Gonial Angle (Jaw Angle)
The gonial angle is the angle at the corner of the jaw, where the vertical ramus meets the horizontal mandibular body — measured in degrees.
Definition
The gonial angle (also called the angle of the mandible) is formed at the gonion — the bony corner where the vertical ramus of the mandible meets the horizontal body. Measured cephalometrically, the angle is typically reported in degrees, with 90° representing a perfect right angle and higher values representing a more obtuse, rounded jaw. Adult averages run 120°-130° in young men, 125°-135° in young women, with modest widening (more obtuse) over the lifespan. A sharper gonial angle (closer to 120°) reads as defined, masculine, and angular. A wider angle (above 145°) reads as soft, round, or older. The gonial angle is one of the single most studied jaw metrics in orthodontics and facial aesthetics.
Why it matters
Jawline definition is the single most common below-average metric in our looksmaxxing data, and the gonial angle is its primary driver. Sforza and colleagues (2011) found measurable differences in gonial angle between high- and low-attractiveness rated faces. Unlike many bone metrics, the gonial angle is partially modifiable: masseter hypertrophy from chewing or mastic gum, and body fat reduction along the jawline, can both produce a sharper-looking angle even when the bone itself is unchanged.
How AI measures it
AI detects the mandibular boundary from a front-facing or three-quarter photo, identifies the gonion (jaw corner), and computes the angle between the ramus line (gonion to ear) and the mandibular body line (gonion to chin). Reported in degrees. Side-profile photos give the most accurate measurement; front-facing photos use a 2D approximation that the AI corrects via head-pose estimation.
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Frequently asked questions
What is an ideal gonial angle?
For men, 120-130° is the elite range. For women, 125-135° is more typical and considered ideal. Above 145° reads as soft or rounded. Below 115° is rare and starts looking surgically sharp.
Does gonial angle change with age?
Yes. The angle widens roughly 1-2° per decade after age 30, due to bone remodeling and dental changes. Tooth loss accelerates the change significantly.
Can mastic gum sharpen the gonial angle?
Mastic gum builds masseter muscle, which adds bulk over the jaw corner and visually sharpens the angle. The bone itself doesn't change, but the perceived jawline definition often does.