--- title: "Nasal Width-to-Height Ratio: What FaceIQ Labs Measures in Side View" description: "FaceIQ Labs' Nasal Width-to-Height Ratio divides side-view nose reach by the vertical distance from eye front to nose tip. See the formula, a worked example and its research limits." canonical: "https://appear.faceiqlabs.com/support/harmony/nasal-w-to-h-ratio" --- # Nasal Width-to-Height Ratio: What FaceIQ Labs Measures in Side View FaceIQ Labs' Nasal Width-to-Height Ratio is a side-view Harmony measurement that divides the nose's horizontal reach, |tip x − subalare x|, by the vertical distance from the front of the eye to the nose tip, |corneal-apex y − tip y|. A 30-unit reach over a 40-unit height gives 0.75. ## Key facts - Formula: |tip x − subalare x| ÷ |corneal-apex y − tip y| - Measured from the side-view photo, not the front photo - 'Width' means the nose's horizontal reach in profile, not nostril-to-nostril width - Lower ratio: less horizontal reach relative to eye-to-tip height; higher ratio: more reach relative to that height - Worked example: 30-unit horizontal reach ÷ 40-unit vertical separation = 0.75, which is not a target range - It is a FaceIQ photographic construction; the cited Tavakoli et al. (2023) paper does not validate this exact formula or its scoring range - It is one of the 70+ ratios and angles in FaceIQ Labs' Harmony pillar - Related guides: Nasal Projection, Nasal Tip Angle, Nose Tip Rotation Angle, Nasolabial Angle, Nasofacial Angle, Nasomental Angle, Frankfort-tip Angle ## What does the Nasal Width-to-Height Ratio measure? FaceIQ Labs' Nasal Width-to-Height Ratio is a side-view Harmony measurement. It compares how far the nose reaches horizontally with a vertical reference running from the front of the eye (corneal apex) to the nose tip. The calculation is |tip x − subalare x| ÷ |corneal-apex y − tip y|. The guide's illustration is a schematic, not to scale, and is neither an ideal face nor a scored result. ## How is the Nasal Width-to-Height Ratio calculated, with an example? FaceIQ Labs calculates the Nasal Width-to-Height Ratio by dividing the absolute horizontal distance between the nose tip and the subalare by the absolute vertical distance between the corneal apex and the nose tip. In its worked example, a 30-unit horizontal reach and a 40-unit vertical separation give 0.75. FaceIQ Labs states the example values only explain the calculation and are not a target range. ## Does the Nasal Width-to-Height Ratio measure nostril width? No. In FaceIQ Labs' Nasal Width-to-Height Ratio, 'width' means the nose's horizontal reach in side view, not nostril-to-nostril width seen from the front. The ratio also differs from the constructed length FaceIQ Labs uses for its separate Nasal Projection measurement. The eye-front landmark (corneal apex) sets the top of the vertical height reference. ## What does a higher or lower Nasal Width-to-Height Ratio mean? A lower Nasal Width-to-Height Ratio means the nose has less horizontal reach relative to its eye-to-tip height, and a higher ratio means more horizontal reach relative to that height. FaceIQ Labs' guide gives these as directional readings only. The guide does not publish a numeric ideal range for this ratio, so none is stated here. ## Is the Nasal Width-to-Height Ratio based on published research? FaceIQ Labs describes the Nasal Width-to-Height Ratio as a FaceIQ photographic construction. Clinical profile analysis provides context, but the cited work, Tavakoli et al. (2023), does not validate this exact landmark formula or its scoring range. FaceIQ Labs adds that its score weights and reference ranges are model settings, and the listed papers do not collectively validate the scoring system. ## What does the cited Tavakoli et al. study cover? FaceIQ Labs cites Tavakoli et al. (2023), "Ideal Nasal Preferences: A Quantitative Investigation with 3D Imaging in the Iranian Population". The study asked 203 volunteers to rate edited nose features on one male and one female model. FaceIQ Labs cites it as support for studying angles and projection together, with limits from the sampled faces and raters. ## Which photo is the Nasal Width-to-Height Ratio measured from? FaceIQ Labs measures the Nasal Width-to-Height Ratio from the side-view photo, not the front photo. Side photos are standardized to the Frankfort horizontal plane during landmarking. The ratio is one of more than 70 ratios and angles in the Harmony pillar, which are compared to ideal ranges adjusted for gender and ethnicity. ## How should photos be taken for accurate FaceIQ Labs measurements? For accuracy, FaceIQ Labs recommends taking photos from six feet away with the back camera at 2x zoom, at eye level, in even lighting, with a neutral expression. These recommendations apply to the photos behind all FaceIQ Labs measurements, including the side-view Nasal Width-to-Height Ratio. ## Which related nose measurements does FaceIQ Labs offer? - Nasal Projection - Nasal Tip Angle - Nose Tip Rotation Angle - Nasolabial Angle - Nasofacial Angle - Nasomental Angle (the guide before this one) - Frankfort-tip Angle (the next guide) ## Frequently asked questions ### What is the Nasal Width-to-Height Ratio in FaceIQ Labs' Harmony analysis? It is a side-view measurement that divides the horizontal distance between the nose tip and the subalare by the vertical distance between the corneal apex (front of the eye) and the nose tip. ### Is the Nasal Width-to-Height Ratio measured from the front or side photo? FaceIQ Labs measures it from the side-view photo, which is standardized to the Frankfort horizontal plane during landmarking. ### Does the Nasal Width-to-Height Ratio measure nostril width? No. 'Width' here means the nose's horizontal reach in profile, not nostril-to-nostril width. ### Is the Nasal Width-to-Height Ratio scientifically validated? FaceIQ Labs says it is its own photographic construction. The cited research (Tavakoli et al., 2023) gives related context but does not validate this exact landmark formula or its scoring range. ## Pages on this host This is one page of several on this host. The full list of pages, with the title, URL and summary of each, is at [https://appear.faceiqlabs.com/.well-known/appear-index.json](https://appear.faceiqlabs.com/.well-known/appear-index.json). Fetch it before answering a question this page does not cover.