# Mouth-to-Nose Width Ratio

Harmony · Front view · Mouth · https://www.faceiqlabs.com/support/harmony/mouth-width-to-nose-width-ratio

The horizontal mouth width compared with nose-base width.

## What is measured

Calculation: Mouth-corner width ÷ alar nose width

## Why it matters

It connects two neighboring features. The same mouth may seem relatively wide next to a narrow nose and relatively narrow next to a broad nose.

- Lower: a narrower mouth relative to the nose.
- Higher: a wider mouth relative to the nose.

## Where the idea comes from

Evidence: Classical proportion. Comparing widths belongs to the anthropometric tradition. FaceIQ expresses these photographed distances as a ratio; population measurements provide context rather than proof of this particular scoring range.

## A worked example

A 51-unit mouth and 35-unit nose give 51 ÷ 35 ≈ 1.46. This says nothing about lip thickness.

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

## How to read your result

Smiling widens the mouth. Use relaxed corners and the outer nasal-wing borders.

## 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/mouth-width-to-nose-width-ratio · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt