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478 landmarks
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Upper-lower vermilion balance
Lip ratio test: upper to lower lip calculator
Lip ratio compares the visible height of your upper lip against your lower lip. It is a small measurement with an outsized effect on how the lower face reads, and this free lip ratio calculator is an AI face scan that measures both vermilion heights at the midline.
Free basic reports require no credit card, no account, no password. Your image is never uploaded or stored. Analysis happens in your browser and your session data is cleared when you close or refresh the page.
In short
Lip ratio is upper vermilion height divided by lower vermilion height, measured at the centre of a relaxed mouth. The classical reference is roughly 1 to 1.6, meaning the lower lip is somewhat taller. Facemap measures both directly from 478 3D landmarks.
- 3D landmarks
- 4783D landmarks
- Scan time
- ~20sScan time
- Uploads, runs in browser
- 0Uploads, runs in browser
- No account required
- FreeNo account required
Where it is measured
Lip ratio on the landmark mesh.
The overlay is drawn from the same 478 point MediaPipe landmark set Facemap uses on your own scan, so every caliper, axis and node sits on the exact anatomy the measurement is taken from.
Sample reading, Upper-lower vermilion balance
- Upper vermilion
- 8.2 mm
- Lower vermilion
- 12.9 mm
- Ratio
- 1 : 1.57
- Mouth width
- 51.3 mm
How the scan works
Capture
Guided front-on frame with even light, no upload.
Landmark
478 point mesh placed on your face in real time.
Report
Lip ratio measured, normalised and explained.
What is lip ratio?
The height of the upper vermilion, the pigmented part of the upper lip, divided by the height of the lower vermilion, measured at the midline.
How Facemap measures lip ratio
Facemap takes the vermilion border landmarks at rest and measures both heights vertically at the centre of the mouth, then reports the ratio.
What the typical range looks like
Classical references cite roughly one to one and a half, upper to lower. Measured faces spread widely on either side of that.
How to read your result
The scan asks for a relaxed mouth, because pressing or smiling changes vermilion height immediately and makes readings incomparable.
The lip ratio formula: how we calculate it
Lower vermilion height against upper vermilion height. Landmark numbers are MediaPipe Face Landmarker indices, and every distance is normalised to your own face so camera distance and image size cancel out.
|y(17) - y(14)| / |y(13) - y(0)|
- Landmarks used
- 0, 13, 14, 17
- Reference target
- 1.60
- Tolerance band
- 0.65
Your reading is compared with that published reference on a Gaussian match curve: score = round( 100 x exp( -0.5 x ( (reading - target) / tolerance )^2 ) ), clamped to 1 to 99. Basis for the reference value: commonly cited 1 to 1.6 upper-to-lower lip proportion. The headline Attractiveness Score works differently: all readings are corrected for head angle and expression, weighted by confidence and mapped onto a 1 to 100 scale by a model calibrated against a published research set of more than Facemap scans.
Read the full Facemap methodology, including how the 22 measurement categories combine into your Attractiveness Score.
Lip ratio reference table
Upper to lower lip ratio bands.
- 1 : 1.0Even
Upper and lower vermilion match
- 1 : 1.3Lower dominant
Common measured band
- 1 : 1.6Classical reference
The most cited proportion
- 1 : 2.0+Strongly lower dominant
Pronounced lower lip volume
What the ideal lip ratio actually is
The most cited reference is 1 to 1.6, upper to lower, borrowed from the same classical tradition as the facial proportion. Measured faces spread widely either side of it, and ratios closer to even are common and read as balanced rather than deficient. Facemap reports your figure against the reference without scoring it.
Why expression ruins a lip measurement
Vermilion height changes the moment the mouth moves, so capture conditions matter more here than on any other measurement.
- Keep the mouth closed and relaxed, no smile
- Do not press the lips together or purse them
- Avoid scanning right after eating or drinking hot liquid
- Matte lip products are fine, heavy liner is not
Lip ratio in the context of the lower face
Lips sit inside the lower third, so read your lip ratio next to your facial thirds and gonial angle results. A lower third that reads heavy is often a length or jaw angle effect rather than a lip proportion effect, and the three tools together tell you which.
The lip ratio formula, step by step
The calculator reduces a relaxed mouth to two vertical heights and a single division.
- Locate the vermilion border landmarks at the centre of the mouth
- Measure the height of the upper vermilion at the midline
- Measure the height of the lower vermilion at the midline
- Divide the upper height by the lower height
- Compare the result against the classical 1 to 1.6 reference
Your reading
Measure your lip ratio in about twenty seconds.
The scan runs in your browser. Nothing is uploaded, and free basic reports need no account.
Questions
Lip ratio calculator: frequently asked questions
Should I smile during the scan?
No. Keep your mouth relaxed and closed so the vermilion borders measure consistently.
What is the ideal upper to lower lip ratio?
The classical reference is roughly 1 to 1.6, upper to lower. Measured faces spread widely either side of it and Facemap does not score you against it.
Does lip ratio change over time?
Slowly, with age. Short-term differences in a reading usually come from expression rather than structure.
Does lipstick affect the reading?
Heavy overlining can shift the perceived vermilion border. A bare or lightly made-up mouth gives the cleanest measurement.
Is the lip ratio test free?
Yes. The basic reading is free with no credit card, account or password.
How is the lip ratio formula calculated?
Facemap measures upper vermilion height and lower vermilion height at the centre of a relaxed mouth, then divides the upper figure by the lower one to give the ratio.
Is the lip ratio calculator an AI face scan?
Yes. It runs Google's MediaPipe Face Mesh machine learning model in your browser to place 478 3D landmarks, with nothing uploaded, so the heights come from deterministic geometry rather than a subjective read.
Related tools
Measurements that read alongside lip ratio.
Vertical proportion balance
Facial thirds face scan
The face is divided into three equal vertical zones: hairline to brow, brow to nose base, and nose base to chin. We measure how evenly your landmarks fall within each.
Jawline structure index
Gonial angle face scan
The angle at the back of the jaw, where the lower border meets the posterior border, a core index of lower-face definition.
Every tool