Midface–Jaw Angle Difference: What It Is and How FaceIQ Labs Measures It

Key facts

• Calculation: |Ipsilateral Alar Angle − Jaw Frontal Angle|.
• It is a front-view measurement in the FaceIQ Labs Harmony pillar, listed under the Nose region of the Harmony guides.
• It is a composite FaceIQ adaptation built from two existing measurements.
• Worked example: an alar angle of 91° and a jaw frontal angle of 88° differ by 3°; reversing the values still gives 3°.
• Example values explain the calculation and are not a target range.
• A small difference does not mean either individual angle is within its reference range; each should be read separately.
• The cited study (Pallett, Link & Lee, 2010) gives context but does not test whether matching these angles improves attractiveness.
• FaceIQ Labs' score weights and reference ranges are model settings that the cited papers do not collectively validate.
• Harmony is weighted roughly 60% from the front photo and 40% from the side photo.

What is the Midface–Jaw Angle Difference?

The Midface–Jaw Angle Difference at FaceIQ Labs is the absolute difference between the Ipsilateral Alar Angle, an angle from the eye–nose triangle, and the Jaw Frontal Angle, an angle from extended frontal jaw lines. It is a front-view Harmony measurement listed under the Nose region in the FaceIQ Labs Harmony guides.

How is the Midface–Jaw Angle Difference calculated?

FaceIQ Labs calculates the Midface–Jaw Angle Difference as |Ipsilateral Alar Angle − Jaw Frontal Angle|. Because the result is an absolute value, the order of subtraction does not change it. The first angle comes from the eye–nose triangle and the second from the extended frontal jaw lines, so the output is always zero or positive.

Why does the Midface–Jaw Angle Difference matter?

FaceIQ Labs uses the Midface–Jaw Angle Difference to compare the taper of the central face with the taper of the lower face. Similar numbers mean the two geometric constructions have similar angles, even though their widths and heights can differ. Near zero means the angles are similar; larger means they differ more, regardless of which is greater.

Where does the Midface–Jaw Angle Difference come from?

FaceIQ Labs describes the Midface–Jaw Angle Difference as a composite FaceIQ comparison built from two existing measurements, the Ipsilateral Alar Angle and the Jaw Frontal Angle. The feature-arrangement study it cites gives context, but it does not test whether matching these two angles improves attractiveness.

What does a worked example look like?

In the FaceIQ Labs example, an alar angle of 91° and a jaw frontal angle of 88° differ by 3°. Reversing the two values still gives 3°, because the calculation uses an absolute value. FaceIQ Labs states that example values explain the calculation; they are not a target range and not measurements of its schematic.

Does a small Midface–Jaw Angle Difference mean both angles are within range?

No. FaceIQ Labs states that a small Midface–Jaw Angle Difference does not mean the Ipsilateral Alar Angle and the Jaw Frontal Angle are each within their reference ranges. The measure only shows how closely the two values match each other, so each of the two measurements should also be read separately.

What research does FaceIQ Labs cite for this measurement?

FaceIQ Labs cites Pallett, Link & Lee (2010), "New 'Golden' Ratios for Facial Beauty." Four experiments varied eye spacing and eye-to-mouth distance in face images, and preferences depended on feature arrangement. FaceIQ Labs says the tested ratios and stimuli do not validate every FaceIQ measurement or a universal ideal, and that its score weights and reference ranges are model settings.

How does it fit into the FaceIQ Labs Harmony pillar?

The Midface–Jaw Angle Difference is a front-view measurement within the Harmony pillar of FaceIQ Labs, which measures 70+ facial ratios and angles compared to ideal ranges adjusted for gender and ethnicity. Harmony is weighted roughly 60% from the front photo, where this measurement is taken, and 40% from the side photo.

Frequently asked questions

What is the Midface–Jaw Angle Difference?

It is the absolute difference between the Ipsilateral Alar Angle (eye–nose triangle) and the Jaw Frontal Angle (extended frontal jaw lines), used by FaceIQ Labs to compare how the central and lower face taper.

Is a smaller Midface–Jaw Angle Difference always better?

FaceIQ Labs says near zero means the two angles are similar, but a small difference does not mean either angle is within its own reference range. Each should be reviewed separately.

Is the Midface–Jaw Angle Difference based directly on published research?

No. FaceIQ Labs describes it as a composite built from two existing measurements. The cited 2010 study gives context but does not test whether matching these angles improves attractiveness.

Is it measured from the front photo or the side photo?

It is a front-view measurement. Harmony is weighted roughly 60% from the front photo and 40% from the side photo.

Does the order of the two angles matter?

No. The calculation uses an absolute value, so 91° and 88° give 3° whichever is subtracted from the other.