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Canthal Tilt Calculator: Measure Your Eye Angle
Upload a front-facing photo and this free canthal tilt calculator measures the angle from the inner to the outer corner of each eye. See both angles, their average, the left–right difference and a positive, neutral or negative reading, drawn on your photo: a canthal tilt test in seconds.
- Both eyes measured
- Head tilt corrected
- Photo stays on your device
- Results in seconds
Drop a front-facing photo
JPG, PNG, WebP or HEIC up to 30 MB. One face, straight on, even light.
Runs in your browser. The photo is not uploaded.
How it works
How to Measure Canthal Tilt With This Calculator
By hand, you would draw a line through the corners of one eye and measure its slope. The canthal tilt calculator does the same from one photo, for both eyes, and levels your head first.
Upload a Front-Facing Photo
Drop in a selfie, paste one or use your camera. JPG, PNG, WebP and HEIC all work, and a quality check asks for another photo when the face is blurred, turned or too small.
Corners Found, Head Levelled
A face model places 478 facial landmarks on the photo, in your browser. The calculator takes the two corners of each eye and fits a level line to your face, so a leaning head does not skew the angle.
Your Angles, Drawn on the Photo
You see the average tilt in degrees with a positive, neutral or negative label, then each eye and the difference between them. Tap a reading to draw its line on a close-up of your eyes.
What it measures
What the Canthal Tilt Calculator Measures
One angle per eye, read the same way on both sides, plus the numbers built from the pair. Each comes from two points per eye, so you can check it against your photo.
Tilt of Each Eye
The angle of the line from the inner corner (the medial canthus) to the outer corner (the lateral canthus). It is positive when the outer corner sits higher.
Average Tilt
The mean of your two eyes, to one decimal place with a plus or minus sign. It is the headline number and the one that sets your positive, neutral or negative label.
Left–Right Difference
The gap between your two angles. Under 3° reads as even. Above that, a note suggests retaking the photo straight on, since a slight head turn is a common cause.
Your Face's Own Horizontal
Angles are measured against a level line fitted to your face, not the edge of the photo. Lean your head sideways and the reading stays the same.
Corner Landmarks
Two points per eye, picked from 478 facial landmarks placed in your browser. The eye angle depends on them alone, so clear, sharp corners matter more than anything else.
Eye Spacing and Symmetry
Eye spacing, pupil distance and the symmetry of your eyes and brows come from the same photo. The calculator shows them locked, and the full report opens them.
Canthal tilt meaning
Positive vs Negative Canthal Tilt: What Each Means
Your average angle falls into one of three bands around a level line. The cut-offs are this tool's own convention for describing a slope, not a clinical norm, and no band is the one to aim for.
< −2°
Negative Canthal Tilt
The outer corners sit lower than the inner corners, a slope often called downturned eyes. It tends to read as soft, and a camera held too low can push a level eye into this band.
±2°
Neutral Canthal Tilt
The inner and outer corners sit at about the same height, so the eye line runs close to level. Near the band's edges, a small change in camera height can tip a reading over.
> +2°
Positive Canthal Tilt
The outer corners sit higher than the inner corners, a slope often called upturned eyes. A lowered chin or a camera above eye level exaggerates it, so check the photo before trusting a steep angle.
What do the signs mean? A plus sign means the outer corner is higher, a minus sign that it is lower. The label follows the average, so one eye can sit in a different band from the other.
Accuracy and limits
How Accurate Is a Canthal Tilt Test?
A canthal tilt calculator is accurate at one job: reading the slope between two eye corners in your photo, the same way every time. The photo itself moves the angle more than most people expect.
Same Photo, Same Angle
What it measures well
The same photo always returns the same angles. No language model gives an opinion, so nothing flatters you or drifts between runs.
What it can't tell you
One fixed number across different photos. Small shifts between two careful pictures are ordinary, and they matter most near the edge of a band.
Head Tilt and Camera Height
What it measures well
A head leaning to one side is corrected, because the angle is read against your face's own horizontal and not the frame of the photo.
What it can't tell you
A camera above or below your eyes is not corrected. Shot from above, the outer corners look higher; from below, lower. A flat photo cannot undo that.
