Gonial Angle Calculator

The angle at each corner of your jaw on a front-on photo, both sides reported. The clinical gonial angle is measured from the side, so this is a front-view measurement in its own right, not a stand-in for an X-ray.

Choose one clear, front-on photo

Looking at the camera, even light, hair off your forehead, no glasses.

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JPG, PNG or WebP up to 10 MB, or drag one here

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Jaw corner angle, front view

Add a photo and this fills in.

Left side: not yet
Right side: not yet
Difference between them: not yet

Typically no published norm exists for the front view; compare photos of yourself taken the same way

Taking the measurement

Take a front-on photo

Square to the camera, chin level, mouth closed, jaw relaxed.
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Measured in your browser. Nothing is uploaded.
Compare like with like

Compare this number with your own earlier photos taken the same way, not with X-ray figures. A large gap between your two sides usually means the head was turned.

A front-on portrait of a young man with two lines meeting at the corner of his jaw, one running up toward the ear and one forward to the chin. — Drawn from the landmarks our own measurement reads off this photo, not placed by hand. It is a generated face, not a real person, and nothing here is a verdict about it.

The gonial angle is the angle at the corner of the jaw, where the vertical branch of the mandible meets the horizontal one. Clinically it is measured from the side. This calculator measures the jaw corner on a front-on photo, both sides, which is useful for comparing your own photos but is not the same number as the clinical angle.

How this is worked out

The vertex

The corner of the jaw, taken from the detected face outline.
The two rays

One running up the side of the face toward the ear, one running forward along the jaw to the chin. The angle between them is the measurement.
Front view, both sides

Reported individually with the difference between them. Because it is the front view, the figure is not comparable with the side-view numbers in the research, and no published norm exists for it.

A worked example

A front-facing photo 1,000 by 1,000 pixels, head level and straight to camera. The positions below are pixels from the top-left corner, read off the photo by the same landmark model the tool runs.

What goes in

Right jaw corner: 300, 760
Right side of the face, level with the ears: 230, 470
Left jaw corner: 715, 770
Left side of the face: 770, 470
Chin: 500, 850

What the tool reports

Jaw corner angle, front view, °: 124.3
Left side, °: 120.8
Right side, °: 127.8
Difference between them, °: 7.0

On each side, the angle is measured at the jaw corner, between the line up the side of the face and the line along the jaw to the chin.
Right: 127.8°. Left: 120.8°.
The average is 124.3°, and the two sides differ by 7.0°.

This is the front-view angle, so compare it with your own photos taken the same way rather than with side-view X-ray figures.

What each measurement is

Reference bands are this tool's own, chosen for the landmarks it uses. Where research reports a figure it is given separately, with the source, because the two are different claims. And each one says what actually moves it, which for most facial measurements is the more useful half.

Jaw corner angle, front view °

Formula: angle at each jaw corner on a front-on photo, between the ray toward the ear and the ray to the chin
Reference: no published norm exists for the front view; compare photos of yourself taken the same way
Research: the clinical gonial angle is measured from the side: on side X-rays, adult averages run from about 117° to 128° depending on the sample, and one study of 448 adults found 126° in men and 128° in women (Tashkandi et al., 2024). A side-profile photo matched the X-ray on average but explained only 42% of the variation between people (Gupta et al., 2022). No study has checked a front-view angle against it

Front view, so it cannot be compared with X-ray figures. Head turn and tilt move it.

What moves it The general consensus in the looksmaxxing community is that a gonial angle around 120° or sharper is the ideal, especially for men. No study has tested that, and the figure describes the side view, not this one. What makes a jaw read as sharp from the front is mostly what sits on the bone: body fat over the jawline comes first. Chewing does not change it: six months of gum three times a day changed neither jaw shape nor masseter thickness in a randomised trial (Jung et al., 2024). The bone changes only with surgery, an adult decision for a maxillofacial surgeon.

Left side °

Formula: angle at the left jaw corner, front view

Right side °

Formula: angle at the right jaw corner, front view

Difference between them °

Formula: left angle − right angle, absolute

Mostly a check on the photograph. A large gap usually means the head was turned.

The gonial angle is the angle at the corner of your jaw. This measures it on a front-on photo, on both sides, and reports the difference between them.

What this number is, and what it isn’t

The clinical gonial angle is measured from the side, usually on an X-ray. That’s where every figure in the research comes from. This calculator reads the jaw corner from the front, which gives a different number for the same jaw, and no study has checked how the two relate.

