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Midface ratio
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The midface ratio shown here is pupil-center spacing divided by the vertical distance from the pupil line to the top of the upper lip. Upload a level front photo to see the two measurement lines and a unitless result. This is the definition commonly used in online face discussions. It is a descriptive photo comparison, not a clinical target or a reason to change your face.
The pupil-to-lip convention
“Midface” can mean different regions in anatomy and art. On this page, the numerator is the pupil-center span, so wider-set pupil landmarks raise the result when height stays fixed. A larger vertical eye-to-lip distance lowers it when width stays fixed. The midface ratio therefore changes in opposite directions with its two inputs; it is not a direct statement about cheekbone depth or a whole middle third.
The two distances in the quotient
The browser levels the face frame before taking the straight distance between two iris centers. It then averages their vertical positions to form a pupil line and measures down to the upper-lip point. This distinction matters: the numerator is a line between pupils, while the denominator is a vertical drop rather than a diagonal eye-to-mouth segment. A misplaced iris or lip point can change the quotient.
Reading values near one
Around 1.0 is commonly cited in online discussions because it means the two chosen distances are similar. That is not a medical standard, population norm or proof of attractiveness. Values from other tools are only comparable if they use the same lip point and pupil centers. A small difference between two photos may be landmark noise or chin angle, not a meaningful facial change.
A hypothetical 60-pixel pupil span over a 60-pixel eye-to-lip height gives a midface ratio of 1.0. So does an 80-pixel span over an 80-pixel height. Equal quotients do not imply equal facial size or identical appearance. If the upper lip rises in a smile, the denominator shortens and the midface ratio rises even when pupil spacing stays still. These examples illustrate the equation, not a target for men or women.
The midface ratio takes its vertical distance from the average pupil line, so a one-eye gaze change can affect both the numerator and denominator. If the iris centers appear unequal in height after the face has been leveled, inspect whether the person was looking sideways or whether one iris landmark landed on glare. The midface ratio does not use the nose as an endpoint. A broad nose or a short chin can affect an observer’s overall impression without changing this specific pupil-to-lip quotient.
Iris and lip placement in photos
The iris centers need to be visible and the upper lip unobstructed. A chin raised toward the camera shortens the projected eye-to-lip height, while a downward gaze can shift detected iris centers. Use a neutral gaze and closed mouth; inspect the cyan pupil line and lip-directed guides before comparing two midface ratio values. For visible pupils and upper lip, read how to take a photo for a PSL rating.
Why one number is not a growth assessment
The pupil-to-lip result does not diagnose maxillary position, facial growth or a condition requiring intervention. It omits lower-face height, cheek depth, symmetry and movement. Claims about one perfect midface ratio overstate what an informal photograph-based measure can support. A nonmedical change such as hair framing may affect the perceived middle face, but it does not change the two distances calculated here.
The code uses no sex input, and a value near one is not a separate male or female reference range. It only says the chosen distances are similar in this projection, as the hypothetical examples show. For a more repeatable midface ratio, keep the mouth at rest and both iris centers visible; the measurement itself offers no target to improve toward.
The brow-to-nose middle third uses other points
The facial 3rd page marks forehead, brow, nose and chin sections instead of pupils and upper lip. The face proportions calculator shows other width and height relationships. Comparing their denominators makes clear why a person can have a particular midface ratio and quite different thirds.
Midface ratio FAQ
How is midface ratio calculated?
Divide pupil-center distance by the vertical pupil-line-to-upper-lip distance in the same leveled photo.
What is an ideal midface ratio?
Around 1.0 is commonly cited online, but it is not a medical or universal beauty standard.
Is mid face ratio the same as facial thirds?
No. Thirds use brow, nose and chin sections; this measure uses pupils and upper lip.
Why does my value change when I tilt my chin?
The projected vertical distance between eyes and lip changes with head pose.
Does a higher ratio mean a better face?
No. It is one descriptive number and cannot grade a whole person.
Are iris landmarks needed?
Yes. If the detector cannot locate them reliably, the page asks for another photo.