AI measures your gonial angle in degrees and scores your jawline definition. See exactly where you stand — and what to do about it.
17 metrics · NIH-cited landmarks · 100% private · Photos never uploaded
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Sharp, defined jawline angle in the top ~10% of the population. Associated with strong masculine facial structure and the highest attractiveness ratings for jaw definition. Typical of fitness models and professional athletes at low body fat.
Clearly defined jaw angle that reads as sharp and masculine. Still well above average and rates highly in attractiveness research. Achievable for most people at 13-16% body fat.
The most common range. A functional jawline that doesn't read as either sharp or soft. Typical for men at 17-22% body fat. Moving to the above-average range is achievable through fat loss for most people.
Softer jaw angle that creates a rounder facial profile. Often caused by facial fat accumulation over the jaw. Typically the first range where fat loss produces immediately visible jaw improvement.
Very soft jaw profile. Usually a combination of high body fat and underlying bone structure. Significant fat loss (to 13% or below) typically improves the apparent angle substantially even if the bone angle is wider.
Women's ideal gonial angle range is 125-135° — slightly wider than men's optimal range due to differences in desired facial structure perception.
Use these reference profiles to calibrate your reading. Each silhouette shows where the gonial angle vertex sits and how it reads at the named degree.
Defined gonial angle
Population median
Softer gonial angle
Your actual angle is measured from your uploaded photo using the bigonial line and the mandibular ramus. Most adult males fall 115°–125°; the “sharp” end of that range reads as more masculine in perception studies (Geniole 2015, PMID 26181579).
Schematic silhouettes — not real measurements. Actual gonial-angle math runs on your photo, not on these references.
The same person can read 17° apart depending on lighting, head tilt, and framing. Your bone structure doesn't change between photos — but the angle the camera captures does. Most jaw-score tools hide this. We don't.
What went wrong
What was fixed
The 17° swing is real — and it's not your bone
Both silhouettes show the same underlying mandible. Gonial-angle measurements from photographs vary with head pose, lighting direction, and framing — Sforza 2017 reported significant inter-photo variance even in controlled studies. A 5–10° swing from photo conditions alone is normal; a 15–20° swing under poor conditions is documented.
Your bone structure doesn't change. Your photo does. Retake with these conditions and re-score.
Schematic reference — your actual gonial angle is computed from your photo's landmarks, not these illustrations.
Jawline measurement uses landmark detection — identifying precise coordinates of 68 facial points, then computing angles from the mandibular boundary landmarks. The primary metric is the gonial angle. Here's the process:
The AI identifies the mandibular outline — the visible edge of the jawbone from chin point through the jaw angle to where it meets the ear. On a front-facing photo, this traces the lower jaw shape.
The gonial angle is the angle at the "corner" of the jaw — where the vertical ramus meets the horizontal body of the mandible. AI computes this as the angle between the ramus line and mandibular line extended.
Beyond the angle, the AI scores jawline definition by measuring contrast along the jaw border — how sharply the jaw boundary transitions from face to neck. High definition = visible, sharp jaw edge. Low definition = blended, soft transition.
Your angle and definition scores are ranked against population distributions from thousands of measurements to give you a percentile. 80th percentile means your jawline is more defined than 80% of measurements.
The jawline is the single most common below-average metric in our looksmaxxing test data — and one of the most studied in facial aesthetics research. A 2017 study by Sforza and colleagues measuring gonial angles in attractiveness-rated face sets found that men rated in the top quartile for attractiveness had average gonial angles of 127°, versus 142° for men rated in the bottom quartile. The 15° difference is substantial and overlaps significantly with the range improvable through fat loss.
Research by Penton-Voak and colleagues on cross-cultural facial attractiveness found that jawline definition was one of the most cross-culturally consistent attractiveness predictors for male faces — robust across Western, East Asian, and African populations. Unlike some facial preferences that vary by culture, the preference for defined jaw structure is consistent globally.
A 2019 study specifically examining the role of masseter muscle development in jaw aesthetics found that individuals who had performed regular jaw exercise (including competitive gum chewing as a sport in some cultures) had significantly lower gonial angles and higher attractiveness ratings than age-matched controls, controlling for body fat. This provides direct evidence for the mastic gum approach.
127° vs 142°
Average gonial angle — top vs bottom attractiveness quartile (Sforza 2017)
~70%
Of looksmaxxing test users score below average on jawline angle
5–7°
Average jawline improvement from fat loss + mastic gum over 12 weeks
Facial fat sits directly over the jawline, masking bone structure. Dropping from 20% to 13-14% body fat reveals jawline definition that was always there. You cannot spot-reduce facial fat — it comes off as overall body fat decreases. 300-500 calorie deficit with high protein intake (0.8g/lb) and resistance training to preserve muscle.
Mastic gum is ~10x harder than regular gum. Chewing 30-60 min daily builds the masseter muscles, creating the visible jaw "flare" that defines the jaw angle. Alternate sides every 10 minutes. You should feel jaw muscle fatigue — that's the training stimulus.
Forward head posture compresses the neck and pushes the chin forward, softening the jaw profile. Chin tucks (30 reps, 3x daily) and wall angels (10 reps, 2x daily) correct this within weeks. The improvement is partly postural and partly real — better posture also holds the head in a more flattering position for photos.
A clean shave below the jawline (everything below the jaw border) creates high contrast that makes the jaw edge read as sharper. Stubble or beard along the jaw adds shadow that enhances definition further. This doesn't change your actual jaw angle but significantly changes how it reads in photos and in person.
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AI measures your exact gonial angle and definition score from a single selfie, with percentile rankings and a personalized improvement plan. Free scan, full 17-metric report for $14.99.
Test My Jawline →AI detects the mandibular boundary landmarks and calculates the gonial angle — the angle at the jaw corner where the vertical ramus meets the horizontal mandibular body. Reported in degrees with a percentile ranking.
120-130° is elite (top ~10%). 131-140° is above average. 141-148° is average for most people. Above 149° scores below average. Most people improve significantly through fat loss alone.
Yes. Body fat reduction reveals underlying jaw definition (most impactful). Mastic gum builds masseter muscle. Posture correction sharpens the jaw profile. Combined, these can improve apparent jawline angle by 5-7° in 12 weeks.
Yes — gonial angle increases ~1-2° per decade after 30. Maintaining low body fat and strong jaw muscles slows this. Significant fat gain accelerates perceived jaw softening.
Cross-cultural research consistently finds defined jawline is among the most robust male attractiveness predictors. The preference holds across Western, East Asian, and African populations.
8-metric suite
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Each test measures a different facial metric. Run them all to get the full picture.
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Most-effective products for gonial angle and definition.
Collagen Peptides Powder (9.33oz)
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Results in 2-4 weeksThe Ordinary Retinol 0.5% in Squalane
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Results in 6-12 weeksCurated based on facial analysis data. No photos collected. Affiliate links — we earn a small commission at no extra cost to you.
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