# Lower Third

Harmony · Front view · Facial Thirds · https://www.faceiqlabs.com/support/harmony/lower-third

The height from the bottom of the nose to the bottom of the chin as a share of face height.

## What is measured

Calculation: Nose-bottom-to-chin height ÷ hairline-to-chin height × 100

## Why it matters

The lips and chin share this space. Its total height helps explain the balance between the upper face and lower face, while separate lip and chin ratios explain how that space is divided.

- Lower: a shorter lower face relative to the whole.
- Higher: a taller lower face relative to the whole.

## Where the idea comes from

Evidence: Classical proportion. Facial thirds grew out of artistic proportion canons and later anthropometry: the measurement of human form. Farkas and colleagues tested those rules in 1985. FaceIQ uses photographed brow landmarks to divide the face.

## A worked example

A 66-unit lower third in a 180-unit face is 36.7%. The three thirds share the same denominator and together account for the full face height.

Example values explain the calculation. They are not a target range.

## How to read your result

Keep the jaw relaxed and mouth closed naturally. A photo cannot establish bite alignment or explain the cause of a taller lower face.

## Research & further reading

These sources explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; the papers do not collectively validate the scoring system.

- Farkas et al. (1985). [Vertical and horizontal proportions of the face: revision of neoclassical canons](https://pubmed.ncbi.nlm.nih.gov/3883374/). Tested nine traditional proportion rules against measured faces. Useful history for facial thirds and width comparisons; classical rules are not universal targets.

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Source: https://www.faceiqlabs.com/support/harmony/lower-third · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt