Brow tilt
The angle of your brow from the inner (head) to the outer (tail) end.
Why it matters
Brow tilt shapes expression and dimorphism — an upward lateral angle is generally flattering.
What brow tilt measures
Brow tilt is the upward angle of the eyebrow as it travels from its inner end (the head, nearest the nose) up toward its arch. In this report it is taken as the angle from the brow head to the highest point of the arch, averaged across both brows and expressed in degrees above horizontal. A positive value means the brow rises as it moves outward; a value near zero means a flat, straight brow; a negative value would mean the brow droops toward its tail.
The shape comes from where brow hair grows over the orbital rim and from the muscles that shape it, so, like brow height, it is partly anatomy and partly grooming. The arch peak itself is captured by a separate metric (brow apex); tilt is about the slope leading up to that peak.
Why it matters perceptually
Brow tilt is a strong contributor to expression. A gentle upward angle tends to read as open and engaged, while a flat or down-tilted brow can look heavier or more severe. It is also one of the more sexually dimorphic features of the upper face: convention, and the Arch Facial Plast Surg 2010 survey behind this metric, associates a flatter brow with a masculine look and a more arched, upward brow with a feminine one.
Because the brow frames the eye, its slope also influences how canthal tilt and eye shape are perceived, so small changes here can shift the overall feel of the eye region more than the raw number alone suggests.
The conventional range and its caveats
The unisex band runs from about +4 to +10 degrees of lateral lift, with a modelled average near +6 degrees. The sex-specific bands keep the dimorphic ordering: roughly +3 to +8 degrees for men (a gentler arch) and +5 to +11 degrees for women (a more arched brow). In this app's rated set more lift tended to track with higher ratings for both sexes, so some upward angle appears generally flattering even though the canon traditionally favours a flatter brow in men.
As always these are conventions, not laws. Naini 2011 and the 2010 survey describe preferences within particular samples; brow shape varies widely with ethnicity, fashion and individual anatomy, and a flat brow is not a flaw. Brow-landmark precision on this mesh is also limited, so a borderline figure should be read loosely.
Reading and changing your own value
A figure inside your band means your brow has the gentle upward slope that is commonly preferred. A value near zero means a straight brow, which can look calm and modern or, to some eyes, a little flat. A negative value means the tail sits lower than the head, which can read as tired or downcast. Re-check with a relaxed forehead first, because raising or lowering the brow changes the measured slope.
Brow tilt is one of the more adjustable upper-face features because so much of it lives in the hair. Shaping the tail and the underside of the brow changes the visible slope, and brow makeup can draw a slightly higher arch. A small amount of lateral lift can also be produced temporarily with botulinum toxin that relaxes the muscle pulling the brow tail down. What grooming cannot do is move the brow ridge or change the direction the hair fundamentally grows, so there is a ceiling on how far the angle can shift without makeup. The honest summary is that a meaningful share of brow tilt is stylable, which is unusual among facial metrics, but the underlying frame is still bone and follicle.
Typical range
~+4 to +10° (lateral lift)
The upward lift of the brow from its medial head to its arch peak. A gentle upward arch is the common convention.
What your reading means
- Typical
- Your brow has a flattering upward angle.
- Less common
- Your brow angle is close to the preferred lift.
- Distinctive
- Your brow runs flat or downward at the tail versus the preferred lift.
How we measured it
We take the angle from the brow head (medial) up to its arch peak, averaged across both brows.
The evidence
Validated direction (more lift tracked higher ratings). Canon favours a flatter brow in men and an arched brow in women (Arch Facial Plast Surg 2010); our data shows some lift helps both. Brow landmark precision is limited.
References
- Desired position, shape, and dynamic range of the normal adult eyebrow (2010). Archives of Facial Plastic Surgery, 12(2), 123-127. Men preferred a lower, flatter brow over the orbital rim; women preferred a higher brow several mm above the rim with a lateral peak.
- Naini, F. B. (2011). Facial Aesthetics: Concepts and Clinical Diagnosis. Oxford: Wiley-Blackwell.