Face symmetry test: your left side against your right, in numbers

Symmetry here means bilateral symmetry: how closely the left half of the face matches the right half reflected across the midline. The landmark mesh gives paired points for the eyes, the brows, the nose, the mouth and the jaw. For each pair, the left point is reflected across the fitted midline and the distance to its right-hand partner is measured. Dividing by face width makes the figure independent of how close you stood to the camera.

Raw deviation is then mapped to a 0-100 score through a curve calibrated per feature on measured faces, because the same millimetre of mismatch is far more visible at the eyes than along the jaw. Eye symmetry and jaw symmetry are shown on their own, as the two pairs people actually notice, and the overall score is a weighted combination of every pair.

• Overall high, jaw low. The most common pattern, and usually the photograph rather than the face: the jaw is the pair most affected by a small head turn. Check the pose grade first.
• Eyes lower than the rest. One eye sitting a little higher, or one brow arching more, is the single most frequent real asymmetry in the data. It is also the one that lighting exaggerates most.
• Everything moderate. The typical face. Human faces cluster tightly on symmetry, which is why the percentile line matters more than the raw score.
• Two photos, two scores. Expression, a slight tilt and hard side light each move the figure by several points. If the two disagree, the squarer, flatter-lit one is the better measurement.

• A single 2D photo cannot separate a genuinely asymmetric feature from a face that is slightly rotated toward the camera. The pose gate reduces this; it does not remove it.
• Shadow reads as shape. A face lit from one side scores lower than the same face under flat light, for no anatomical reason.
• Symmetry is a weak correlate of how people rate faces, not a measure of attractiveness. It is reported here as one component of a composite and nothing more.
• Nothing on this page will tell you to change your face. The measurement is the product.

The method page has the symmetry curve, the weights and the full list of limitations.

How does the face symmetry test work?

A face-landmark model runs in your browser and places 478 points on your face. A midline is fitted through the centre points - between the brows, down the nose, to the chin - and every paired feature on the left is reflected across it and compared with its partner on the right. The mismatch is measured as a percentage of face width, then mapped through a per-feature curve calibrated on measured faces to a 0-100 score. Eye symmetry and jaw symmetry are reported on their own as well as inside the overall figure.

What is a good face symmetry score?

The result shows where your overall symmetry sits against 7,997 previously measured scans as an "ahead of N%" figure, so you read your own standing rather than a generic threshold. That figure is only attached from the 55th percentile upward and is capped at 99%. Two things worth knowing before you read it: no real face is perfectly symmetric, and left-right differences of a few percent of face width are the norm, not the exception.

Why is my face not symmetrical?

Because nobody's is. The two sides of a face grow semi-independently, and habits accumulate on top - chewing on one side, sleeping on one side, a habitual expression, a dominant eye. The result is that eyes sit at slightly different heights, one brow arches higher, and the mouth pulls to one corner. This is ordinary, it is invisible in conversation, and a symmetry test is the first time most people ever see it quantified.

Does head angle affect the face symmetry test?

More than anything else. Turning the head even ten degrees foreshortens one side of the face, which the mirror comparison reads as genuine asymmetry. That is why the result grades your head pose and warns you when it is off. If your jaw symmetry is low and the pose grade is anything but good, retake the photo square to the camera before reading anything into the number.

Is facial symmetry the same as attractiveness?

No. Symmetry does correlate with how people rate faces, which is why almost every face-scoring tool leans on it, but the effect in published research is modest and many highly rated faces are visibly asymmetric. On this site symmetry is one of four components in the composite score, carrying 35% of the weight - the largest share, but nowhere near the whole story.

Does the face symmetry test upload my photo?

The free test never uploads your photo. The landmark model is downloaded to your browser and run there; no request carries the image, and there is no account or email step. The only flow on this site where a photo leaves the browser is buying the optional full report, which asks for explicit consent first.

• The full facial attractiveness test, all six components
• Golden ratio face test: the proportion component, measured alone
• Facial harmony: how symmetry combines with thirds and fifths
• What each band on the 1-10 scale means