AI Jawline Analysis & Lower-Third Ratio Test
Measure your lower-third mandibular width relative to cheekbone width (bigonial-to-bizygomatic proxy) and check chin midline alignment locally in your browser.
Zero server uploads · 100% private478 KEYPOINTS
Upload Your Front-Facing Photo
Drop a portrait here or tap below. We map 478 facial keypoints and overlay your geometric mesh directly in your browser.
4-Pillar Facial Proportion Breakdown
Midline pair alignment (30%)
fLWR 1.59 vs. Phi (30%)
26.4% fifths · +4° tilt (20%)
76.7% jaw-to-cheek ratio (20%)
Neoclassical & Phi (1.618) Reference Intervals0–100 Index
How Jawline-to-Cheekbone Proportion Is Evaluated
In front-facing 2D anthropometry, lower-face balance is assessed by comparing lower-third contour width against bizygomatic (cheekbone) width:
Balanced Taper
A lower-third width measuring roughly 75% of bizygomatic width provides clean structural definition without making the lower face appear overly narrow or boxy.
Heart / V-Taper
Indicates prominent cheekbones tapering to a narrower chin point. Common in heart and oval facial silhouettes; sensitive to downward head pitch.
Square / Broad Mandible
Reflects strong gonion width relative to the zygomatic arch, characteristic of square facial structures.
Disclaimer: Geometric landmark ratios measure 2D photographic proportions for educational and styling reference only and do not constitute medical, orthodontic, or surgical advice.
Check Your Upper-Third & Eye Axis Next
Combine your jawline score with our Canthal Tilt Calculator for a complete upper- and lower-face profile.