Healthy values sit between 90° and 110°, with women a few degrees above men on average. Studied means vary by ethnicity: 97.9° in Turkish males, 104.3° in Han Chinese males, and roughly 100° to 105° across Indian populations (Çakır et al., 2014), (Bali et al., 2023). There is no single global ideal; the right reference depends on which population the profile belongs to.

Acute (under 90°) means the nose tip points downward relative to the upper lip, which reads as a droopy or under-rotated tip. Values under 80° are classed as a true droopy tip in rhinoplasty practice (Daniel, 2009). Obtuse (over 110°) means the tip rotates too far upward, which reads as over-rotated or pig-nosed. The healthy zone sits between, with the exact target dictated by sex and ethnicity rather than a fixed degree.

Yes. The tip droops with age as the supportive cartilages weaken, which closes the angle progressively. Older patients are often candidates for tip rotation surgery for this reason (Daniel, 2009). The age-related shift is meaningful but small in absolute degrees: most healthy adults stay within a 90° to 110° band well into their seventies.

It is measured on a right-profile photograph between three soft-tissue landmarks: the columella (Col), the subnasale (Sn), and the labrale superius (Ls). The angle reads at Sn, between the line from Col to Sn and the line from Sn to Ls. Modern clinical analyses derive the value from landmark coordinates on a standardised side-profile shot, which is faster and more reproducible than physical calipers on the face.

Yes. Tip rotation surgery is one of the most common moves in cosmetic rhinoplasty, used to lift a droopy tip or to deproject an over-rotated one. The exact target depends on the patient's ethnic phenotype rather than a single textbook degree (Daniel, 2009). Healthy Caucasian noses tend to cluster near the Powell and Humphreys tip-projection ratio of 2.8:1, which is a common reference point Western surgeons aim for (Chatrath et al., 2005).