Corners and Eyelids
What it measures well
The inner and outer corner of each eye, located from 478 landmarks on your own device.
What it can't tell you
Hooded lids, heavy lashes, a liner wing or glasses can hide a corner, and eyelid shape, which changes how a tilt looks, is not part of the number.
What the Angle Means
What it measures well
A plain geometric fact about one photo: how steeply the line through each eye rises or falls toward the temple.
What it can't tell you
Whether your eyes are attractive, or anything medical. Taste varies between people and cultures, and this canthal tilt measure is not a clinical exam.
Camera height moves this reading more than anything else, so shoot at eye level before comparing two results.
Photo tips
Photo Tips for a Reading You Can Trust
The canthal tilt calculator measures the photo, so the photo decides the angle. Six habits keep the eye corners clear and the camera honest, and make two readings fair to compare.
Camera at Eye Level
Hold the phone level with your eyes, an arm and a half away. Held higher, it makes the tilt look more positive; held lower, more negative.
Face the Lens Squarely
Keep your nose centred and both ears equally visible. A turned head shortens one eye in the picture, and the two angles drift apart.
Soft Light From the Front
Face a window. Overhead light fills the eye sockets with shadow, and the corners the calculator needs are the first things to disappear.
Neutral Face, Eyes Relaxed
Smiling lifts the cheeks and narrows the eyes, and squinting or raised brows move the lids. Keep your mouth closed and look straight into the lens.
Glasses Off, Hair Back
Frames, a fringe or loose hair can cover the outer corners. Take your glasses off and keep hair clear of your brows and temples.
Sharp, With No Filters
The corners are small points, so blur affects this reading more than most. Rest the phone or use a timer, and turn off beauty mode.
Changing the look
Can You Change Your Canthal Tilt?
People search for how to fix canthal tilt or how to get positive canthal tilt, but there is nothing to fix. The angle comes from bone and eyelid structure, and no exercise is known to move it. You can change how it reads.
Start With the Photo
A low camera or a lifted chin is enough to push a reading negative. Retake the picture at eye level before you decide what your tilt is.
Liner, Lashes and Brows
A short upward flick of liner at the outer corner, fuller lashes on the outer third and a brow tail that does not dip all make the eye line read as lifted.
Frames That Sweep Upward
Glasses whose outer edges rise, such as a soft cat-eye, echo an upward line. Frames that droop at the outer edge do the opposite.
Let Your Expression Help
A relaxed smile lifts the cheeks and the outer corners with them. In everyday pictures, that flatters more than the neutral face the calculator asks for.
What Time Changes
Eyelids loosen with age and the outer corners can settle a little lower. Surgery that moves them exists, but that is a medical decision for a qualified surgeon, not for a calculator.
Retest the Same Way
Use the same spot, light and distance each time. Then a change in the angle reflects your face and not the camera.
Your privacy
Your Photo Never Leaves Your Device
This canthal tilt calculator works inside your browser. Your photo is measured on your own phone or computer, so it is never uploaded, stored or used to train a model.
Measured on Your Device
The face model downloads to your browser and runs there. Your photo stays on your phone or computer throughout.
No Sign-Up
The free tool needs no account, no email and no payment. Close the tab and the photo is gone.
Never Used for Training
A photo that is never uploaded cannot be kept or used to train a model. The same goes for every free FaceStats tool.
Uploaded Only for the Full Report
The optional full report uses AI processing in the cloud. Your photo is uploaded only after you choose to buy it and agree, and you can delete it afterwards.
Full Report for Adults
The paid report is for people aged 18 and over using a photo of themselves. The free calculator asks for no personal details.
Your Card, Your Choice
The result card is drawn in your browser too. You decide whether it shows your photo before you save or share it.
Common questions
Canthal Tilt Calculator FAQ
Short answers on what the angle is, how it is measured and what a result can and cannot tell you about your eyes.
More tools
More Free Face Tools
Each one looks closely at one part of your face, such as its shape, its symmetry or your midface, free and in your browser.
Measure Your Canthal Tilt in Seconds
Upload one photo and the canthal tilt calculator shows both eye angles, the average and the difference, drawn on your own eyes. Free and private, with no sign-up.