What is jawline definition?

Jawline definition is not one number but a set of related measurements: contour sharpness along the jaw edge, bigonial width, the ratio between jaw width and cheekbone width, and the degree of left to right symmetry across the jaw.

How Facemap measures jawline definition

The mesh traces a chain of landmarks along the jaw border from ear to chin on each side. Contour sharpness comes from how tightly this line turns at the jaw angle rather than curving gradually. Bigonial width is the straight-line distance between the two jaw angle points. The jaw-to-cheek ratio divides bigonial width by cheekbone width from the same frame. Symmetry compares the left contour to a mirrored right contour around the facial midline.

What the typical range looks like

There is no universal target, since jaw structure varies widely and is strongly influenced by bone shape, muscle mass and soft tissue thickness. A narrower jaw-to-cheek ratio tends to read as a tapered, heart-shaped lower face, while a ratio closer to one reads as a squarer lower face. Sharper contour scores generally correspond to a more visually defined jaw edge under any lighting.

How to read your result

Read bigonial width and the jaw-to-cheek ratio together with your face shape result, since the same jaw width reads differently depending on cheekbone width and facial thirds proportions. A meaningful symmetry gap is worth checking against your overall facial symmetry score to see if it is isolated to the jaw.

The jawline definition formula: how we calculate it

Bigonial width against bizygomatic width, the cheek-to-jaw taper. Landmark numbers are MediaPipe Face Landmarker indices, and every distance is normalised to your own face so camera distance and image size cancel out.

dist(172, 397) / dist(234, 454)

Landmarks used

172, 397, 234, 454

Reference target

0.72

Tolerance band

0.15

Your reading is compared with that published reference on a Gaussian match curve: score = round( 100 x exp( -0.5 x ( (reading - target) / tolerance )^2 ) ), clamped to 1 to 99. Basis for the reference value: taper ratios associated with a defined but not square lower face. The headline Attractiveness Score works differently: all readings are corrected for head angle and expression, weighted by confidence and mapped onto a 1 to 100 scale by a model calibrated against a published research set of more than Facemap scans.

Read the full Facemap methodology, including how the 22 measurement categories combine into your Attractiveness Score.

Jawline definition reference table

Jaw-to-cheek width ratio bands and how each one reads.

• Above 0.95Wide

  Jaw width close to or exceeding cheekbone width

• 0.85 to 0.95Balanced

  The most commonly measured band

• 0.75 to 0.84Tapered

  Jaw notably narrower than cheekbones

• Below 0.75Narrow

  Pronounced taper toward the chin

What makes a jawline read as defined?

Contour sharpness, not width alone, drives how defined a jawline appears. Several structural and soft tissue factors combine to produce it.

• /Bone angle at the gonial region, covered in more depth by gonial angle
• /Thickness of the soft tissue and fat layer over the jaw
• /Muscle tone in the masseter, which sits at the jaw angle
• /Skin laxity, which softens contour with age
• /Head position during capture, corrected by the landmark model

Bigonial width and facial proportion

Bigonial width, the distance between the two jaw angle points, is a standalone structural measurement that also feeds directly into the jaw-to-cheek ratio and interacts with facial thirds. A wide bigonial width paired with a narrow upper face tends to read as a strong lower third, while the same width against wide cheekbones reads as balanced.

Jaw symmetry versus jaw definition

A jaw can be sharply defined on both sides yet still asymmetric, or softly contoured yet perfectly even, so these are reported as separate figures rather than blended into one score. Facemap compares the left and right jaw contour independently of sharpness or width, which keeps the source of any difference clear.

The jawline definition formula, step by step

The jawline calculator does not reduce your jaw to a single width number. It weighs gonion to gonion width against the sharpness of the gonion to menton contour to produce a definition index.

• /Measure bigonial width, the straight-line distance between the left and right gonion points
• /Trace the contour from each gonion to the menton, the chin point, on both sides
• /Score how sharply that contour turns at the gonion rather than curving gradually
• /Weigh the bigonial width against the contour sharpness score
• /Combine both into a single jawline definition index