Facial symmetry
How closely the left and right halves of your face mirror each other.
Why it matters
Symmetry is one of the core tenets of facial attractiveness, linked to perceived genetic health.
What facial symmetry measures here
This metric estimates how closely the left and right halves of your face mirror each other. The tool takes matched landmark pairs, the two eye corners, the two mouth corners, the sides of the nose and jaw, and so on, reflects them across the vertical midline of the face, and scores how well each pair lines up. A reading of 100 percent would mean a perfect mirror.
It is reported as a percentage rather than a ratio, and faces measured on this scale cluster very high, around 98.5 percent, because gross asymmetry is rare. The band treated as highly symmetric runs from about 98.2 to 100 percent. Rhodes et al. 1998 and Grammer and Thornhill 1994 are the references behind this measure.
Why symmetry is studied
Symmetry is one of the most-discussed cues in the science of facial attractiveness. Rhodes et al. 1998 examined symmetry and the perception of beauty, and Grammer and Thornhill 1994 studied symmetry together with averageness in the context of sexual selection, with the long-standing hypothesis that symmetry may signal developmental stability.
The honest framing matters. The link between symmetry and attractiveness is real but modest in the literature, not absolute. Perfectly symmetric faces are vanishingly rare, mild asymmetry is the norm, and faces built by perfectly mirroring one half can look slightly off rather than more beautiful. Symmetry is one contributing cue among many, not the whole story.
The score and its caveats
Because real faces sit so close to fully symmetric, the percentage here is best read as a relative heuristic rather than a clinical measurement. Small differences near the top of the scale are not very meaningful, and the existing guidance is candid that on a standardized studio set this metric barely separates faces. A value inside the band simply means your landmark pairs mirror closely; a lower value points to a visible difference, often at the nose, jaw or eye level.
The biggest caveat is measurement noise. Symmetry scores are extremely sensitive to head rotation, lighting that falls unevenly across the face, and expression, all of which can manufacture asymmetry that is not really there.
Reading your value and what is changeable
Before reading anything into a lower score, rule out the photo. A head turned even slightly, a tilt, side lighting, or an asymmetric expression like a one-sided smile will all lower the number. A straight, front-on, evenly lit and relaxed photo gives the only fair reading, and is itself the simplest, fully reversible lever.
Genuine asymmetry is mostly fixed structure and is near-universal at some level, so the realistic levers are about presentation: posing, lighting and a relaxed expression. Some people pursue noninvasive options such as balancing filler or Botox to even out a modest asymmetry; these are temporary cosmetic procedures with cost and risk, mentioned only as information. The most useful takeaway is that small asymmetry is normal and says nothing about a person.
Typical range
~100% (perfectly mirrored)
How closely paired left/right landmarks mirror across the facial midline. 100% = perfectly symmetric.
What your reading means
- Typical
- Your face is highly symmetric.
- Less common
- Your face is fairly symmetric, with minor differences.
- Distinctive
- There is a visible left-right asymmetry (often nose, jaw or eye-level).
How we measured it
We mirror matched landmark pairs across your facial midline and score how well they align (100% = perfect mirror).
The evidence
Symmetry correlates modestly with attractiveness in the literature (Rhodes 1998), though our standardized studio set barely separates on it. The percentage is a relative heuristic, not a clinical measure.
References
- Rhodes, G., Proffitt, F., Grady, J. M., & Sumich, A. (1998). Facial symmetry and the perception of beauty. Psychonomic Bulletin & Review, 5(4), 659-669.
- Grammer, K., & Thornhill, R. (1994). Human (Homo sapiens) facial attractiveness and sexual selection: the role of symmetry and averageness. Journal of Comparative Psychology, 108(3), 233-242.