FaceSymAI

Face Symmetry Test / Facial symmetry

What is facial symmetry?

Facial symmetry is how closely the left and right halves of a face match. No real face matches exactly, so what matters is how big the differences are and where they sit. You can measure your own face symmetry with one photo.

What makes a face symmetrical?

Picture a vertical line from the middle of the forehead to the chin. A symmetrical face has matching features on both sides of that line, at the same height and the same distance from it. These are the seven pairs our test measures:

  • Eyes: are they level, and equally far from the line?
  • Eyebrows: do they sit at the same height with a similar arch?
  • Ears: are they set at the same distance from the centre?
  • Nose: does the bridge follow the line or lean to one side?
  • Mouth: are both corners at the same height?
  • Upper and lower cheeks: is the face equally wide on each side at cheekbone and jaw height?

Is a perfectly symmetrical face real?

No. Small random differences between the two sides are found in almost everyone. Researchers call them fluctuating asymmetry. The two halves of your face are close relatives, not copies.

You can see this for yourself. Take a straight-on photo, build one face from the left half and a second from the right half, and put the three side by side. The two built faces usually look like two different, believable people. Our home page shows exactly this with one example face.

Does symmetry make a face attractive?

A little, on average. Studies in which people rate faces tend to find that more symmetrical faces score slightly higher. The effect is modest, and it is one signal among many. Skin, expression, grooming, and how familiar a face is all matter at least as much. Faces that software forces to perfect symmetry often look strange, because the small differences are part of what makes a face look like a person.

Why one side can look different

Part of what you see is the face, and part is the picture. Before you read anything into a gap between your two sides, rule out the picture:

  • Head tilt or turn. A small turn makes one half look narrower.
  • Light from one side. It deepens shadows on that half and moves where features seem to be.
  • Expression. Most smiles lift more on one side.
  • Hair, glasses, hats. Anything that covers one side changes what is measured there.
  • Camera distance. A phone held close and low stretches the lower face.

Real differences also exist. Teeth and jaw, old injuries, ageing and genetics can all leave one side a little different from the other.

When an uneven face is a medical matter

Gradual, lifelong differences are normal. A sudden change is not. If one side of your face droops or goes numb, or your smile turns uneven without warning, get urgent medical help. These can be signs of a stroke or a nerve problem. A symmetry test is not a medical tool and cannot tell the two apart.

How to check your own facial symmetry

  1. Face a window or a lamp, so the light is even on both sides.
  2. Hold the phone at eye level, head level, eyes on the lens, with a relaxed face.
  3. Push hair back and take off glasses and hats.
  4. Upload the photo to the face symmetry test. It places 68 landmarks, draws the midline and scores each of the seven pairs. The overall number is their average.
  5. Try a second photo. The two scores will differ by a few points, and that gap shows you how much comes from the shot and how much from your face.

Not sure what your number means? The score bands on the home page explain each range. The photo is measured in memory and never stored.

Measure my face symmetry

Questions about facial symmetry

What is facial symmetry?
Facial symmetry is how closely the left and right halves of a face match in shape, size and position. A fully symmetrical face would look the same if you folded it down the middle. No real face does, so the useful question is how much the two sides differ.
Is it normal for my face to be asymmetrical?
Yes. Small differences between the left and right side are found in nearly everyone. One eye sitting a little higher, a smile that lifts more on one side or a nose that leans slightly are all ordinary.
Does a symmetrical face look more attractive?
On average, studies find that more symmetrical faces are rated slightly more attractive, but symmetry is one signal among many. Skin, expression, grooming and how familiar a face feels all matter, and faces that are made perfectly symmetrical by software often look odd.
How can I check if my face is symmetrical?
Take a straight-on photo in even light and measure it. Our free test finds 68 landmarks, draws a midline through your face and scores seven feature pairs from left to right. You can also split a photo down the middle and mirror each half to see how different the two versions look.
Can facial symmetry change over time?
Yes. Ageing, weight change, dental work, injuries and changes to the jaw can all shift the balance between the two sides. Hair, glasses and make-up change how symmetrical a face looks without changing the face itself.
Why does my face look different in a mirror and in a photo?
A mirror and a selfie preview show you flipped. Other people see you the way a normal photo does. Because everyone has small differences between sides, the flipped version can look unfamiliar even though both are accurate.
When should I see a doctor about an uneven face?
If one side of your face droops or goes numb suddenly, or your smile becomes uneven without warning, get urgent medical help. That can be a sign of a stroke or nerve problem. Lifelong, gradual differences are normal and are not what a symmetry test is looking for.