# Ramus to Mandible Ratio

Harmony · Side view · Jaw · https://www.faceiqlabs.com/support/harmony/ramus-to-mandible-ratio

Constructed jaw-side length relative to constructed lower-border length.

## What is measured

Calculation: Tragus-to-jaw-line-intersection length ÷ intersection-to-chin-vertical length

Nasion means the nasal root, subnasale the nose base, and pogonion the most forward chin point. Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark.

## Why it matters

It compares the upright and lower portions of the jaw outline. A longer side portion and a shorter lower-border portion both increase the ratio.

- Lower: a shorter side segment relative to the lower segment.
- Higher: a longer side segment relative to the lower segment.

## Where the idea comes from

Evidence: FaceIQ adaptation. Comparing mandibular segments follows anatomical proportion analysis. FaceIQ constructs an intersection from photo border lines and ends the lower segment at the chin’s vertical line.

## A worked example

A 60-unit constructed side segment and 90-unit lower segment give 0.67.

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

## How to read your result

The photo’s tragus-based segment is a proxy, not the anatomical condyle-to-gonion ramus length.

## 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. (2005). [International anthropometric study of facial morphology in various ethnic groups/races](https://pubmed.ncbi.nlm.nih.gov/16077306/). Documents variation in facial dimensions across sampled populations. Descriptive measurements explain variation; they do not establish an attractiveness score.

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Source: https://www.faceiqlabs.com/support/harmony/ramus-to-mandible-ratio · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt