Harmony · Front view · Mouth
Lip Thickness
The combined vertical height of the lips as a percentage of the lower face height.
What is measured
The calculation
Cupid’s-bow-to-lower-lip height ÷ nasal-base-to-chin height × 100
Front view / Measurement guide
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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
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. [1]
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 and are not measurements of the schematic above.
Research & further reading
The sources below explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; these papers do not collectively validate the scoring system.
[1] Gibelli et al. · 2015
A Quantitative Analysis of Lip Aesthetics: The Influence of Gender and AgingMeasured 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.