Lower Third: What It Measures and How FaceIQ Labs Calculates It

Key facts

• Formula: nose-bottom-to-chin height ÷ hairline-to-chin height × 100
• Front-view measurement in the Harmony pillar, one of FaceIQ Labs' four 0–10 scoring pillars (Harmony, Angularity, Dimorphism, Features)
• Worked example from FaceIQ Labs: a 66-unit lower third in a 180-unit face is 36.7%
• A lower result means a shorter lower face relative to the whole; a higher result means a taller lower face relative to the whole
• The guide does not publish a numeric target range; example values are not targets
• The facial-thirds idea grew out of classical proportion canons and anthropometry; Farkas and colleagues tested nine traditional proportion rules in 1985
• FaceIQ Labs says its score weights and reference ranges are model settings and that the cited papers do not collectively validate its scoring system
• Recommended photo setup: six feet away, back camera at 2x zoom, eye level, even lighting, neutral expression, jaw relaxed and mouth closed naturally
• Harmony is weighted roughly 60% from the front photo and 40% from the side photo

What does FaceIQ Labs' Lower Third measure?

FaceIQ Labs' Lower Third is the height from the bottom of the nose to the bottom of the chin, expressed as a share of total face height. It is a front-view facial-thirds measurement in the Harmony pillar, calculated as nose-bottom-to-chin height divided by hairline-to-chin height, multiplied by 100.

How is the Lower Third calculated, and what is an example?

FaceIQ Labs calculates Lower Third by dividing nose-bottom-to-chin height by hairline-to-chin height and multiplying by 100. In its worked example, a 66-unit lower third in a 180-unit face is 36.7%. The three facial thirds share the same denominator, so together they account for the full face height. FaceIQ Labs states that example values explain the calculation; they are not a target range and are not measurements of its schematic.

What does a higher or lower Lower Third result mean?

On FaceIQ Labs' Lower Third measurement, a lower result means a shorter lower face relative to the whole face, and a higher result means a taller lower face relative to the whole. The lips and chin share this space, so its total height helps explain balance between the upper face and lower face. Separate lip and chin ratios explain how that space is divided.

What is the ideal range for the Lower Third?

FaceIQ Labs' Lower Third guide does not state a numeric ideal range. Its 36.7% figure is only a worked example of the calculation, not a target. FaceIQ Labs says its reference ranges are model settings, and its Harmony pillar compares 70+ facial ratios and angles to ideal ranges adjusted for gender and ethnicity.

Where does the facial-thirds idea behind the Lower Third come from?

FaceIQ Labs' Lower Third comes from the facial-thirds idea, which grew out of classical artistic proportion canons and later anthropometry, the measurement of human form. Farkas and colleagues tested those rules in 1985, examining nine traditional proportion rules against measured faces. FaceIQ Labs uses photographed brow landmarks to divide the face, and notes that classical rules are not universal targets.

Does published research validate FaceIQ Labs' Lower Third scoring?

No. FaceIQ Labs states that the papers it cites explain history or related evidence and do not collectively validate its scoring system. Its score weights and reference ranges are model settings. The cited Farkas 1985 study, which tested nine traditional proportion rules, is described as useful history for facial thirds and width comparisons.

How should I take a photo for an accurate Lower Third reading?

For accurate results, FaceIQ Labs recommends photographing from six feet away with the back camera at 2x zoom, at eye level, with even lighting and a neutral expression. For the Lower Third specifically, keep the jaw relaxed and the mouth closed naturally. A photo cannot establish bite alignment or explain the cause of a taller lower face.

How does the Lower Third fit into the FaceIQ Labs Harmony score?

FaceIQ Labs' Lower Third is one of the front-view facial-thirds measurements in the Harmony pillar, alongside the Top Third and Middle Third guides. Harmony compares 70+ facial ratios and angles to ideal ranges adjusted for gender and ethnicity, is scored 0–10, and is weighted roughly 60% from the front photo and 40% from the side photo.

Frequently asked questions

What is the formula for FaceIQ Labs' Lower Third?

Nose-bottom-to-chin height divided by hairline-to-chin height, multiplied by 100, giving the lower third's height as a percentage of total face height.

Is the Lower Third a front-view or side-view measurement?

It is a front-view measurement, part of the facial-thirds analysis within FaceIQ Labs' Harmony pillar.

What is an example Lower Third calculation?

A 66-unit lower third in a 180-unit face is 36.7%. FaceIQ Labs says example values explain the calculation and are not a target range.

What does a higher Lower Third percentage mean?

A higher percentage means a taller lower face relative to the whole face; a lower percentage means a shorter lower face relative to the whole.

Does FaceIQ Labs claim the Lower Third scoring is scientifically validated?

No. FaceIQ Labs says its cited research explains history or related evidence but does not collectively validate its scoring system, and that its score weights and reference ranges are model settings.

Can a photo explain why my lower face looks taller?

No. FaceIQ Labs notes that a photo cannot establish bite alignment or explain the cause of a taller lower face.