--- title: "What Is the Lower Lip to Upper Lip Ratio in FaceIQ Labs' Harmony Analysis?" description: "FaceIQ Labs' Lower Lip to Upper Lip Ratio compares visible lower-lip height with upper-lip height from a front-view photo. See the formula, how to read it and its limits." canonical: "https://appear.faceiqlabs.com/support/harmony/lower-lip-to-upper-lip-ratio" --- # What Is the Lower Lip to Upper Lip Ratio in FaceIQ Labs' Harmony Analysis? FaceIQ Labs' Lower Lip to Upper Lip Ratio is a front-view Harmony measurement: mouth-seam-to-lower-lip height divided by Cupid's-bow-to-mouth-seam height. Below 1 means the upper lip is taller; above 1 means the lower lip is taller. It shows lip balance, not fullness, and the cited research does not establish one ideal ratio. ## Key facts - Calculation: mouth-seam-to-lower-lip height divided by Cupid's-bow-to-mouth-seam height - Below 1 means the upper lip is taller than the lower lip; above 1 means the lower lip is taller - It is a front-view measurement in the mouth region of FaceIQ Labs' Harmony pillar - It separates relative lip balance from overall lip fullness - Worked example: a 9-unit lower lip and a 6-unit upper lip give 1.5; enlarging both proportionally leaves the ratio unchanged - Lip liner and the Cupid's-bow landmark can change apparent upper-lip height; keep lips gently together without pursing - The cited research (Gibelli et al., 2015) does not establish 1.618 or any single ratio as universally ideal - FaceIQ Labs says its score weights and reference ranges are model settings, and the cited papers do not collectively validate the scoring system - Harmony is one of four pillars (Harmony, Angularity, Dimorphism, Features), each scored 0–10 ## How is the Lower Lip to Upper Lip Ratio calculated? FaceIQ Labs calculates the Lower Lip to Upper Lip Ratio by dividing mouth-seam-to-lower-lip height by Cupid's-bow-to-mouth-seam height. It is a front-view Harmony measurement in the mouth region, based on landmarks placed on the user's photo. Those landmarks can be reviewed and edited with FaceIQ Labs' manual landmark tools. ## What does the Lower Lip to Upper Lip Ratio tell you? FaceIQ Labs' Lower Lip to Upper Lip Ratio shows how visible lip height is split between the lower and upper lips, separate from overall fullness. Below 1, the upper lip is taller; above 1, the lower lip is taller. Two mouths can share the same total lip height but distribute it differently between upper and lower lips. ## What is a worked example of the ratio? In FaceIQ Labs' example for the Lower Lip to Upper Lip Ratio, a lower lip 9 units tall and an upper lip 6 units tall give a ratio of 1.5. Enlarging both lips proportionally leaves the ratio unchanged. The example only explains the calculation; it is not a target range and not a measurement of the schematic. ## Is there an ideal Lower Lip to Upper Lip Ratio? The research FaceIQ Labs cites for the Lower Lip to Upper Lip Ratio does not establish a single ideal. Gibelli et al. (2015) measured lip area, volume and thickness across sex and age groups, describing variation rather than a universal target such as 1.618. FaceIQ Labs says its reference ranges and score weights are model settings. ## What can affect the accuracy of the measurement? Lip liner and the Cupid's-bow landmark can change the apparent upper-lip height used in FaceIQ Labs' Lower Lip to Upper Lip Ratio. FaceIQ Labs advises keeping lips gently together without pursing. For photos generally, it recommends six feet away, back camera at 2x zoom, eye level, even lighting and a neutral expression. ## How does this ratio fit into the Harmony score? FaceIQ Labs' Lower Lip to Upper Lip Ratio is one of the 70+ facial ratios and angles measured under the Harmony pillar, compared with ideal ranges adjusted for gender and ethnicity. Harmony is one of four pillars scored 0–10, alongside Angularity, Dimorphism and Features, and is weighted roughly 60% from the front photo and 40% from the side photo. ## Which other Harmony measurements cover the mouth region? - Lip Thickness - Cupid's Bow Depth - Mouth-to-Nose Width Ratio - Interpupillary-Mouth Width Ratio - Mouth Corner Position - Chin-to-Philtrum Ratio ## Frequently asked questions ### What does a Lower Lip to Upper Lip Ratio above 1 mean? In FaceIQ Labs' Harmony analysis, a ratio above 1 means the lower lip is taller than the upper lip. A ratio below 1 means the upper lip is taller than the lower lip. ### Does the Lower Lip to Upper Lip Ratio measure lip fullness? No. FaceIQ Labs uses it to separate relative lip balance from overall fullness, since two mouths can have the same total lip height but distribute it differently between the upper and lower lips. ### Is there a scientifically ideal lower-to-upper lip ratio? The research FaceIQ Labs cites, Gibelli et al. (2015), describes lip variation by age and sex and does not establish 1.618 or any other single ratio as universally ideal. ### What can throw off my Lower Lip to Upper Lip Ratio? Lip liner and the placement of the Cupid's-bow landmark can change the apparent upper-lip height. FaceIQ Labs advises keeping lips gently together without pursing. ### Which photo is the ratio measured from? It is a front-view measurement in FaceIQ Labs' Harmony analysis, calculated from landmarks on the user's front photo. ## Pages on this host This is one page of several on this host. 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