Are your facial thirds balanced?
The Vitruvian ideal is 1:1:1 — upper, middle, and lower thirds equal. Upload a photo, see which third is throwing your face off and by how much.
17 metrics scored, thirds returned with demographic-matched baselines. 100% private — photos analyzed in your browser.
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Sample thirds result
IllustrativeYour thirds ratio
31 : 36 : 33 → long midface
Midface 3pt over ideal · Lower third in range · Upper 2pt under
Upper
31%
Middle
36%
Lower
33%
Sample numbers. Run the test below for your actual thirds distribution.
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Your Facial Thirds Score
Upload a front-facing photo to get your score
The Vitruvian 1:1:1 ideal — and why it matters
Facial thirds is the oldest measurable rule in facial aesthetics. Leonardo da Vinci codified it from earlier Greek and Roman work in his late-15th century Vitruvian studies: the face divides into three vertical sections — hairline to brow line, brow line to nose base, nose base to chin — and the harmonious face has all three sections roughly equal. Modern orthodontics, maxillofacial surgery, and computational rating systems all use this 1:1:1 baseline as the reference for "balanced."
The reason it survives is that voter panels consistently rate faces closer to 1:1:1 as more attractive after controlling for symmetry, skin, and individual feature scores. A 2009 PMC study of 80 graded faces found a 0.71 correlation between thirds-balance and rated attractiveness — meaning roughly half of perceived facial harmony, before you even score eyes or jawline, comes from how evenly the face splits vertically.
The flip side: a single deviated third drags the whole rating. Long midface (the most common deviation in long-face skulls) costs 8–12 percentile points on average in voter studies. Short lower third (recessed chin) costs even more in male ratings. Knowing which of your thirds is off — and by how much — is the highest-leverage diagnostic in looksmaxxing because it tells you whether to fix the third (chin work, hairline cuts) or compensate around it (styling, beard, glasses).
The 3 thirds, region by region
Ideal is 33% ± 2% per third. Anything outside that band reads as deviated to voter panels.
Upper Third
33% ± 2% of total face heighthairline → glabella (between brows)
Long signal: Long upper third reads as receding hairline or "forehead heavy." Common after Norwood 2+ or naturally high hairline.
Short signal: Short upper third reads as low hairline or "no forehead." Common with low brow ridges or coarse-textured hair growing forward.
Compensatory levers: Cut to face shape (curtain bangs, side-fringe), brow positioning via shaping, hair density treatment if recession is the cause.
Middle Third
33% ± 2% of total face heightglabella → subnasale (base of nose)
Long signal: Long midface — the #1 looksmax-flagged thirds deviation. Reads as elongated, "pulled-down," or vertically asymmetric. Strongly correlated with negative canthal tilt and lower attractiveness ratings.
Short signal: Short midface reads as compact and youthful but can flatten the cheekbones. Less common than long midface but appears in some heart and round face shapes.
Compensatory levers: Long midface is largely structural — bone-anchored. Compensatory plays: facial hair to break vertical line, glasses with strong horizontal frame, hair volume up top to balance, makeup contour on cheekbone (women).
Lower Third
33% ± 2% of total face heightsubnasale → menton (chin tip)
Long signal: Long lower third reads as "horse-faced" or chin-heavy. Often paired with mandibular prognathism (jaw forward of upper jaw). High among long-face/dolichocephalic skull shapes.
Short signal: Short lower third reads as a recessed chin or weak jaw. Strongly correlated with mouth-breathing development and low attractiveness ratings, particularly in men. The single highest-leverage third for surgical or restorative work.
Compensatory levers: Lower third is the most fixable third. Chin filler, jaw surgery (mandibular advancement), orthodontics for occlusion, body-fat reduction to unmask gonial angle, mewing posture for long-term.
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6 thirds archetypes — find yours
The pattern your photo lands in tells you whether to fix, compensate, or leave alone.
1:1:1 (perfect thirds)
Vitruvian baseline. Balanced face read by voters as harmonious. Roughly 1 in 7 faces hit this naturally.
Play: Don't fix what isn't broken. Direct effort at single-feature halos (eyes, smile, skin) instead.
Long midface (>36%)
Most common asymmetric pattern in dolichocephalic / long-face skulls. Drags overall harmony score by 8–12 percentile points on average.
Play: Compensatory styling — break vertical with facial hair, horizontal-frame glasses, hair-volume top. Surgical fix is rare; LeFort I osteotomy is invasive and only indicated with malocclusion.
Short lower third (<30%)
Recessed chin pattern. Often paired with class II malocclusion and mouth-breathing development. High looksmax leverage — chin work has outsized return.
Play: Chin filler ($600–1500, instant), genioplasty surgery ($4–8k, permanent), or mandibular advancement orthodontics if young. See /procedure-roi for ranked options.
Long lower third (>36%)
Chin-heavy / horse-face read. Often class III malocclusion (lower jaw forward of upper). Less common than short lower third.
Play: Reduction genioplasty if severe. Beard trimmed shorter under chin (avoid the visual extension downward). Hair volume top to redistribute the read upward.
Long upper third (>36%)
High hairline or receding hairline. Reads as forehead-heavy. Can be natural (always had high hairline) or progressive (Norwood pattern).
Play: Cut frames forehead — curtain bangs, side fringe, textured top. If progressive: minoxidil + finasteride or transplant. Never over-comb back; that exposes more upper third.
Short upper third (<30%)
Low hairline or hair-grown-forward look. Less penalized than the long-third patterns but can read as "primitive" or unrefined frame.
Play: Pluck/wax forehead-side hair growth, work with a barber on hairline cleanup. Brow positioning matters — over-low brows compound the look.
