# Lip Thickness

Harmony · Front view · Mouth · https://www.faceiqlabs.com/support/harmony/lip-thickness

The combined vertical height of the lips as a percentage of the lower face height.

> Supporting measurement: it currently has no weight in the Harmony score and is hidden in standard results.

## What is measured

Calculation: Cupid’s-bow-to-lower-lip height ÷ nasal-base-to-chin height × 100

## Why it matters

It describes how much of the lower face is occupied by the visible lip region. A taller lower face can reduce the percentage even when the lips themselves are unchanged.

- Lower: less lip height relative to the lower face.
- Higher: more lip height relative to the lower face.

## Where the idea comes from

Evidence: FaceIQ adaptation. Lip dimensions are studied in facial anthropometry. FaceIQ uses a vertical photo ratio; this differs from studies measuring tissue thickness or three-dimensional lip volume.

## A worked example

A 16-unit lip span in a 64-unit lower face gives 25%. This does not specify the upper-to-lower split.

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

## How to read your result

This supporting measurement has no Harmony score weight and is hidden in standard results. It is not lip height divided by mouth width.

## 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.

- Gibelli et al. (2015). [A Quantitative Analysis of Lip Aesthetics: The Influence of Gender and Aging](https://pubmed.ncbi.nlm.nih.gov/25948067/). Measured lip area, volume and thickness across sex and age groups. This describes lip morphology; it does not establish a universally attractive lower-to-upper lip ratio.

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