Jawline Rating Test

Four numbers come out of your photo. The first is bigonial width against bizygomatic width — the distance between your two jaw corners divided by the distance across the widest part of your face. This is a standard anthropometric ratio and the single most useful thing a front photo gives you about a jaw, because both endpoints sit on the same plane as the camera.

The second is the taper: your chin width divided by your jaw width, which separates a V-shaped lower face from a square one. The third is asymmetry, the difference between how far each jaw corner sits from your facial midline. The fourth is the jaw angle as it projects onto the front plane — useful, comparable between your own photos, and not the same thing as a gonial angle. The rating combines the angle and the width ratio, weighted toward the angle, because visible corner definition is what people mean when they say a jaw is sharp.

Bigonial width divided by bizygomatic width is the number worth reading, and it needs no depth. It describes whether your jaw carries the width of your face down past the cheekbones or falls away beneath them. Values around 0.78 to 0.92 read as a jaw that follows through; below that the lower face narrows sharply, and above it the jaw is as wide as the cheekbones and the corner stops reading as a corner at all.

This is also the number that changes with the procedures people search for. Masseter botox reduces the muscle bulk at the jaw corner and lowers the ratio. Jaw or chin filler raises it, as does a genioplasty at the front. Nothing about the ratio is a verdict — wide, average and narrow jaws are all common and all normal — but it is the measurement a consultation will start from, and having your own number before you walk in is worth more than a rating out of ten.

The answers divide cleanly into three, and confusing them is why the advice online contradicts itself. Body composition is the largest lever for most people: subcutaneous fat over the jaw and in the submental area sits directly on the line you are trying to see, and it responds to the ordinary things. Muscle is the second: the masseter can be reduced with botox or enlarged by clenching, and which direction you want depends on whether your ratio reads wide or narrow.

Bone is the third and only surgery moves it — genioplasty, jaw reduction at the angle, or orthognathic surgery when the bite is involved. Chewing gum, jaw exercisers and facial massage are sold as the second category and marketed in the language of the third — and in a six-month randomised trial, chewing gum three times a day raised bite force but did not change masseter thickness or jaw shape. If your measurement reads narrow, adding definition is a matter of adding structure rather than removing anything, which is the opposite of what most jawline advice assumes.