Canthal tilt shows up constantly in the fox-eye / hunter-eye makeup trend, always as a vibe rather than a number: "positive tilt" or "negative tilt," decided by eyeballing (no pun intended) a photo. I wanted the actual angle, in degrees, because "positive" covers everything from barely-there to pretty dramatic and I had no idea which end of that range I was on.
The annoying part of measuring it yourself: you need the two eye corners in a photo where your head isn't tilted, and any head tilt gets read as eye tilt if you don't correct for it. I tried eyeballing it on a screenshot with a protractor app and gave up. That's not a measurement, that's a guess with extra steps.
I used measureface.com's canthal tilt test, which runs face landmark detection in the browser, finds the actual eye-corner points (inner and outer corner, each eye separately), and corrects for head rotation before giving you the angle. It gives each eye its own number instead of averaging them, which turned out to matter. Mine came back +3° and +6°, close enough to each other that I wouldn't have noticed the difference by eye, but genuinely two different numbers.
Worth saying plainly: neither of those numbers is "good" or "bad." The tool doesn't score it that way, which I appreciated, because the fox-eye trend treats a bigger positive number as better, and that's a style preference, not a fact about a face. What I actually wanted was just to know the number instead of guessing at a label.
One accuracy note the tool itself flags: it tells you how precisely it could resolve the angle before giving you the number, so a blurry or off-angle photo gets a wider margin instead of a falsely confident figure. Worth using a straight-on, evenly lit photo if you want the tightest reading.
If you've seen "canthal tilt" thrown around online and never had an actual measurement to attach to it, this is a five-minute way to get one.
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