--- title: "Facial Depth to Height Ratio: What FaceIQ Labs Measures" description: "FaceIQ Labs' Facial Depth to Height Ratio divides tragus-to-subnasale distance by nasion-to-sublabiale distance on a side-view photo, as part of its Harmony pillar." canonical: "https://appear.faceiqlabs.com/support/harmony/facial-depth-to-height-ratio" --- # Facial Depth to Height Ratio: What FaceIQ Labs Measures FaceIQ Labs' Facial Depth to Height Ratio is a side-view Harmony measurement that divides ear-to-nose-base distance (tragus to subnasale) by nasal-root-to-chin-fold distance (nasion to sublabiale). A higher value means more depth relative to height. FaceIQ Labs calls it its own photographic construction, not a clinically validated formula, and its guide gives no target range. ## Key facts - Calculation: tragus-to-subnasale distance รท nasion-to-sublabiale distance. - Category in FaceIQ Labs' guides: Harmony, side view, facial profile. - Lower value: less ear-to-base depth relative to the reference height. Higher value: greater depth relative to it. - The height ends at the fold above the chin, not at the bottom of the chin. - The ear and a true side view must be visible in the photo. - Worked example: depth 105 and height 100 give 1.05; height 115 gives 0.91. These are not target values. - It is a FaceIQ photographic construction; the cited Farkas et al. (2005) study does not validate this exact formula or its scoring range. - FaceIQ Labs' Harmony pillar uses 70+ ratios and angles, weighted roughly 60% from the front photo and 40% from the side photo. - Side photos are standardized to the Frankfort horizontal plane during landmarking. ## What does FaceIQ Labs' Facial Depth to Height Ratio measure? FaceIQ Labs' Facial Depth to Height Ratio is a side-view Harmony measurement. It divides the distance from the ear to the nose base (tragus to subnasale) by the distance from the nasal root to the chin fold (nasion to sublabiale), comparing the front-to-back depth of the profile with its vertical span. ## How is the ratio calculated and what do the landmark terms mean? FaceIQ Labs calculates the Facial Depth to Height Ratio as tragus-to-subnasale distance divided by nasion-to-sublabiale distance. In its guides, nasion means the nasal root, subnasale the nose base, and pogonion the most forward chin point. Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark. The schematic labels the distances A (ear to nose base) and B (nasal root to chin fold) and is not drawn to scale. ## What does a higher or lower Facial Depth to Height Ratio mean? In FaceIQ Labs' guide, a lower Facial Depth to Height Ratio means less ear-to-base depth relative to the reference height, and a higher ratio means greater depth relative to that height. The ratio can help describe a deep, compact profile, but both distances are straight segments influenced by all four landmarks. ## Does FaceIQ Labs give an ideal or target value for this ratio? No. FaceIQ Labs' guide for the Facial Depth to Height Ratio publishes no target or ideal range. Its example values, 1.05 and 0.91, only illustrate the arithmetic. FaceIQ Labs states that its score weights and reference ranges are model settings, and its schematic is not an ideal face or a scored result. ## Is the Facial Depth to Height Ratio clinically validated? No. FaceIQ Labs describes the Facial Depth to Height Ratio as its own photographic construction. Clinical profile analysis provides context, but the cited work does not validate this exact landmark formula or its scoring range, and the cited papers do not collectively validate FaceIQ Labs' scoring system. ## What research does FaceIQ Labs cite for this ratio? FaceIQ Labs cites one source for the Facial Depth to Height Ratio: Farkas et al. (2005), 'International anthropometric study of facial morphology in various ethnic groups/races.' It documents variation in facial dimensions across sampled populations. FaceIQ Labs notes that descriptive measurements explain variation but do not establish an attractiveness score. ## How does the worked example calculate the ratio? In FaceIQ Labs' worked example, a depth of 105 units and a reference height of 100 give a Facial Depth to Height Ratio of 1.05. If the height increases to 115 with the same depth, the ratio becomes 0.91. These values only explain the calculation; they are not a target range or measurements of the schematic. ## What does the photo need to show for an accurate reading? FaceIQ Labs' Facial Depth to Height Ratio needs a true side-view photo in which the ear is visible, because it uses the tragus, subnasale, nasion and sublabiale landmarks. The height ends at the fold above the chin, not at the bottom of the chin. FaceIQ Labs standardizes side photos to the Frankfort horizontal plane during landmarking. For accuracy it recommends photos from six feet away with the back camera at 2x zoom, at eye level, with even lighting and a neutral expression. ## How does this ratio fit into the FaceIQ Labs Harmony score? The Facial Depth to Height Ratio is one of the side-view guides in the FaceIQ Labs Harmony pillar, which measures 70+ facial ratios and angles against ideal ranges adjusted for gender and ethnicity. Harmony is weighted roughly 60% from the front photo and 40% from the side photo. This guide does not state a separate weight or reference range for this ratio. ## Which related side-profile measurements does FaceIQ Labs list? - Facial Convexity (Nasion) - Facial Convexity (Glabella) - Total Facial Convexity - Orbital Vector - Interior Midface Projection Angle - Z Angle - Anterior Facial Depth - Eye Protrusion ## Frequently asked questions ### What does FaceIQ Labs' Facial Depth to Height Ratio measure? It divides the tragus-to-subnasale distance (ear to nose base) by the nasion-to-sublabiale distance (nasal root to chin fold) on a side-view photo, comparing facial depth with vertical profile height. ### Is the Facial Depth to Height Ratio clinically validated? No. FaceIQ Labs calls it its own photographic construction. The cited Farkas et al. (2005) study does not validate this exact formula or its scoring range. ### What photo is needed to measure it? A true side-view photo in which the ear is visible, since the ratio uses the tragus, subnasale, nasion and sublabiale landmarks. ### Where does the height measurement end? At the fold above the chin (sublabiale), not at the bottom of the chin. ### What does a higher or lower ratio mean? A lower ratio means less ear-to-base depth relative to the reference height; a higher ratio means greater depth relative to that height. ### Is the example value of 1.05 a target? No. The values 1.05 and 0.91 only illustrate the calculation and are not a target range. ## Pages on this host This is one page of several on this host. 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