Facial Measurements

A facial measurement is defined by repeatable landmarks, not a visual impression. This series separates linear spans, angles, ratios, and growth questions, then shows the papers behind each definition.

Every guide states the view, landmarks, method, population, and evidence limits. A surface photograph can estimate geometry. It cannot reveal bone biology or turn an unmatched before and after pair into proof of structural change.

Start with the guides below, then read the broader definition of facial dimorphism. If you want the landmarks applied to your own photos, see the Healthmaxxing Shastra facial analysis.

• Chin Width: How the Mental Region Shapes the Lower Face. How to measure chin width relative to jaw width, choose repeatable borders and interpret mixed findings from CT and photographic studies.
• Nasomental Angle: Nose and Chin Balance in Side Profile. Trace the nasomental angle, understand its nose and chin components, and read preference and surgical studies with their sample limits.
• Nasolabial Angle: How to Measure the Nose–Lip Angle. Find subnasale and measure the angle between the columella and upper lip. Learn why lip posture, nasal rotation and tangent choice change the result.
• Facial Convexity Angle: Glabella, Nasion and Measurement. How to measure facial convexity using glabella, subnasale and pogonion, why nasion gives a different construction, and how to read the angle.
• Chin Height: How to Measure Your Lower-Face Proportion. Measure chin height from a named mouth or chin-fold landmark to menton. Calculate its lower-face proportion and avoid head-tilt and photo-scaling errors.
• Ricketts E Line: Lip Position Between Nose and Chin. Draw the Ricketts E line, measure signed lip distances and understand how nose, chin, age and image presentation affect interpretation.
• Nasal Tip Projection: Goode Ratio, Landmarks, and Profile Balance. Understand nasal tip projection and the Goode ratio, distinguish projection from rotation, and interpret photographic and rhinoplasty research.
• Nasofrontal Angle: How Forehead and Nasal Root Shape the Profile. Locate the nasofrontal angle, compare landmark methods and interpret CT, photographic and aging studies without treating sample means as targets.
• Double Break Angle: What the Nasal Profile Measurement Actually Shows. Understand the nasal supratip break, trace its contour consistently and separate photographic measurements from preference and rhinoplasty evidence.
• Nasion and Radix: Anatomy, Measurement and Growth Evidence. Locate nasion and radix, compare nasal-root photographs and understand what human, animal and cell studies establish about growth and suture loading.
• Lower Face Height Ratio: Subnasale, Stomion, and Menton. Calculate lower-face proportions using subnasale, stomion and menton. See a worked example, photographic limits and the evidence behind reference proportions.
• Labiomental Angle: Lower Lip, Chin Fold, and Profile Shape. The bend between your lower lip and chin at the labiomental fold. Smaller is deeper and sharper. Larger is flatter. Muscle tension fakes a deep fold. Shastra reads it with the chin.
• Facial Thirds: How Vertical Face Proportions Are Measured. Facial thirds cut your front view at trichion, glabella, subnasale, and menton. The landmarks, the evidence, camera limits, and how Shastra reads them.
• Facial Fifths: Eye Spacing, Nose Width, and Face Balance. Facial fifths cut frontal width through your eye corners and outer contours. The real landmarks, population evidence, image errors, and how Shastra reads them.
• Facial Width to Height Ratio: Measurement, Meaning, and Limits. Facial width to height ratio compares cheekbone breadth with upper face height. Competing definitions, age and body size confounds, and how Shastra reads the ratio.
• Canthal Tilt: How You Measure Eye Corner Inclination. The angle from your inner eye corner to the outer one. How to mark it, what positive and negative tilt mean, how age and population change the number, and how Shastra reads it.
• Eye Aperture: How You Measure Vertical Palpebral Fissure Height. The visible vertical opening between your eyelid margins. How to measure it, what expression and age do to the number, population norms, and how Shastra reads it.
• Intercanthal Distance: How You Measure the Space Between the Eyes. The span between your inner eye corners. How to use ratios, how population and sex change the number, camera errors, and how Shastra reads spacing.
• Palpebral Fissure Length: How You Measure Horizontal Eye Length. The span from your inner eye corner to the outer one. How to mark it, which ratios to use, how age and population change the number, and how Shastra reads it.
• Gonial Angle: Normal Range and How to Measure It. What the gonial angle measures, what a smaller or larger jaw angle means, and how Ar–Go–Me measurement differs from a side-profile photo.
• Jaw Width: Measurement and Square Jaw Shape. Jaw width is bigonial width, the go-go span between the jaw angles. How it is measured, why it reads square, and what is actually shown for DHT, T3, progesterone, and suture traction.