GLOSSARY · ALL TERMS
Jaw slope, read without alarm.
Jaw slope measures the tilt of the jawline segments running from the chin up to each jaw corner, indicating how square or tapered the lower face contour is.
What it measures
It measures the average angle (from horizontal) of the lower jaw outline from the chin to the visual jaw corner in a straight-on front photo.
How to interpret the angle
A steeper slope (an angle closer to 180 degrees) reads as a more square or pronounced jaw outline. A shallower slope (further from 180 degrees) reads as a more tapered jawline.
What it does NOT measure
This is a front-view visual angle along the skin's silhouette, not the skeletal gonial angle. The true gonial angle requires a side-profile view and landmarks not visible from the front.
When unavailable
If the chin or jaw corners are obscured by a beard or shadow, or if the photo angle distorts the face shape, the reading is marked unavailable instead of guessed.
JAW SLOPE FAQ
Questions about jaw slope.
What is jaw slope?
Jaw slope is the average angle from horizontal of the two jawline segments running from the chin up to each jaw corner, measured from a front photo.
Does a higher angle mean a stronger jaw?
A steeper angle (closer to 180 degrees) indicates a more square or pronounced jaw outline, while a shallower angle indicates a more tapered jaw contour.
Is this the same as gonial angle?
No. Jaw slope is a frontal visual outline measurement. The skeletal gonial angle requires a 90-degree side profile and cannot be accurately measured from a straight-on front photo.
Good photos in, honest readings out.
Informational analysis only — not medical advice. More terms in the glossary.