Eye Spacing Ratio vs Facial Harmony
The eye spacing ratio calculator and the facial harmony calculator sit in the same facial-proportion family, and both are built from the same two historical drawing rules: the one-eye-width canon and the five-eyes-wide canon. The real difference is scope. The eye spacing calculator isolates the eye relationships — it compares the gap between the eyes with one eye width and with overall face width — while the facial harmony calculator scores three horizontal canons at once and averages them into a single harmony score. Neither tool is a scientific beauty test; both are aesthetic novelties that measure how closely entered measurements follow classical portrait conventions. Choose based on whether you want one relationship isolated or the fuller composite.
What each calculator does
The eye spacing ratio calculator takes three measurements — interocular distance, one eye width, and face width — and reports two unit-free ratios: the eye spacing ratio (interocular distance divided by eye width, ideal 1.00) and the interocular-to-face ratio (interocular distance divided by face width, ideal 0.20). Its worked example uses an interocular distance of 3.2, an eye width of 2, and a face width of 11.1, giving ratios of 1.60 and about 0.29, both above the classical ideals.
The facial harmony calculator takes those three measurements plus nose width and mouth width, then scores three ratios: the one-eye-width spacing, mouth width divided by nose width against an ideal of 1.5, and face width divided by five eye widths against an ideal of 1.0. Each ratio gets a closeness score from 0 to 100, and the harmony score is the simple average of the three.
Side-by-side comparison
| Feature | Eye Spacing Ratio Calculator | Facial Harmony Calculator |
|---|---|---|
| Question answered | How do the eyes’ spacing compare with the one-eye-width and five-eyes-wide canons? | How closely do three horizontal proportions match the neoclassical canons? |
| Inputs | Interocular distance, one eye width, face width | Interocular distance, one eye width, face width, nose width, mouth width |
| Eye-width spacing check | Direct ratio vs ideal 1.00 | One of three scored ratios, ideal 1.0 |
| Five-eyes-wide check | Interocular-to-face ratio vs ideal 0.20 | Face width / (5 × eye width), ideal 1.0 |
| Additional canon | None | Mouth-to-nose width, ideal 1.5 |
| Output | Two raw ratios | Three closeness scores averaged into a harmony score |
When to use which
Use the eye spacing ratio calculator when the question is specifically about the eyes: how the interocular gap compares with a single eye width and with face width, with both ratios shown plainly against their classical ideals. Use the facial harmony calculator when you want the broader composite — the same eye-width spacing plus the mouth-to-nose and five-eyes-wide canons rolled into one score — or when you already have all five measurements. In both tools, landmark choice is the largest source of error: measure from the same straight-on photo, keep every value in the same unit, and avoid close wide-angle selfies, which distort width relationships. Remember that both tools describe only the values you enter; a low score or wide ratio means the measurements differ from three specific historical rules, not that anything is wrong with the face.
Where to start
- Eye spacing ratio calculator — isolates the one-eye-width and five-eyes-wide checks with two raw ratios.
- Facial harmony calculator — scores three neoclassical horizontal canons and averages them into a harmony score.
Informational note: This page is an educational comparison. Both calculators are aesthetic novelties based on historical portrait canons, not scientific or medical assessments of beauty, attractiveness, health, or symmetry. Results reflect only the measurements you enter and the landmark choices you make.