INPUT
One clear front view
Unusable images are rejected instead of receiving a guessed score.
CANTHAL TILT · FREE · ON-DEVICE
Canthal tilt, in degrees, for each eye.
Canthal tilt is the angle from the inner corner of the eye to the outer corner. This test measures it after removing camera roll, reports it separately for the left and right eye, and states the sign convention so the number can be read without guessing. It is a standalone measurement and is not part of the 0–100 composite.
Free scan · processed on your device · no photo upload · no account
OUTPUT
0–100 and 0–10
Four integer sub-scores, measured values, and reference bands are shown.
PRIVACY
On-device only
Photos and measurements do not leave this browser for the free scan.
01
How the Canthal Tilt Angle Is Measured
Four landmarks are used: the inner and outer corner of each eye. The engine rotates the face upright first, then takes the angle between the inner-to-outer vector and the horizontal, using atan2 for a signed result in degrees. Rotating first is the whole point — without it, a head tilted five degrees reports five degrees of canthal tilt that the face does not have.
02
Positive and Negative Canthal Tilt
The sign convention is stated rather than implied: positive means the outer corner sits higher than the inner corner, for both eyes. Negative means the outer corner sits lower. Left and right are reported separately, because they are frequently not the same number and averaging them would hide that.
03
The Reference Value
The canonical face measures 1.74 degrees on both eyes, and the reference band is that value plus or minus 2 degrees. That tolerance is a fixed engineering tolerance chosen for the measurement, not a population norm — nobody has surveyed a population here, and the page will not imply one.
04
Canthal Tilt Test Limits
This is a front-view angle in the image plane. A turned head projects the eye corners onto different positions and is rejected by the pose gate rather than measured. Eyelid shape, the position of the eye within the socket, and anything requiring depth are not measured at all.
05
Not Part of the Score
Canthal tilt does not feed the 0–100 composite. That number is built from exactly four weighted dimensions — symmetry 35%, facial thirds 25%, facial fifths 25%, golden ratio 15% — and adding a fifth input would break a promise printed on every page of this site. Canthal tilt is reported next to the score, not inside it.
06
Nothing Is Uploaded
The eye-corner coordinates are computed in your browser and stay there. No photo, no landmark, no angle, and no record of the measurement reaches our servers. There is no account and no payment.
FAQ
Questions, answered plainly.
What is canthal tilt?+
It is the angle of the line from the inner corner of the eye to the outer corner, relative to horizontal. A positive tilt means the outer corner sits higher; a negative tilt means it sits lower.
How is canthal tilt measured in this test?+
From four landmarks — the inner and outer corner of each eye — after the face has been rotated upright and rescaled. The angle is computed with atan2 and reported in degrees, separately per eye.
What canthal tilt does the reference face have?+
1.74 degrees on both eyes, with a fixed reference band of plus or minus 2 degrees around it. That band is an engineering tolerance, not a statement about what is common or desirable.
Why are my two eyes different?+
Because they often are, and the measurement reports each eye rather than averaging. Detection noise also contributes, which is why a tolerance band is shown instead of a bare number.
Does canthal tilt affect my face rating?+
No. The 0–100 composite uses four weighted dimensions and canthal tilt is not one of them. It is measured and displayed alongside the score, never folded into it.
Can this measure canthal tilt from a side photo?+
No. A turned head is rejected by the pose gate before any angle is computed, because projection moves the eye corners in a way the front-view measurement cannot undo.
Ready to see the measurement?
Run the free scan in your browser. You will see the score, fixed weights, measured dimensions, and limits together.