Measure nose width relative to nose length with marked alar and bridge-to-tip landmarks. Classify leptorrhine, mesorrhine, or platyrrhine proportions instantly in your browser.
For highest precision: keep your head vertical, look straight into the lens, avoid smiling or wrinkling the nose.
The Nasal Index is one of physical anthropology's primary diagnostic measurements, defined as the ratio of maximum nasal aperture breadth (alar-to-alar) to anatomical nasal height (nasion to subnasale), multiplied by 100.
Historically classified into Leptorrhine (< 70, narrow/tall), Mesorrhine (70–84.9, medium), and Platyrrhine (≥ 85, broad), nasal morphology developed through evolutionary climate adaptation and genetic heritage.
In aesthetic medicine and rhinoplasty, neoclassical canons expect the alar base width to match the intercanthal distance between the eyes (a 1.0 ratio).
Everything you need to know about the nasal index and nose proportions.
The Nasal Index (NI) is calculated as: (Alar Base Width / Nasal Height from Nasion to Subnasale) × 100.
Test your rule of five, eye spacing, golden ratio, and vertical thirds.
Upload a front-facing photo and see how evenly your face width divides into the classic five vertical facial sections.
Measure pupil spacing relative to overall face width with a marked facial-width guide.
Check classic face, nose, mouth, and lower-face proportions in one free marked result.
Compare the measurable middle facial third to the lower facial third with marked guides.
