Canthal Tilt Test
The angle from your inner eye corner to your outer one, measured in degrees rather than argued about. Most people sit between +2° and +8°. The test reads each eye separately, because a two-degree difference between sides is ordinary and a single figure hides it.
- No signup
- No upload
- Free
- ~10 seconds
Click to choose a photo, or drop one here
Straight-on, even lighting, at arm's length gives the most comparable reading.
No photo to hand? Try one of these and see what the tool returns.
Runs in your browser. Your photo is never uploaded.
What is canthal tilt and how is it measured?
Canthal tilt is the angle of the line from the inner corner of the eye (the medial canthus) to the outer corner (the lateral canthus), expressed in degrees. It is set by where the lateral canthal tendon anchors to the orbital rim, which is why it stays stable through weight change and most of adult life.
- Most people measure between +2° and +8°; at or below 0° is a negative tilt.
- Only a canthopexy or canthoplasty changes the angle itself, because it is set by a tendon attachment.
- Mewing and facial exercises do not change canthal tilt — no evidence supports the claim.
- Measuring with the chin tipped down is the most common cause of a false negative reading.
- A two-to-three degree difference between a person's two eyes is ordinary.
What is canthal tilt, and what is actually being measured?
Canthal tilt is the angle of the line running from the inner corner of your eye to the outer corner. The two corners have anatomical names: the inner one is the medial canthus, the outer one is the lateral canthus. The tilt is simply how much higher the lateral sits than the medial, expressed in degrees.
The angle is not a matter of soft tissue. It is set by where the lateral canthal tendon anchors to the bone of the orbital rim. That is why it stays stable through weight change and through most of adult life, and why the list of things that genuinely alter it is very short.
How to measure canthal tilt on your own face
Hold a straight edge — a pen, the edge of a card — horizontally between your two inner corners, and look at where the outer corners fall relative to it. Above the line is positive, below is negative, level is neutral. That is the whole method, and it works.
What it does not give you is a number, and at the boundary the number is the only thing that settles it. A tilt of +1° and a tilt of −1° look identical in a mirror and are on opposite sides of the label.
There is one mistake that dominates all the others: measuring with your chin tipped down. Lowering the chin rotates the entire measurement and manufactures a negative tilt on a face that does not have one. Straight on, chin level, camera at eye height.
Positive, neutral and negative canthal tilt: where the cut points are
Above 0° is positive, and pronounced above roughly +5°. At or below 0° is negative. The narrow band around level is neutral. Most faces measure somewhere between +2° and +8°, which means a genuinely negative reading is a minority result rather than the norm the internet implies.
Because this is a continuous measurement rather than three kinds of eye, the labels are cut points on a scale. Someone at +0.5° and someone at −0.5° have essentially the same eyes and different labels.
What changes canthal tilt — and what does not
Two procedures move the angle itself. A canthopexy suspends the lateral canthal tendon higher without detaching it, giving a smaller change and a shorter recovery. A canthoplasty detaches and reattaches it higher on the orbital rim, giving a larger one. Both are surgical and both carry the ordinary risks of eyelid surgery.
Makeup, brow shaping and lash direction change how the angle reads without changing the angle. That is a real effect and worth knowing, and it is not the same thing.
Mewing does not change canthal tilt. Tongue posture does not act on the lateral canthal tendon, and no evidence supports the claim that it does. Neither do facial exercises or massage. And the practice of deliberate facial trauma that circulates in some looksmaxxing communities causes fractures and permanent asymmetry — it does not produce tilt, and it is not a grey area.
Canthal tilt and hunter eyes: one trait, not the whole thing
Positive canthal tilt is one of the components of what gets called hunter eyes, alongside a compact upper lid and an eye that sits deep under a projecting brow bone. A strong positive tilt on its own is not the same thing.
The hunter eyes page scores the components separately, including a plain statement of the one component a front-facing photo cannot measure.
Tips for an accurate canthal tilt measurement
- Chin level and camera at eye height. This matters more than everything else combined — a lowered chin is the single most common cause of a false negative reading.
- Look straight into the lens, not slightly above or below it.
- Relaxed brows and a neutral expression. Squinting pulls the outer corner.
- No glasses — frames and lens distortion both move the corner landmarks.
- Measure on two or three separate photos and take the middle value if you are near the boundary.
Canthal Tilt Test — frequently asked questions
What is a good canthal tilt?
There is no measured threshold that makes one 'good'. Most people fall between +2° and +8°, and preferences about the angle vary between cultures and change over decades. It is one measurement among many.
How accurate is this canthal tilt calculator?
The angle is computed from landmark positions, so it is precise to a fraction of a degree for the photo you gave it. Head tilt is the limiting factor, not the maths — a chin lowered by a few degrees moves the reading by roughly the same amount.
Why do my two eyes have different canthal tilts?
Because most faces are slightly asymmetric. A difference of two or three degrees between sides is ordinary. The test reports each eye rather than averaging the difference away.
Can canthal tilt change over time?
The tendon attachment is stable, but lower lid laxity increases with age and can flatten how the angle reads. A tilt that has changed noticeably over a short period is worth mentioning to a doctor.
Does mewing change canthal tilt?
No. The angle is set by a tendon anchored to the orbital rim, and tongue posture does not act on it. This claim is widespread online and unsupported.
Is canthal tilt the same as downturned eyes?
A negative canthal tilt and downturned eyes describe the same measurement — one term comes from looksmaxxing, the other from beauty writing.
References
- 1.Rhodes, G. (2006). The evolutionary psychology of facial beauty. Annual Review of Psychology, 57, 199–226.
- 2.Holland, E. (2008). Marquardt's Phi mask: pitfalls of relying on fashion models and the golden ratio to describe a beautiful face. Aesthetic Plastic Surgery, 32(2), 200–208.