# Nasofacial Angle

Harmony · Side view · Nose · https://www.faceiqlabs.com/support/harmony/nasofacial-angle

The angle at the nasal root between the nose-tip direction and the chin direction.

## What is measured

Calculation: Acute angle: pronasale → nasion → pogonion

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 places the nose against a broader facial line. A change in chin projection alters that line and can change the apparent prominence of the same nose.

- Lower: the nose-tip and chin directions are closer together.
- Higher: the directions diverge more.

## Where the idea comes from

Evidence: Clinical reference. Nasal angles and projection are used to describe profile shape. Preference studies have tested edited noses; FaceIQ’s particular landmarks and score ranges should not be treated as universal conclusions from those studies.

## A worked example

A 30° result means the two rays from the nasal root diverge by 30°. Moving the chin can alter that angle without changing nose length.

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

## How to read your result

FaceIQ uses a nasion-to-chin reference. A paper that uses a different facial plane may report a different angle.

## 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.

- Tavakoli et al. (2023). [Ideal Nasal Preferences: A Quantitative Investigation with 3D Imaging in the Iranian Population](https://pubmed.ncbi.nlm.nih.gov/37564715/). Asked 203 volunteers to rate edited nose features on one male and one female model. Supports studying angles and projection together, with limits from the sampled faces and raters.

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