Six Shapes · Four Ratios

Face shape calculator

RealSmile Research Team · Facial Analysis Specialists
Updated May 19, 2026
Based on 5 peer-reviewed sources
→ See our methodology

Forehead, cheek, jaw, length. Four ratios in. Oval, round, square, heart, diamond, or oblong out — with confidence band.

Ratio-based classification matches Farkas anthropometric tables. Returns the dominant shape plus the closeness to the next-closest shape.

17 metrics · Free · No signup

Free score · $14.99 unlocks the four-ratio report with hairstyle picks

The four ratios the calculator measures

Length-to-width ratio. Face length (hairline to chin) divided by face width (widest cheek measurement). Oval faces sit at approximately 1.5; round faces sit close to 1.0; oblong faces sit above 1.6. This is the most diagnostic single ratio.

Forehead width over cheek width. A forehead wider than the cheekbones points toward a heart or oblong classification; a forehead narrower than the cheekbones points toward a diamond classification.

Jaw width over cheek width. A jaw wider than or equal to the cheekbones points toward a square or round classification; a noticeably narrower jaw points toward a heart or oval classification.

Chin angle and projection. A pointed chin (acute angle under 110 degrees) shifts the read toward heart or diamond; a flat chin angle (above 130 degrees) shifts toward square or oblong. The angle is measured at the soft-tissue chin tip.

The six shapes and their ratio signatures

Oval

Length 1.5 times width. Cheeks slightly wider than forehead and jaw. Soft, rounded jaw line. Considered the most flexible shape for hairstyles and framing choices.

Round

Length close to width (1.0 to 1.2). Soft jaw angle. Cheeks are the widest point. Tends to read as youthful; hairstyle goal is usually to add visible length.

Square

Length close to width with defined jaw angle. Forehead and jaw width similar. Reads as structured. Hair and beard goal is usually to soften the angles or lean into them.

Heart

Forehead wider than jaw. Pointed chin. Cheeks intermediate width. Hairstyle goal is usually to balance the wider top with width at the jaw line.

Diamond

Narrow forehead, widest at the cheeks, narrow jaw. Pointed chin. Less common shape. Hairstyle goal is usually to widen the forehead and balance the cheek width.

Oblong

Length more than 1.6 times width. Forehead, cheeks, and jaw similar width. Reads as long. Hairstyle goal is usually to add visible width and break vertical line.

How to take the photo for the cleanest read

Straight-on angle. Camera at eye level. Flat daylight without strong directional shadow. Hair pulled back off the forehead and ears. Neutral expression, lips closed, teeth not clenched. Plain wall behind you. No glasses, no hat. The four ratio measurements only work if the four input widths are visible. Hair across the forehead or jaw line is the most common cause of a misclassification on the first attempt.

If the confidence band on the first scan is under 70 percent, retake with hair clipped back and a straight-on angle. The calculator returns the same shape consistently when the input photo meets the criteria. The shape does not change between scans; only the confidence band does.

Honest limits

Face shape calculator FAQ

How does a face shape calculator actually classify a face?+
A face shape classifier measures four ratios from facial landmarks: face length over face width (the height-to-width ratio), forehead width over cheek width, jaw width over cheek width, and chin angle. The combination of those four ratios maps to one of six standard shapes: oval, round, square, heart, diamond, oblong. The calculator on this page uses the same 68-point facial landmark model used in cosmetic research workflows, applied to a single photo. The returned classification is paired with a confidence percentage that reflects how cleanly the face fits the prototype shape.
What are the six face shapes the calculator returns?+
Oval: face length approximately 1.5 times face width, gently rounded jaw, slightly wider cheeks than forehead and jaw. Round: face length close to face width, soft jaw angle. Square: face length close to face width, defined jaw angle, forehead and jaw width similar. Heart: wider forehead, narrower jaw, pointed chin. Diamond: narrow forehead, widest at cheeks, narrow jaw. Oblong: face length more than 1.6 times face width, similar widths across forehead, cheeks, and jaw. Most real faces sit between two shapes; the calculator returns the dominant shape with the closeness to the next-closest shape as a secondary signal.
How accurate is a single-photo face shape calculation?+
Face shape classification from a straight-on photo with neutral expression and flat daylight is consistent with manual anthropometric measurement at roughly the 85 to 92 percent agreement rate in the research literature on automated facial landmark detection. The two biggest failure modes are angle (any head tilt above 8 degrees can shift the apparent ratio by enough to misclassify) and hair coverage (hair across the forehead or jaw line hides the actual width). The calculator returns a confidence band that reflects how clean the input was; under 70 percent confidence usually means a retake with hair pulled back and a straight-on angle will move the result.
Why do different face shape sites give me different shapes?+
Most face shape tools online use loose visual cues (looks pointed = heart, looks long = oblong) rather than actual ratios. The disagreement across sites usually comes from three places: photo angle differences, different landmark sets (some tools only use 5 to 7 points instead of 68), and ad-hoc threshold values for what counts as "wider" or "narrower." A ratio-based calculator with confidence reporting is more reproducible because the inputs are explicit. The math is also auditable: the calculator on this page returns the four ratio values so you can verify the classification against the published shape definitions in Farkas anthropometry tables.
Does face shape affect attractiveness?+
On the published research, face shape contributes to attractiveness ratings through three mechanisms. First, length-to-width ratio: oval faces (ratio approximately 1.5) are rated as more attractive on average across both sexes (Cunningham, 1986). Second, sex dimorphism: in male faces, more squared jaw lines correlate with masculinity ratings; in female faces, more rounded jaw lines correlate with femininity ratings (Perrett et al., 1998). Third, contrast: the same person reads differently with different framing (hair, beard, glasses) that changes the apparent shape. Face shape is one of 17 metrics, not the whole story.
Can I change my face shape?+
Bone structure is fixed in adults. The underlying face shape does not change without surgery. What changes the perceived face shape are three soft-tissue and grooming levers. First, body composition: a 4 to 6 percent body fat reduction often shifts a round-leaning face toward oval by revealing underlying bone. Second, hairstyle: the right cut for the underlying shape can shift the apparent face from one category to an adjacent one (this is what the hairstyle pages on the site cover). Third, facial hair shaping: beard length and edge can narrow or widen the lower third of the face by a measurable amount. The bone does not change; the read does.
How does face shape interact with the full 17-metric score?+
Face shape is the geometric backdrop against which the other 16 metrics are evaluated. The same canthal tilt looks different on a square face versus a heart face. The same lower-third length looks short on an oblong face and proportional on a round face. The 17-metric scan returns both the face shape classification and the 16 metrics scored in the context of that shape, so the recommendations in the $14.99 report are calibrated to your specific underlying geometry rather than a generic average.
What does the $14.99 report add to the free calculator?+
The free calculator returns the dominant shape and confidence band. The $14.99 report adds the four ratio values with comparison to population norms, a written interpretation of how your shape interacts with your other 16 metrics, the ranked hairstyle and grooming recommendations for your specific shape (linked to dedicated pages for each), and the 30-day action plan for the soft-tissue and framing levers that can shift the read.

Four ratios. Six shapes. Hairstyle picks calibrated to your geometry.

Unlock the four-ratio report.

$14.99 unlocks the full 17-metric PDF: ratio values with population comparison, hairstyle picks for your specific shape, and the 30-day action plan.

Calculate your face shape now

Free, instant, private. Four ratios, six shapes, confidence band — plus 13 more metrics in the full report.

17 metrics · Photos auto-deleted · Re-scan as often as you want

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