FORMA FEATURE / MOUTH & LIPSLip Proportions: Upper-to-Lower Lip Ratio and Facial Balance
Vermilion is the colored lip tissue. Upper-to-lower height, absolute fullness, border shape, and forward projection describe different aspects of lip appearance. This page separates published measurements from interpretation, preference experiments, and community speculation.
What lip proportions & projection means
Compare central upper and lower vermilion heights at rest. In profile, the E-line joins nasal tip to chin; lip-to-line distances therefore depend on both nose and chin.
Facial measurements only become comparable when the view, head position, soft-tissue landmarks, and endpoint definitions are held constant. A number copied from a profile photograph is not interchangeable with a value measured from a clinical scan or a front-facing portrait.
Official measurements, ratios & competing claims
1 : 1 A contrasting Chinese study
Among 303 Chinese observers, equal upper/lower vermilion proportions were preferred for both male and female stimuli.
Study: Based on modified images of one young man and one young woman; cannot represent all faces or all Chinese preferences. The Ideal Chinese Lip: Impact of Lip Contours and Proportions
Practical takeaway
A lower lip as full as, or fuller than, the upper is a useful comparison.
The studies below favor different balances within that description. Choose the relevant population and face context before treating either ratio as the reference.
What changes the answer
Lip outline, absolute fullness, mouth width, and facial size change the effect of a height ratio. For projection, the E-line also moves with the nose and chin; it is not a lip-only judgment.
Use these ranges to ask a better question about proportion—not to grade a face or choose a procedure by number alone. A qualified clinician still needs to examine function, tissue, skeletal structure, and your goals in person.
Connected facial features
Read or start lip proportions & projection discussions · Explore the interactive atlas