Facial Thirds Test

Facial thirds are a classical proportion concept, codified by artists like Leonardo da Vinci and Albrecht Dürer, that divides the face into three horizontal zones of roughly equal height: the upper third (hairline to the brow), the middle third (brow to the base of the nose), and the lower third (base of the nose to the chin). In an idealised canon, each third makes up close to 33% of total face height.

A facial thirds test measures the actual height of your upper, middle, and lower face from a photo and compares each to the classical one-third-each ideal. This calculator automates that process: it detects 478 facial landmarks with MediaPipe, locates the hairline-approximate point, the glabella (between the brows), the base of the nose, and the chin, then computes each third as a percentage of total face height.

Midface ratio compares the distance between the centres of your pupils (bipupillary distance) to the vertical distance from the base of your nose to your upper lip. A ratio close to 1:1 is considered typical in aesthetic literature. It is a separate measurement from facial thirds, focused specifically on the central lower-face region.

There is no single scientifically validated "ideal" — the classical canon describing equal thirds and a 1:1 midface ratio comes from Renaissance art theory, not from empirical population averages. Most real faces deviate from this canon in one or more thirds, and that is completely normal. This tool reports your measured values against the classical reference points so you can see where you land, not to suggest any value is objectively better.

The facial thirds canon was documented by Leonardo da Vinci in his anatomical notebooks (c. 1490–1519) and later codified by Albrecht Dürer in Four Books on Human Proportion (1528), both describing idealised proportions derived from classical Greco-Roman sculpture — an artistic convention, not an empirically validated biological average.

No. Facial thirds deviate from the classical one-third-each canon in the vast majority of real faces due to entirely normal variation in forehead height, midface length, and jaw/chin proportion. This measurement is descriptive only — it does not indicate a health, developmental, or aesthetic problem.

Accuracy depends on photo quality and the fact that the hairline point used for the upper third is approximated from the topmost point of the MediaPipe face mesh, not a true trichion landmark — hair covering the forehead can shift this. A clear, front-facing photo with the forehead visible, even lighting, and no head tilt gives the most reliable reading.

No. This calculator is an educational, geometry-based tool intended for curiosity and self-exploration — it is not a diagnostic or medical device and does not provide medical advice.

The golden ratio face calculator measures five separate proportions against φ = 1.618 (the golden ratio), such as face length to width and mouth width to nose width. This tool instead measures the classical facial-thirds canon (equal horizontal zones) and the midface ratio — related but distinct proportion systems, both offered here.