Last verified · v1.0

Calculator · general

Face Shape Calculator

Determine your face shape by entering four measurements. Classifies oval, round, square, heart, diamond, oblong, and triangle shapes using facial ratios.

FreeInstantNo signupOpen source

Inputs

Forehead Width

Cheekbone Width

Jawline Width

Face Length

Face Shape Code (1=Oval, 2=Round, 3=Square, 4=Oblong/Rectangle, 5=Heart, 6=Diamond)

—

Get a plain-English breakdown of your result with practical next steps.

Face Shape Code (1=Oval, 2=Round, 3=Square, 4=Oblong/Rectangle, 5=Heart, 6=Diamond)—

The formula

How the
result is
computed.

How the Face Shape Calculator Works

The face shape calculator applies a ratio-based classification system grounded in facial anthropometry — the scientific measurement of the human face. By evaluating four key measurements, the calculator computes three dimensionless ratios that map to one of seven canonical face shape categories: oval, round, square, heart, diamond, oblong, and triangle.

The Core Formula

The classification function is expressed as:

Shape = f(L / W_c, W_f / W_c, W_j / W_c)

The cheekbone width (W_c) serves as the reference denominator because it represents the widest and most structurally consistent measurement of the face. Dividing all other dimensions by cheekbone width normalizes the ratios, making classification independent of absolute head size. Research published in the NCBI study on machine learning-based facial beauty prediction and analysis confirms that ratio-based facial features outperform raw measurements in face shape classification tasks, supporting the validity of this approach.

Variables Explained

Face Length (L): Measured from the center of the hairline straight down to the tip of the chin. This is the primary vertical dimension and drives the length-to-width ratio central to distinguishing elongated shapes from compact ones.
Cheekbone Width (W_c): Measured across the widest part of the face, from the outer edge of one cheekbone to the other, just below the outer corner of each eye. This is the reference baseline for all ratio calculations.
Forehead Width (W_f): Measured across the widest part of the forehead, from temple to temple, approximately halfway between the eyebrows and the hairline.
Jawline Width (W_j): Measured from the tip of the chin to the angle of the jaw below the ear, then doubled to produce the total jaw width across the face.

Face Shape Classification Thresholds

The calculator evaluates all three ratios against empirically established threshold ranges to assign a shape label. The following criteria define each classification:

Oval: L/W_c between 1.4 and 1.6; W_f/W_c between 0.75 and 0.90; W_j/W_c slightly narrower than the forehead ratio. The forehead and jawline are similarly sized, with cheekbones as the widest point.
Round: L/W_c between 1.0 and 1.2; W_f/W_c and W_j/W_c both between 0.85 and 0.95. Face length and width are nearly equal, producing a circular silhouette.
Square: L/W_c between 1.0 and 1.3; W_f/W_c and W_j/W_c both above 0.90, with a strong, angular jawline that matches the forehead in width.
Heart (Inverted Triangle): W_f/W_c above 1.0; W_j/W_c below 0.75. A wide forehead tapers dramatically to a narrow, often pointed chin.
Diamond: W_f/W_c below 0.85; W_j/W_c below 0.85; L/W_c above 1.3. The cheekbones dominate as the widest feature, with both the forehead and jaw noticeably narrower.
Oblong (Rectangle): L/W_c above 1.5; W_f/W_c and W_j/W_c both above 0.90. The face is notably longer than wide, with roughly equal widths at forehead, cheekbones, and jaw.
Triangle (Pear): W_j/W_c above 1.0; W_f/W_c below 0.85. A wide jaw tapers upward to a narrow forehead, the inverse of the heart shape.

Worked Example

Consider the following measurements in centimeters: Face Length = 23 cm, Cheekbone Width = 15 cm, Forehead Width = 13 cm, Jawline Width = 11 cm.

Computing the ratios: L/W_c = 23 / 15 = 1.53; W_f/W_c = 13 / 15 = 0.87; W_j/W_c = 11 / 15 = 0.73.

With L/W_c = 1.53 (within the 1.4–1.6 oval range), W_f/W_c = 0.87, and W_j/W_c = 0.73 (jaw narrower than forehead), the calculator classifies this profile as Oval — the shape most frequently associated with aesthetic balance in clinical and styling literature.

Clinical and Practical Applications

Facial morphology data informs decisions in hairstyling, eyewear selection, makeup contouring, and cosmetic surgery planning. The Harvard Medical School Department of Facial Plastic Surgery uses geometric facial measurements as foundational inputs for surgical planning and aesthetic evaluation. Understanding face shape ratios equips both professionals and individuals to make evidence-based decisions grounded in quantified facial geometry.

Reference

Frequently asked questions

What are the 7 face shapes the face shape calculator identifies?

The face shape calculator identifies seven shapes: oval, round, square, heart (inverted triangle), diamond, oblong (rectangle), and triangle (pear). Each shape corresponds to specific ratio thresholds between face length, cheekbone width, forehead width, and jawline width. Oval is the most symmetrical classification, featuring a length-to-cheekbone ratio between 1.4 and 1.6 and a forehead slightly wider than the jaw.

How do you measure cheekbone width accurately for the face shape calculator?

To measure cheekbone width, place a flexible tape measure at the outer edge of the cheekbone directly below the outer corner of one eye, then extend it across to the same point on the opposite side. This measurement represents the widest horizontal dimension of the face and serves as the reference denominator in the face shape formula. For most adults, cheekbone width falls between 13 and 16 centimeters.

What is the ideal face shape according to beauty and facial research?

Beauty research, including a peer-reviewed NCBI study (PMC8413070) on machine learning-based facial beauty prediction, consistently identifies the oval face shape as closest to classical aesthetic ideals. The oval shape features a face length roughly 1.5 times the cheekbone width, a forehead slightly wider than the jaw, and gently rounded contours — proportions associated with balance and symmetry across diverse populations and cultures.

Can the face shape calculator help with hairstyle and eyewear recommendations?

Yes. The face shape classification produced by this calculator directly informs hairstyle, eyewear frame, and makeup contouring decisions. Round faces benefit from angular eyewear frames and hairstyles with crown volume, while square faces suit round or oval frames with soft layered cuts. Heart-shaped faces are complemented by wider-bottomed frames. Knowing the precise face shape ratio allows stylists and individuals to apply these evidence-based recommendations with greater accuracy.

How accurate is a face shape calculator compared to a professional assessment?

A ratio-based face shape calculator delivers reliable first-order classification when all four measurements are taken carefully. Professional facial assessments — such as those conducted at the Harvard Medical School Department of Facial Plastic Surgery — incorporate additional variables including facial symmetry indices, proportional thirds, and soft tissue depth. For everyday styling and cosmetic decisions, the calculator's ratio method is accurate enough to guide practical choices. Measurement precision improves by repeating each measurement twice and averaging the results.

What units should measurements be in for the face shape calculator?

The face shape calculator accepts measurements in any consistent unit — centimeters, millimeters, or inches all produce the same result. Because the formula relies entirely on dimensionless ratios such as face length divided by cheekbone width, the unit of measurement cancels out mathematically. The only requirement is consistency: all four measurements must use the same unit. Most adults find centimeters most convenient, as typical facial measurements range from approximately 10 to 25 centimeters.