# Top Third

Harmony · Front view · Facial Thirds · https://www.faceiqlabs.com/support/harmony/top-third

The height of the forehead as a percentage of the full face.

## What is measured

Calculation: Hairline-to-brow height ÷ hairline-to-chin height × 100

## Why it matters

The forehead frames the eyes and changes how height is distributed across the face. A larger upper third can make the same eyes, nose and jaw occupy a smaller share of the overall outline.

- Lower: the forehead takes up less of the face height.
- Higher: the forehead takes up more of the face height.

## Where the idea comes from

Evidence: Classical proportion. Facial thirds grew out of artistic proportion canons and later anthropometry: the measurement of human form. Farkas and colleagues tested those rules in 1985. FaceIQ uses photographed brow landmarks to divide the face.

## A worked example

If the forehead spans 60 units and the full face 180, the top third is 33.3%. Keeping the full height at 180, a 66-unit forehead would be 36.7%.

Example values explain the calculation. They are not a target range.

## How to read your result

Hairline placement matters. A fringe, a receding hairline or an incorrectly marked brow level can change this result without a change in facial bone structure.

## Research & further reading

These sources explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; the papers do not collectively validate the scoring system.

- Farkas et al. (1985). [Vertical and horizontal proportions of the face: revision of neoclassical canons](https://pubmed.ncbi.nlm.nih.gov/3883374/). Tested nine traditional proportion rules against measured faces. Useful history for facial thirds and width comparisons; classical rules are not universal targets.

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Source: https://www.faceiqlabs.com/support/harmony/top-third · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt