Harmony & facial ratios
Jaw Frontal Angle
1 min read · Updated October 4, 2026
The angle between the two sides of the lower jaw as they come together at the chin.
What it is
The jaw frontal angle (JFA) describes the shape of the lower face from the front. It is the angle between the left and right jawlines if you extend them until they meet below the chin.
How it's measured
Each jawline runs from the jaw corner to the side of the chin. The angle where the two lines would meet is calculated from landmarks. A smaller angle means a more tapered, V-shaped lower face, and a larger angle a broader, squarer one.
How it's read
A squarer lower face generally reads as stronger and a more tapered one as softer. Ranges are set separately for men and women, and the angle is also read together with the ipsilateral alar angle.
What affects it
Beards and shadows under the jaw hide the jawline, and a raised chin changes the angle. Use a neutral head position and even light.
Related measurements
In the same group: Deviation of IAA & JFA, Facial Symmetry and Jaw Slope. The full list is on the Harmony overview.
See it on a full report
Open the sample report to see every measurement, score and highlight on a real example.