Harmony · Front view · Mouth
Lower Lip to Upper Lip Ratio
The visible height of the lower lip compared with the upper lip.
What is measured
The calculation
Mouth-seam-to-lower-lip height ÷ Cupid’s-bow-to-mouth-seam height
Front view / Measurement guide
Follow the measurement
Select a label to focus on its line. Select again to show all measurements.
Why it matters
This separates relative lip balance from overall fullness. Two mouths can have the same total lip height but distribute it differently between upper and lower lips.
- Below 1: the upper lip is taller than the lower lip.
- Above 1: the lower lip is taller than the upper lip.
Where the idea comes from
FaceIQ adaptation
Upper and lower lip dimensions belong to anthropometric lip analysis. Research describes variation by age and sex; it does not establish 1.618 or another single ratio as universally ideal. [1]
A worked example
A lower lip 9 units tall and upper lip 6 units tall give 1.5. Enlarging both proportionally leaves that ratio unchanged.
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.