Length / width
Visible forehead-to-chin height divided by cheek-side width.
Facial Ratio Calculator
Upload a front-facing photo to calculate clearly defined ratios for face length, eye spacing, jaw width, nose, mouth and visible vertical balance.
- Canonical ratio directions
- Processed in this browser
- Formula explained for every metric
Free ratio calculator
Choose one clear photo
Drop your portrait here
Use a complete front-facing view with both eyes open and a relaxed mouth.
Your photo is not uploaded during this free calculation.
Documented ratios from this photo
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Each ratio uses the direction shown in its name. Values are not silently inverted, estimated from missing features or presented as medical standards.
1Correct head roll
2Measure documented landmark spans
3Divide only valid positive distances
What do facial ratios describe?
A facial ratio compares one visible landmark distance with another. A ratio is unitless, so it describes proportion rather than physical size in millimeters.
Eye spacing
Inner-eye gap divided by average visible eye width.
Jaw / cheek
Lower-jaw span divided by cheek-side width.
Nose / mouth
Nasal-base span divided by mouth-corner width.
Midface share
Brow-line-to-nose-base span divided by visible face height.
How to read the ratios
The calculator shows the direction and formula for every value. It leaves out feature-dependent ratios when the photo cannot support a reliable calculation.
How is visible midface share calculated?
The calculator divides the corrected span from the eyebrow line to the nose base by the visible forehead-to-chin height.
Why does this tool use nose width divided by mouth width?
This direction matches the Face Atlas calculation engine and report. Showing the reciprocal would duplicate the same relationship in a second form.
Why are some ratios missing?
Eye-spacing ratios require both eyes to be visible. Nose-to-mouth ratios also need a relaxed mouth and clear landmarks. The calculator leaves out unsupported values.
Are these ratios medical measurements?
No. They describe two-dimensional geometry visible in one photograph and are provided for information only.