TryPSLFree Midface Ratio Calculator
Calculate your midface ratio from a front-facing photo. Compare pupil distance with the straight-line distance from the midpoint between your eyes to the top of your upper lip, then check the marked points.
Upload a photo to calculate your midface ratio
One adult. Front-facing. No beauty filter.
See an example resultIllustrated example · sample numbers
How to read your midface ratio result
In this example, the iris centers are 300 px apart. The straight-line distance from their midpoint to the upper lip point is 288 px. Dividing 300 by 288 gives a midface ratio of 1.04 when rounded, so pupil distance is about 4% longer than midface height.
A calculator that divides the other way would show 288 ÷ 300 = 0.96 for the same face. Both describe the same proportion. Your result shows both numbers so you can compare with other tools.
Try it with your photo- Midface ratio
- 1.04
- Inverse ratio
- 0.96
One line joins the iris centers. The other runs from their midpoint to the center of the upper lip’s top edge. It is vertical in this example because the lip point is directly below the eye midpoint.
Illustration with invented values, for explanation only.
How to measure your midface ratio from a photo
- 01
Take a level photo
Use a clear, front-facing photo with the camera at eye level. Keep your chin neutral, eyes open and lips gently closed.
- 02
Check the three points
Make sure a blue point sits on each iris center and one on the top edge of your upper lip, at its center. Drag any misplaced point, or use Tab and the arrow keys.
- 03
Read both ratios
Read the ratio and the inverse shown below it. Download a result card to compare with another photo taken in the same conditions.
What is the midface ratio, and how is it calculated?
TryPSL calculates midface ratio as pupil distance divided by midface height. We estimate interpupillary distance (IPD) using the two iris centers. Here, midface height is the straight-line distance from their midpoint to the center of the upper lip’s top edge.
Midface ratio = pupil distance ÷ midface height
Detect the landmarks
MediaPipe Face Landmarker locates the two iris centers and the center of the upper lip’s top edge. Detection runs in your browser.
Measure pupil distance
We measure the straight-line distance between the two iris centers in pixels. This estimates the distance between the pupils.
Measure midface height
We measure a straight line from the midpoint between the iris centers to the center of the upper lip’s top edge. The line follows the marked points, so it may be diagonal.
Calculate the ratio
Pupil distance divided by midface height gives the main result. Dividing in the opposite order gives the inverse. Both are rounded to two decimal places.
How to calculate midface ratio by hand
Open a front-facing photo in an image editor. Mark the two iris centers and the center of the upper lip’s top edge. Measure between the iris centers, then draw a straight line from their midpoint to the lip point and measure its length. Divide the first measurement by the second.
Use the same units for both measurements. Pixels are enough. A real-world pupil distance in millimeters cannot be combined with a photo measurement unless you know the photo’s scale.
This is an estimate from a 2D photo and has not been clinically validated. TryPSL’s overall score uses the same ratio definition with a separate head-pose correction, so the numbers may differ. Methodology and limitations
What is a good midface ratio?
A ratio of 1.00 means pupil distance and midface height are equal. Online discussions often describe a higher ratio as a compact midface and a lower one as a long midface, but the labels have no agreed cutoffs. There is no clinically established ideal midface ratio, and this measurement does not rate attractiveness.
Above 1.00
Pupil distance is longer than midface height. The eye-to-lip distance is relatively short for the spacing between your eyes.
Close to 1.00
The two lengths are about equal. Check the marked points before interpreting small differences around 1.00.
Below 1.00
Midface height is longer than pupil distance. This can reflect a longer eye-to-lip distance, closer eye spacing, or both.
Illustrations by TryPSL, drawn at ratios of 1.12, 1.00 and 0.88. Only the measured lengths change; real faces vary in many other ways.
