Harmony & facial ratios
Jaw & symmetry: the six measurements
7 min read · Updated November 1, 2026
Six measurements describe the lower-face outline and how closely the two sides match: jaw slope, jaw width, the angle of the jaw, how that angle agrees with the nose angle, neck width, and overall symmetry.
How these fit together
These measure the outline of the face, which is exactly what facial hair, a double chin or a lowered head blurs, so the landmark can land on the soft tissue instead of the bone. Keep your head level and chin neutral. Symmetry is the most photo-sensitive row on the page: a turned head, a tilted camera or uneven light adds apparent asymmetry that isn't in your face.
Jaw Slope
How steeply the lower jawline runs from the jaw corner to the chin.
What it is
Jaw slope is the angle of the lower jawline as it runs from the corner of the jaw (the gonion) to the point of the chin (the menton). It describes whether the jaw runs flat and horizontal or slants steeply toward the chin.
How it's measured
The angle of the jawline against the horizontal is taken on each side and averaged. The app reports 180° minus that angle, so a higher number means a flatter, more horizontal jawline and a lower number a steeper one.
Definition: the angle of the jawline against the horizontal, from each jaw corner to the chin point, averaged over both sides and expressed as 180° minus that slope.
How it's read
A flatter jawline reads as wider and more angular, and a steeper one as more tapered. Ranges are set separately for men and women.
What affects it
Posture, a raised chin and double-chin tissue all change the visible jawline. Keep your head level and chin neutral. Leanness sharpens how defined the jaw looks, which is graded separately under Jaw Definition.
Bigonial Width
The width across the corners of the jaw as a percentage of cheekbone width.
What it is
Bigonial width compares how wide the jaw is, measured between the two jaw corners, with how wide the cheekbones are. It describes how strongly the face tapers from cheeks to jaw.
How it's measured
The distance between the two jaw-corner points is divided by cheekbone width and multiplied by 100.
Definition: the distance between the two jaw corners, divided by cheekbone width, × 100.
How it's read
A wider jaw relative to the cheeks gives a stronger, squarer lower face, and the male range sits higher. A narrower jaw relative to the cheeks gives a more tapered, softer lower face, and the female range sits lower.
What affects it
Landmarks on the jaw are easily affected by facial hair, shadows and beards, which can hide the jaw outline. Shave or trim and use even light for the cleanest reading.
Jaw Frontal Angle
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.
Definition: the angle, in degrees, at which the two lower jawlines would meet below the chin, each running from a jaw corner to the side of the chin.
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.
Deviation of IAA & JFA
The gap between your ipsilateral alar angle and your jaw frontal angle.
What it is
This is a consistency check. It compares the angle the nose and eyes make with the angle the jaw makes. The idea is that in a harmonious face the middle and lower face taper to a similar degree, so the two angles should be close.
How it's measured
It is the absolute difference, in degrees, between the ipsilateral alar angle and the jaw frontal angle. A smaller deviation means the two angles agree.
Definition: the absolute difference, in degrees, between the ipsilateral alar angle and the jaw frontal angle.
How it's read
A small gap is read as a smooth, continuous taper from the midface down to the chin. A larger gap is a descriptive sign that the lower face tapers differently from the upper. The tolerance is wide on purpose, since the two angles are taken from different parts of the face.
What affects it
Because it combines two angles, any head tilt or expression shift counts twice. A level, relaxed, front-on photo keeps the deviation honest.
Neck Width
The width of your neck just below the jaw, as a percentage of the width across the jaw corners.
What it is
Neck width compares how wide the neck is with how wide the jaw is above it. A figure near 100% means the neck is about as wide as the jaw, and a lower figure means the jaw stands clearly wider than the neck.
How it's measured
The face landmarks have no points on the neck, so a second on-device model labels the skin, hair and clothes in the photo. The neck's two edges are read at its top, on the first rows below the jaw where it shows, because a collar rarely covers that part. That width is divided by the width across the jaw corners and multiplied by 100.
Definition: the width of the neck at its top, just below the jaw, divided by the width across the jaw corners, × 100.
How it's read
A thicker neck reads as stronger and is the more masculine norm, so the male range sits clearly higher. A slimmer neck is the more feminine norm. A neck far wider or narrower than its range can make the jaw look lost or the head look large.
What affects it
This row only appears when the neck's edges can be read, so long hair over the neck, a high collar or a jacket up to the jaw can remove it. A lowered chin hides the top of the neck. Keep your head level and your neck clear.
Facial Symmetry
How closely the left and right sides of your face mirror each other.
What it is
No face is perfectly symmetrical, and small differences are completely normal. Facial symmetry measures how far the two sides drift apart, as a percentage of face width, where 0% would be a perfect mirror.
How it's measured
Pairs of matching landmarks (eye corners, brows, nostrils, mouth corners, cheeks and jaw corners) are mirrored across the face's midline, and the average distance between each mirrored point and its partner is divided by cheekbone width. Lower means more symmetrical.
Definition: eight pairs of matching left and right points (eye corners and tops, brows, nostril wings, mouth corners, cheeks, jaw corners) are mirrored across the midline; the average gap between each mirrored point and its partner is divided by cheekbone width, × 100.
How it's read
Differences of a percent or two are typical and barely visible. Larger gaps are noticeable. Symmetry is associated with higher perceived attractiveness in many studies, though the effect is modest, which is why it counts in the overall score without dominating it.
What affects it
Much of the asymmetry in a photo comes from the photo, not the face: a turned head, a tilted camera, uneven lighting or a lopsided expression all add apparent asymmetry. Face the camera squarely. The Features pillar also breaks symmetry down by region.
See it on a full report
Open the sample report to see every measurement, score and highlight on a real example.