Canthal Tilt Calculator
Measure the angle between your inner and outer eye corners in degrees, for each eye, after levelling your head.
Free no signup478 landmarksOn-device no upload~3 s to result
Front-facing · neutral expression · even light
Add a selfie to begin
Method
How it works and the exact formula
Canthal tilt is the angle of the line from the inner corner of your eye (the medial canthus, or endocanthion) to the outer corner (the lateral canthus, or exocanthion), measured against a horizontal reference. When the outer corner sits higher than the inner corner, the tilt is positive and the eye reads as upturned or almond-shaped; when it sits lower, the tilt is negative and the eye reads as downturned or softer. Looksmaxxing communities call a clearly positive tilt with low-set upper lids 'hunter eyes'.
The hard part is choosing the horizontal. If you simply use the edge of the photo, any head tilt goes straight into the result: tilting your head 4° to the left raises one eye's measured tilt by 4° and lowers the other by 4°. This calculator first finds both iris centers (MediaPipe landmarks 468 and 473), computes the angle of the line between them and rotates the whole landmark set so that interpupillary line is exactly horizontal. Every canthal angle is measured after that correction.
For each eye we take the inner-corner landmark (133 on one side, 362 on the other) and the outer-corner landmark (33 and 263) and compute the angle of the vector between them with atan2. The sign is chosen so that an outer corner above the inner corner is always positive, regardless of side. You get the left and right tilt separately, which is useful because a difference of 2° or more between eyes is common and often explains why one eye looks 'sleepier' in photos, plus the average that the scanner scores.
The score uses a Gaussian curve centered at +5.5° with a tolerance of 4°, so tilts between about +2° and +9° score well. That range reflects published measurements of eyelid shape across populations, where mean intercanthal inclination is mildly positive, and the common aesthetic preference for slightly upturned outer corners. Remember that eyelid exposure, brow position and lashes change how tilt reads far more than a degree or two of difference in the angle.
Formulas
- Head roll
- θ = atan2(y473 − y468, x473 − x468)
- Levelled points
- P′ = R(−θ) · (P − L168) + L168
- Tilt per eye
- tilt = atan2(y_inner − y_outer, |x_outer − x_inner|) · 180 ÷ π (positive = outer corner higher)
- Average
- tilt_avg = (tilt_left + tilt_right) ÷ 2
- Score
- 100 · e^(−½ · ((tilt_avg − 5.5) ÷ 4)²)
MediaPipe landmarks used
| Anatomical point | Index | Role |
|---|---|---|
| Iris centers | 468 / 473 | Define the interpupillary line used to level the whole face before any ratio is computed. |
| Endocanthion (inner corner) | 133 / 362 | Start of the canthal vector for each eye. |
| Exocanthion (outer corner) | 33 / 263 | End of the canthal vector for each eye. |
| Glabella | 168 | Rotation center for roll normalization. |
| Upper / lower lid | 159 / 145, 386 / 374 | Used by the symmetry test to check eyelid height differences. |
Benchmarks
Canthal tilt bands and how the scanner scores them
| Metric | Band | Value range | Tool score | Modelled percentile |
|---|---|---|---|---|
| Canthal tilt | Strongly positive | +9° – +12° | 27–68 | 3rd–67th |
| Canthal tilt | Positive ('hunter') | +4° – +8° | 82–100 | 89th–99th |
| Canthal tilt | Mildly positive | +2° – +4° | 68–93 | 67th–97th |
| Canthal tilt | Neutral | -2° – +2° | 17–68 | 1st–67th |
| Canthal tilt | Negative | -6° – -2° | 2–17 | 1st |
Left and right eyes commonly differ by 1–3°. Percentiles are modelled from the reference distribution our scorer uses (scores are mapped through a normal curve, mean 60, SD 18), not from a database of user faces. We don't build one: selfies are deleted within 2 hours and free scan results after 48 hours.
Styling
Styling and virtual try-on by result
Bone structure fixes the canthal angle, but brows, liner, lashes and frames change which way the eye appears to point. Use your measured tilt to choose the moves that work with your eye shape.
Positive tilt (+4° or more)
Your eyes already read lifted. Keep liner thin and follow your natural line; cat-eye frames and upswept brows can overdo it, so prefer straight-browline or round frames for balance.
Find frames for upturned eyesNeutral tilt (−2° to +2°)
Neutral eyes are the most versatile. A slight wing, lifting the tail of the brow and lightly upswept frames (soft cat-eye, browline) add the impression of tilt.
Try browline and cat-eye framesNegative tilt
Focus on the outer third: lift the brow tail, keep lower liner off the outer corner, curl lashes upward at the edge and choose frames whose top line rises toward the temples.
Rate a frame on your faceOne eye lower than the other
Frames with a strong, level top bar give the eyes a straight reference and hide a 1–3° difference. Shape the higher brow slightly lower rather than lifting the lower one.
Check your eye symmetryHair
Curtain bangs and face-framing layers that start at the cheekbone pull the eye outward and upward. Heavy fringes that sit on the lashes hide tilt entirely.
Preview face-framing layersCanthal Tilt Calculator: frequently asked questions
What is a good canthal tilt in degrees?
Mildly positive tilts of about +4° to +8° are the most commonly cited aesthetic range, but neutral tilts between −2° and +2° are extremely common and look perfectly normal. The scanner scores tilts between about +2° and +9° highly.
What are hunter eyes and does this test detect them?
'Hunter eyes' is a looksmaxxing term for eyes with a positive canthal tilt, little visible upper eyelid and a low, straight brow. This calculator measures the tilt part precisely. Lid exposure and brow position are not scored, so a positive tilt alone does not mean hunter eyes.
Why is my canthal tilt different for each eye?
Small left-right differences of 1–3° are normal and come from natural asymmetry in the orbit and eyelid. Head tilt can exaggerate them, which is why we level the face on the iris line first. A large, sudden change should be checked by a doctor.
Can you change your canthal tilt naturally?
Not the bony angle. Brow lifting, eyeliner placement, lash curling and frame shape change how the tilt reads. Claims that exercises or 'mewing' change canthal tilt are not supported by evidence.
Is negative canthal tilt unattractive?
No. Many well-known actors have neutral or negative tilts, which read as gentle and approachable. Canthal tilt is one small input into facial harmony; expression, brows and skin matter far more in real life.
How accurate is a canthal tilt calculator from a selfie?
On a sharp, frontal photo the eye-corner landmarks are stable to within a pixel or two, which is about ±1° on a typical selfie. Looking up or down, squinting or smiling changes the result, so use a relaxed, straight-ahead photo.
Does smiling change canthal tilt?
Yes. A genuine smile lifts the lower lids and cheeks and can raise the measured tilt by a degree or more. Use a neutral expression when you want to compare results over time.
References
- Rhee SC, Woo KS, Kwon B (2012). Biometric study of eyelid shape and dimensions of different races with references to beauty. Aesthetic Plastic Surgery 36(5):1236–1245.
- Kartynnik Y, Ablavatski A, Grishchenko I, Grundmann M (2019). Real-time Facial Surface Geometry from Monocular Video on Mobile GPUs. CVPR Workshop on Computer Vision for AR/VR.
- Little AC, Jones BC, DeBruine LM (2011). Facial attractiveness: evolutionary based research. Philosophical Transactions of the Royal Society B 366:1638–1659.
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