Facial thirds: what they are and how to measure them.

Facial thirds divide the face into three vertical sections: hairline to brow, brow to the base of the nose, and the base of the nose to the chin. In classical proportion, the three sections are roughly equal. Hexum measures your thirds from a single front-facing photo.

By Hexum · Updated November 3, 2026

The three sections

ThirdFromTo
UpperHairlineBrow line
MiddleBrow lineBase of the nose
LowerBase of the noseBottom of the chin

The lower third is often divided further: the upper lip is commonly described as about one third of it and the lower lip and chin as about two thirds.

How to measure your facial thirds

  1. Take a straight-on photo with your head level and your face relaxed.
  2. Mark four horizontal lines: the hairline, the brow line, the base of the nose and the bottom of the chin.
  3. Measure the distance between each pair of lines and compare the three sections.

If the three distances are close to equal, the proportions are considered balanced. Hexum calculates this automatically as one of its 34 metrics.

What facial thirds do and do not tell you

  • It is a guideline, not a rule. The equal-thirds idea comes from classical art. Real faces vary, and attractive faces are often not perfectly equal.
  • The hairline is hard to define. A receding or changing hairline, or a fringe, makes the upper third unclear in a photo.
  • Angle matters. Tilting the head up or down changes the apparent length of each section.

What can change how your thirds look

Your bone structure is mostly fixed, but how the sections look is not. A haircut or a change in hair fullness shifts the upper third. Becoming leaner changes how the lower third looks, and facial hair or grooming changes the chin area. For a consistent reading, always scan with the same angle and hair position.

See how thirds fit with facial symmetry and the other metrics in the looksmaxxing app overview.

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FAQ

Common questions

What are facial thirds?

Facial thirds divide the face into three vertical sections: hairline to brow, brow to the base of the nose, and the base of the nose to the chin. Roughly equal sections are considered balanced.

How do I measure my facial thirds?

Take a straight-on photo, mark the hairline, brow line, base of the nose and chin, then compare the three distances. Hexum measures this automatically from your scan.

Do facial thirds have to be equal?

No. Equal thirds come from classical proportion guidelines. Real faces vary, and many attractive faces are not perfectly equal.

Can you change your facial thirds?

Bone structure is mostly fixed, but hairstyle, hair fullness, facial leanness and grooming change how the sections look.

Why does my hairline make it hard to measure?

The upper third starts at the hairline, so a receding hairline, a fringe or styling can make the starting point unclear and shift the measurement.