tilt, but heavy winged eyeliner or false lashes extending past the natural corner of the eye can visually mimic a more positive tilt in a photo — and can also shift where this tool detects your outer eye corner landmark, slightly skewing the measured angle. For the most accurate reading of your natural tilt, use a photo without heavy corner-altering eye makeup.