Alar Width: How It's Measured & Why It Drives Nose Width

Q: What is the average nose width?

Adult averages cluster around 36 mm to 42 mm for alar width (also called nose width), with men about two to three millimetres wider than women in matched populations. Korean adult cone-beam CT data put the female average at 36.7 mm and the male average at 39.3 mm (Lee 2024). Black American noses span 38.8 mm to 42.0 mm across morphological groups (Ofodile 1993). Caucasian samples sit lower, with female alar base averages around 20 to 21 mm in surgical planning data (Springer 2008).

Q: What is the ideal nose width?

The classical aesthetic ideal is that alar width should equal the intercanthal width, the distance between the inner corners of the eyes (Leong 2006). It is the rule of fifths applied to the lower face. In healthy Caucasian noses the actual ratio is wider in 90 percent of subjects, so most real noses do not match the ideal. Among aesthetically rated composite female faces the equality holds in 100 percent of cases (Leong 2006). Treat the ideal as one reference, not a universal target.

Q: Can rhinoplasty reduce nose width?

Yes. Alar base reduction is a separate manoeuvre from dorsal rhinoplasty. It narrows the nostrils through a wedge excision at the nasal sill or alar groove (Cobo 2010). It is reserved for noses with genuine alar flare or excess alar base width, because over-correction leaves a pinched look. In Hispanic and African phenotypes, surgeons often combine alar base reduction with tip projection to keep proportions intact rather than chasing a Caucasian alar-to-intercanthal ratio (Cobo 2010).

How It's Measured

How is the alar width measured?

The alar width is the horizontal distance between the two alar curvature points, the outermost soft-tissue projections on each nostril wing (Leong 2006). On a front-facing photograph, the measurement runs from the right alar landmark (Al-R) to the left alar landmark (Al-L), parallel to the line between the pupils.

Al-R, Al-L: the outermost soft-tissue points of each nasal ala, where the nostril wing meets the cheek.
Reference axis: the horizontal pupillary line. Alar width is measured perpendicular to the facial midline.
Related landmarks: the alar base (Ac-Ac, the points where the nostril meets the face) sits inside Al-Al and is sometimes reported separately in surgical planning.

With nasal length (N-Sn) and tip projection (Sn-Prn), alar width sets the geometry of the nasal base on the lower third of the face.

Alar width measured between Al landmarks on a female frontal portrait — Figure 1
Alar width on this reference subject is **22.1 mm** between the right and left alar landmarks. Same horizontal line and same canvas convention used across the measurement series.

Why It Matters

Why does the alar width matter?

Alar width is one of the biggest single drivers of how a nose reads on the face. The eye does not assess the nose in isolation; it compares the nasal base against the eye spacing on either side of it. The rhinoplasty guideline that follows from this is simple: alar width should equal the intercanthal width (EN-EN), the distance between the inner corners of the eyes (Leong 2006). When EN-EN is shorter than Al-Al, the nose looks wide. When the two are equal, the nasal base sits inside the rule of fifths used in classical facial proportion.

Real anatomy rarely hits that ideal. In a study of healthy adult Caucasian noses, the alar width exceeded the intercanthal width in 90 percent of subjects, against an aesthetic target of equality in 100 percent of attractive composite faces (Leong 2006). The gap widens when the comparison moves outside that reference group. Korean adults averaged 39.3 mm in men and 36.7 mm in women on cone-beam CT (Lee 2024), and Black American noses averaged between 38.8 mm and 42.0 mm across three morphological groups (Ofodile 1993).

The nose width question that drives most searches is not academic. It comes up in rhinoplasty consultations, where reducing alar width by two or three millimetres changes how balanced the lower face looks. Treating the Caucasian ideal as universal misreads non-European nasal anatomy, where wider alar bases are normative rather than a defect. For the actual numbers across populations, see the stat cards and demographic table below.

39 mm

Average alar width, adult men (Korean CBCT)

37 mm

Average alar width, adult women (Korean CBCT)

EN-EN = AL-AL

Classical aesthetic ideal (intercanthal equals alar)

Figure 2

Adult average alar width (Al-Al) in mm. Women run about 2-3 mm narrower than men in matched populations. Values vary by population; ethnic ranges sit below in the demographic table.

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Demographic Variants

Ideal Alar Width by Demographic

Alar width ranges shift with population and sex. The table below lists lit-supported averages alongside the Caucasian aesthetic ideal that pairs alar width with intercanthal distance. Each row links to the paper that established the value.

Demographic	Ideal / typical alar width	Source
Caucasian, female (aesthetic target)	Al-Al equals intercanthal width; ratio approx 1.0	Leong 2006
Caucasian, male (Springer cohort optimum)	Approx 20.8 mm at alar base (Sb-Sb), 36.8 mm at tip	Springer 2008
East Asian, men (Korean CBCT)	39.3 mm average	Lee 2024
East Asian, women (Korean CBCT)	36.7 mm average	Lee 2024
Black American, African group	42.0 mm average at nasal tip (Al-Al)	Ofodile 1993
Black American, Afro-Caucasian group	38.8 mm average at nasal tip (Al-Al)	Ofodile 1993
Black American, Afro-Indian group	41.1 mm average at nasal tip (Al-Al)	Ofodile 1993

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What is the average nose width?

Adult averages cluster around 36 mm to 42 mm for alar width (also called nose width), with men about two to three millimetres wider than women in matched populations. Korean adult cone-beam CT data put the female average at 36.7 mm and the male average at 39.3 mm (Lee 2024). Black American noses span 38.8 mm to 42.0 mm across morphological groups (Ofodile 1993). Caucasian samples sit lower, with female alar base averages around 20 to 21 mm in surgical planning data (Springer 2008).

What is the ideal nose width?

The classical aesthetic ideal is that alar width should equal the intercanthal width, the distance between the inner corners of the eyes (Leong 2006). It is the rule of fifths applied to the lower face. In healthy Caucasian noses the actual ratio is wider in 90 percent of subjects, so most real noses do not match the ideal. Among aesthetically rated composite female faces the equality holds in 100 percent of cases (Leong 2006). Treat the ideal as one reference, not a universal target.

How is alar width measured?

Alar width is measured on a front-facing photograph as the horizontal distance between Al-R and Al-L, the outermost soft-tissue points on each nostril wing (Leong 2006). The line runs parallel to the pupillary axis. Clinicians distinguish this from the alar base width (Ac-Ac), measured at the point where the nostril meets the cheek, which is the cleaner reference for rhinoplasty planning because it ignores nostril flare.

How does nose width compare across ethnicities?

Alar width differs substantially by population. Black American noses average between 38.8 mm and 42.0 mm at the tip across three morphological groups documented by Ofodile (Ofodile 1993). Korean adults average 36.7 mm in women and 39.3 mm in men (Lee 2024). Caucasian surgical optimum data put the alar base at roughly 20 to 21 mm in women (Springer 2008). The Caucasian EN-EN = AL-AL rule does not transfer cleanly to wider nasal phenotypes.

Can rhinoplasty reduce nose width?

Yes. Alar base reduction is a separate manoeuvre from dorsal rhinoplasty. It narrows the nostrils through a wedge excision at the nasal sill or alar groove (Cobo 2010). It is reserved for noses with genuine alar flare or excess alar base width, because over-correction leaves a pinched look. In Hispanic and African phenotypes, surgeons often combine alar base reduction with tip projection to keep proportions intact rather than chasing a Caucasian alar-to-intercanthal ratio (Cobo 2010).

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