Five segments
Outer contour to outer eye corner, each eye, the gap between the eyes, then the far eye and outer contour, taken along the eye-line axis.
Local proportion tool
Facial Fifths Calculator
The rule of fifths divides face width into five vertical segments of about one eye width each — the horizontal counterpart to the facial thirds. Upload a photo to measure yours, get each segment as a percentage, and see exactly how far each sits from 20%.
Analyze a photo locally →On-device analysis
Measure your facial fifths
Upload a front-facing photo — the five segments are measured from local landmarks in this browser and never uploaded.
Photo stays in this browser
Choose one clear adult portrait
Front-facing, neutral expression, even light. JPG, PNG, WebP, HEIC or HEIF up to 10 MB.
or drag and drop it here
Before you analyze
- 1Use your own photo, or one you have permission to use.
- 2One adult face only. No minors or age estimation.
- 3Results describe this photo, not objective beauty or health.
A typical first run loads about 15 MB of model/runtime files, then the browser caches them. Nothing is submitted to our analysis API.
Loading local face model…
The first run can take a moment. Your photo remains on this device.
We could not analyze this photo
Local mode: the selected image and detected landmarks are held in page memory only and are cleared when you reset or leave.
What it measures
Evidence behind this result
The output is built from inspectable photo geometry and a separate image-quality signal.
Deviation per fifth
Each segment is shown as a percentage of measured face width, against the 20% equal-fifths reference.
Eye spacing
The central fifth is also reported as the classical eye-gap-to-eye-width ratio, where the reference is one eye width.
01Visible landmarks
02Normalized geometry
03Explainable output
Three-step method
How this tool works
Locate
Six landmarks define the five vertical boundaries: the two outer contour points and the four eye corners.
Align
Boundaries are read on the eye-line-aligned axis, so head roll does not stretch one side.
Compare
Each segment is expressed as a percentage of total width and compared with 20%.
478 visible landmarksMediaPipe Tasks Vision 0.10.35Model: float16 v1Runs in browser
Read the shared methodology →Interpret carefully
What the result cannot tell you
01
Width is measured across the visible face contour, not ear to ear, so the two outer fifths read narrower than a tape measure would report.
02
Any head turn makes the near side of the face wider than the far side; the outer-fifth difference is the first place that shows up.
03
Equal fifths is a drawing convention from classical proportion studies. Most measured faces do not match it, and that is not a fault.
04
Left and right describe the photo as you see it, not the sitter's own left and right.
What is the rule of fifths for the face?+
A classical drawing convention that divides face width into five equal vertical parts, each about one eye wide: the outer margin, the eye, the gap between the eyes, the other eye and the other margin.
What is the five eyes rule?+
The same convention described from the eye out: the face is roughly five eye widths across, and the gap between the eyes is roughly one eye width. This page reports both the segment percentages and that eye-gap ratio.
Why are my outer fifths under 20%?+
Because this tool measures the visible face contour rather than ear to ear. The outer segments are systematically narrower than the convention assumes, so read them against each other rather than against 20% alone.
How is this different from facial thirds?+
Thirds divide the face vertically into upper, middle and lower sections. Fifths divide it horizontally. They describe different axes of the same face, which is why the two pages report different numbers.
Keep exploring
View all tools →Related tools
Facial Thirds Calculator
Free facial thirds calculator: upload a photo to measure your upper, middle and lower thirds as percentages and see how far each sits from the 33/33/33 reference.
Open tool →
Facial Ratios Calculator
Free face ratio calculator: upload a photo to measure your facial proportions — thirds, fifths-related eye spacing and feature widths — with an annotated image.
Open tool →
Eye Shape Detector
Estimate almond-like, round-like or narrow-like visible eye geometry from width, opening, tilt and side-to-side agreement.
Open tool →