So read it as a front-view measurement in its own right: good for comparing your own photos taken the same way, and for seeing whether your two sides match. Don’t compare it with X-ray figures. Our gonial angle guide explains how the clinical angle is measured and how far a photo can stand in for it.

The clinical figures, for context

On side X-rays, adult averages run from about 117° to 128°, depending on the sample. In one study of 448 adults, men averaged 126° and women 128°. The difference between men and women is a few degrees, and some studies find it the other way round.

You’ll often see “124° for men, 122° for women” quoted as the standard. We couldn’t trace those exact figures to the source they’re credited to, so we don’t use them.

What reads as a sharp jaw

The general consensus in the looksmaxxing community is that a side-view angle around 120° or sharper is the ideal, especially for men. No study has tested that. What makes a jaw read as sharp, from any angle, is mostly what sits on the bone:

Body fat over the jawline, first. It’s the lever that changes how the jaw looks in weeks rather than years, and the body fat estimate gives you something to track.
Not chewing. Six months of gum three times a day, in a randomised trial, made bite force stronger but changed neither jaw shape nor masseter thickness.
The bone itself changes only with surgery, an adult decision for a qualified maxillofacial surgeon who can examine and image you.

Both sides, and why the difference matters

Facial asymmetry is universal, so a few degrees between your sides is ordinary. A large gap usually means the head was turned when the photo was taken. If it is large, retake it square-on before reading anything into the angles.

Where to go next

The jawline test combines this angle with jaw width and the lower-face proportion. The face shape detector uses the same outline.

References

[1] Tashkandi, N. E., Alnaqa, N. H., Al-Saif, N. M., & Allam, E.. Accuracy of Gonial Angle Measurements Using Panoramic Imaging versus Lateral Cephalograms in Adults with Different Mandibular Divergence Patterns — Journal of Multidisciplinary Healthcare , 2024 . ↩
[2] Gupta, S., Tandon, P., Singh, G. P., Shastri, D., et al.. Comparative assessment of cephalometric with its analogous photographic variables — National Journal of Maxillofacial Surgery , 2022 . ↩
[3] Larrazabal-Moron, C., & Sanchis-Gimeno, J. A.. Gonial angle growth patterns according to age and gender — Annals of Anatomy , 2018 . ↩
[4] Jung, H. J., Hwangbo, N. K., Park, Y., & Ahn, H. J.. Effects of gum chewing training on occlusal force, masseter muscle thickness and mandibular shape: A randomised controlled clinical trial — Journal of Oral Rehabilitation , 2024 . ↩

Frequently asked questions

What is the gonial angle?

The angle at the corner of the jaw, where the vertical branch of the mandible meets the horizontal body. Orthodontists and surgeons measure it from the side, on an X-ray. Our [gonial angle guide](/gonial-angle/) covers what is normal and how it is measured.

What is a normal gonial angle?

On side X-rays, adult averages run from about 117 to 128 degrees depending on the sample; one study of 448 adults found 126 in men and 128 in women. Those are side-view figures, so they do not apply to the front-view number this calculator gives.

Why doesn't this match the clinical gonial angle?

Because it is measured from a different direction. The clinical angle is taken from the side. From the front, the same jaw gives a different number, and no study has checked how the two relate. Even a side-profile photo only loosely tracks the X-ray angle for any one person.

What is the most attractive gonial angle?

The general consensus in the looksmaxxing community is that a side-view angle around 120 degrees or sharper is the ideal, especially for men. No study has tested that. What makes a jaw read as sharp is mostly what sits on the bone, and body fat over the jawline comes first.

Can you change your gonial angle?

Not the bone without surgery, which is an adult decision for a qualified maxillofacial surgeon with real risks. How sharp the jaw looks does change with body fat.

Does chewing gum change the gonial angle?

No. In a randomised trial, chewing gum three times a day for six months made bite force stronger but changed neither jaw shape nor masseter thickness.

Why are my two sides different?

Faces are not perfectly symmetrical, and a turned head exaggerates it. A large difference usually means the photo was not square to the camera.

Does the gonial angle change with age?

It narrows through childhood and the teens, slowing from about 21, then widens again in older adults, more so with tooth loss.

Is this the same as a jawline score?

No. This measures one angle. Our jawline test combines it with jaw width and the lower-face proportion into a definition score.

Is my photo uploaded?

No. Everything is measured in your browser and nothing is sent anywhere.

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