Facial 3rd

The facial 3rd idea divides a front-view face into upper, middle and lower vertical sections. This tool measures those sections from a photo and also shows the five horizontal widths across the face. Colored lines mark each boundary. The browser performs the calculation locally; no image is uploaded. Use the percentages to describe a picture, not to chase a supposedly perfect face.

Vertical thirds and horizontal fifths

A facial 3rd is one share of the selected forehead-to-chin span. Traditional thirds and fifths are drawing conventions: they give names to sections so different distances can be discussed. This tool’s upper section starts at the top face-mesh point, not the real hairline; the middle begins at the brow center and ends under the nose, and the lower reaches the chin.

How a facial 3rd is divided from forehead to chin

The vertical calculation divides the span from the top forehead mesh point to the chin into upper, middle and lower fractions, separated at the brow center and under-nose point. A second table divides cheekbone width into five horizontal segments using both eye corners. The horizontal values describe side-face widths, each eye width and the gap between eyes.

Reading percentages within each span

Equal thirds or fifths are a simple reference often used in sketches, not a medical or aesthetic standard. A 29/34/37 split may look balanced in one person and the same split can read differently in another. Focus on large, repeatable differences and check where the lines landed. A few percentage points can reflect hairline approximation or head pose more than a meaningful structural change.

Imagine hypothetical vertical spans of 100, 120 and 80 pixels. They total 300 pixels, so the facial 3rd display would read about 33%, 40% and 27%. The percentages tell you how the selected span was divided, even if the whole face appears longer in another portrait. They do not say which facial 3rd is attractive. The adjacent five-width table answers a separate horizontal question.

Consider a hypothetical five-width result of 18%, 21%, 22%, 20% and 19% from the photographed right cheek toward the left. These add to the same cheek-to-cheek span; the middle value is the gap between the inner eye corners, not a nose-width measurement. A person can have near-equal vertical facial 3rd values while the eye gap and side-face widths differ. A hairstyle may change the visual framing of those widths without altering the reported landmarks.

Why a facial 3rd can seem short in a photo

A lifted brow changes the brow-center boundary; a raised chin changes the projected lower distance. These can redistribute the percentages without changing the underlying face. When a facial 3rd differs between photos, inspect the brow and under-nose lines first, then the chin point. For general portrait setup, read how to take a photo for a PSL rating.

When equal thirds are only a drawing guide

The vertical and horizontal outputs are two-dimensional fractions, not skull dimensions. Five widths ignore cheek depth, and the vertical divisions depend on this implementation’s endpoint choices. A diagram using a physical hairline or different eye corners may produce other percentages from the same person. Keep the formula attached to any facial 3rd comparison.

One-third and one-fifth are easy sketching references, not separate ideals for men or women; the implementation applies identical divisions to every adult face. Revealing the forehead with a different hairstyle may change the apparent balance of the portrait without turning the mesh point into a hairline. This is a presentation choice, not an instruction to chase exact percentages.

Lower facial 3rd: the 1:2 reference

Inside the lower facial 3rd, a common drawing reference puts the base of the nose to the lips at about one part and the lips to the chin at about two parts. Like equal thirds, it is a sketching guide, not a target. This tool does not measure that split; it reports the whole lower facial 3rd as one share. A low, close camera stretches the lower facial 3rd in selfies, so compare only photos taken at eye level from the same distance.

Pupil-to-lip height is another convention

The midface ratio uses pupils and upper lip rather than brow and nose landmarks, so it answers a different question. The face proportions calculator includes the thirds beside eye spacing and width-to-height numbers. Compare exact start and end points before calling two results inconsistent.

Facial 3rd FAQ

What does the facial 3rd test measure?

It divides estimated face height into three sections and reports each share.

Does the facial 3rd include the real hairline?

No. This tool uses the top of the face mesh as a stand-in.

What are facial fifths?

They are five horizontal segments spanning cheek edges and the eye corners.

Should all three parts be exactly equal?

No. Equal thirds are a sketching convention, not a universal target.

Why does my upper third seem short?

The missing hairline and photo framing can make this estimate shorter than a physical measurement.

Can I compare results from different photos?

Yes, if camera pose, lens and expression are similar and the lines are correctly placed.