Midface ratio vs other facial ratios
Midface calculators can use different landmarks or divide the measurements in a different order. When the measured distances match, convert between the ratio and its inverse by dividing 1 by the result: 1 ÷ 0.96 is about 1.04.
| Measurement | Formula | A higher value means |
|---|---|---|
| Midface ratio (TryPSL) | Pupil distance ÷ straight-line distance from eye midpoint to upper lip | Shorter midface relative to eye spacing |
| Inverse midface ratio | Straight-line distance from eye midpoint to upper lip ÷ pupil distance | Longer midface relative to eye spacing |
| Facial width-to-height ratio (FWHR) | Cheekbone width ÷ upper eyelids to top of upper lip | Wider face relative to upper-face height |
| Eye separation ratio (ESR) | Pupil distance ÷ cheekbone width | Eyes set wider relative to face width |
| Facial thirds | Hairline to brows, brows to nose base, nose base to chin | Not a single ratio; compares three heights |
In the first two rows, “upper lip” means the center of its top edge. A tool that measures to the base of the nose uses a different distance; taking the inverse will not make those results comparable.
Why your midface ratio changes between photos
Camera angle and expression can change the distances measured in a photo. Keep the setup the same when comparing results.
Chin and camera height
Keep the lens at eye level and your chin neutral. Tilting your head up or down can change the apparent eye-to-lip distance and affect your result.
Camera distance
Hold the camera at least an arm’s length away, or use a timer. Close selfies exaggerate features nearest the lens and can change facial proportions.
Expression
Keep your lips gently closed and your face relaxed. Smiling lifts the upper lip, and squinting can make the iris centers harder to find.
Point placement
Use a sharp original photo without a beauty filter. Check the points on the close-up; glasses, reflections or hair across the eyes can shift an iris center.
A 2018 study in JAMA Facial Plastic Surgery estimated that a photo taken about 30 cm (12 in) from the face makes the nasal base appear around 30% wider than one taken at 1.5 m (5 ft). It shows how camera distance alters facial proportions; it does not validate this calculator.
Midface ratio calculator FAQs
What is the midface ratio?
In this calculator, midface ratio is pupil distance divided by the straight-line distance from the midpoint between the eyes to the center of the upper lip’s top edge. A higher number means a shorter eye-to-lip distance relative to eye spacing.
How do you calculate the midface ratio?
Measure between the two iris centers, then from their midpoint to the center of the upper lip’s top edge. Use straight-line distances in the same units, and divide the first by the second. For example, 300 px ÷ 288 px is about 1.04.
What is a good midface ratio?
There is no clinically established ideal. A ratio near 1.00 is often used as an informal reference online. What the number tells you depends on the formula and the photo.
What do compact and long midface mean?
With the formula used here, compact or short midface refers to a shorter eye-to-lip distance relative to eye spacing. Long midface describes the reverse. These are informal labels with no agreed boundaries.
Why do midface ratio calculators give different results?
Some calculators use the inverse formula or measure to a different point, such as the base of the nose. Point detection and manual adjustments can also affect the result. Check the formula and landmarks before comparing; TryPSL shows both ratios.
How accurate is this midface ratio calculator?
Head angle, camera distance, expression and point placement can all affect the result. We have not established an error margin; the two decimal places are a display choice.
Why does my midface ratio change between photos?
Camera angle, distance and expression can change the distances visible in a photo. A misplaced eye or lip point can also shift the ratio. Keep the camera at eye level and use a relaxed expression when comparing results.
Is the midface ratio the same as facial thirds?
No. Facial thirds compare three sections: hairline to brows, brows to nose base, and nose base to chin. The midface ratio compares eye spacing with the distance from the eye midpoint to the upper lip.
Is the midface ratio different for men and women?
The formula is the same for everyone. This tool does not use separate male and female reference ranges.
Can I move the points?
Yes. Drag a blue point onto an iris center or the top of the upper lip, or use Tab to select it and the arrow keys to move it. Hold Shift for larger steps. Reset points restores the detected positions. Your result card uses the points shown.
Can a midface ratio be changed?
Your result can change with camera angle, expression or point placement. To compare photos over time, keep the setup consistent; the ratio alone cannot confirm a change in facial structure.
Is the midface ratio calculator free and private?
Yes. The tool is free and needs no account. Your photo and measurements stay in your browser and are not sent to our analysis server. Use “Clear & choose another” or reload the page to clear the session.