Facial Symmetry Test: How Symmetrical Is Your Face?

You can't judge it in the mirror — your brain normalizes the face it sees every day, and the mirror shows you a flipped version you've learned to accept. The mirror-flip apps that overlay two left halves or two right halves exaggerate in the other direction: nobody looks normal as a composite of one duplicated half, so those images always read as more asymmetrical than the real face.

The reliable way to check is measurement: a front-on photo, even lighting at eye level, and a landmark comparison of matched left-right pairs — jaw contour, eye and brow centers, mouth corners — against the facial midline. That's what this test does: it compares 11 mirrored pairs and gives you one symmetry reading, instead of leaving you squinting at a flipped selfie.

What percentage of facial symmetry is normal?

There is no research-backed percentage cutoff that separates a "symmetrical" face from an "asymmetrical" one — treat any site that promises one with suspicion. What the research does show is that measurable left-right differences are universal (Grammer & Thornhill 1994; Rhodes 2006): a 100 on any 0–100 symmetry index doesn't occur in real faces. In practice, most of the variation between your own photos comes from lighting direction and head angle, not bone. So read your score as a comparison — against your other photos and against other RealSmile scanners, where 50 is the median — rather than as a pass/fail grade.