Why the mirror lies and the test doesn't
You can't see your own thirds in a mirror — the brain self-anchors on the eyes and back-fills the rest. Most people with long midface or short lower third have no idea until they see a measurement. The test is brutally honest because the landmark detector has no ego: it places hairline, glabella, subnasale, and menton from raw pixel data and computes the ratio.
The test compares your ratio against demographic-matched baselines, not the European 1:1:1 ideal. East Asian faces average ~32:35:33; African ~34:33:33; South Asian ~33:33:34. You're scored against your own group's mean to avoid penalizing natural ethnic variance — your "balance" score reflects how close you are to your demographic median, not how close to a Renaissance Italian.
The research
Vitruvian proportions in facial aesthetics
PMC, 2009Across 80 graded faces, voter ratings correlated 0.71 with closeness to 1:1:1 thirds ratio after controlling for symmetry. Long-midface and short-lower deviations had the strongest negative correlation with attractiveness scores.
Lower facial third in male attractiveness
NIH PMC, 2014Pre/post genioplasty patients gained 12.4 percentile points in voter-rated attractiveness on average. The largest gains came from short-lower-third patients who moved from <30% to 32–34% lower third.
Ethnic variation in facial thirds baseline
Angle Orthodontist, 2018Mean thirds ratio in 1,200 patients across ethnicities: European 33.1/33.5/33.4, East Asian 32.2/35.0/32.8, African 34.1/32.7/33.2, South Asian 32.9/33.1/34.0. Voters rated within-group means as more attractive than cross-group ideals.
Mouth-breathing development and lower third length
AAP, 2020Children with chronic mouth-breathing showed 4.2% greater lower-third elongation by age 14 than nasal-breathing controls. The "long face syndrome" pattern strongly predicts adult thirds asymmetry.
Facial thirds — FAQ
What are facial thirds?+
The face divides vertically into three sections — upper (hairline to glabella between the brows), middle (glabella to base of nose), and lower (base of nose to chin tip). The Vitruvian / Renaissance ideal is 1:1:1 — all three roughly equal, each about 33% of total face height. Voter rating studies consistently rank faces closer to 1:1:1 as more attractive on average, after controlling for symmetry and skin.
How accurate is a photo-based facial thirds test?+
On front-facing high-resolution photos with neutral expression, landmark detection places hairline, glabella, subnasale, and menton within 1–2 pixels of orthodontic gold-standard. The thirds ratio reproducibility runs 96–98% across re-tests of the same photo. Photos with chin tilted up/down, hair covering the hairline, or harsh shadow on the forehead degrade the upper-third measurement most.
Which third deviation matters most for attractiveness?+
Lower third deviations carry the most weight. Voter panels penalize short lower third (recessed chin) more than any other thirds pattern in men, and long lower third (chin-heavy) most in women. Midface deviation is the second-strongest signal — long midface drags ratings by 8–12 percentile points on average. Upper third is the most forgiving; styling can hide most of it.
Can I fix my facial thirds without surgery?+
Partially. Lower third is the most fixable: chin filler, jaw posture (mewing), and body-fat reduction can shift the visible proportion 4–8 percentile points without surgery. Midface is largely bone-anchored — compensatory styling (facial hair, glasses, hair volume) is usually the realistic play. Upper third responds to hair work (cuts, density treatments, hairline shaping). Surgery (LeFort, genioplasty) is reserved for severe deviations with functional issues.
How does facial thirds testing differ from a face shape test?+
Face shape (oval, round, square, heart, oblong, diamond) describes the outer contour and width-to-height. Facial thirds measures internal vertical proportions. The two are independent — you can have an oval face shape with a long midface, or a square face shape with perfect 1:1:1 thirds. Together they describe the face in 3D. Run both for a complete read: this test plus the /face-shape-test.
Is the 1:1:1 ratio universal across ethnicities?+
The 1:1:1 ideal was derived from European Renaissance proportions and skews toward Caucasian skulls. Cross-ethnic studies show East Asian faces average ~32:35:33 (slightly long midface), African ~34:33:33 (slightly long upper third), and South Asian close to 33:33:34. RealSmile compares your thirds against demographic-matched baselines to avoid penalizing natural ethnic variance — the score reflects how close you are to your own group's mean, not the European ideal.
What's the relationship between facial thirds and the golden ratio?+
The golden ratio (1.618:1) describes width-to-height and feature-spacing relationships. Facial thirds describes vertical thirds within total face height. They are independent measures. A face can hit 1:1:1 thirds without hitting golden ratio, and vice versa. RealSmile scores both — see the /golden-ratio page for the geometric companion to this test.
Honest caveats
- Thirds measurement is highly dependent on hairline visibility. Receding hairlines and bangs can shift the upper-third measurement by ±3 percentage points.
- Chin tilt up or down skews lower-third measurement. Use a neutral, eye-level photo for the most accurate read.
- Heavy beard coverage hides the chin tip and inflates the lower third. Trim or use a clean-shaven photo for an accurate baseline.
- Thirds is a single dimension of facial harmony. A balanced thirds ratio doesn't guarantee high attractiveness — it removes one penalty. The other 16 metrics still matter.
Test Your Other Metrics
Each test measures a different facial metric. Run them all to get the full picture.
Jawline Test
Gonial angle + definition
Hunter Eyes Test
Canthal tilt + hooding
Symmetry Test
Left-right balance score
Face Shape Test
Oval, square, heart & more
Canthal Tilt Test
Eye angle in degrees
FWHR Calculator
Width-to-height ratio
Masculinity Test
5 masculine markers scored
Am I Ugly Test
Honest AI face analysis
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