Cephalic Index (CI) Calculator
Calculate Cephalic Index = (Biparietal Diameter / Occipito‑Frontal Diameter) × 100. Use same units for both measurements (mm or cm).
Classification ranges shown below are common neonatal/fetal reference categories (may vary by source).
Result
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Reference classification
CI < 75 → Dolichocephalic (long-headed) 75 ≤ CI ≤ 80 → Mesocephalic (normal) CI > 80 → Brachycephalic (short/wide-headed) Formula: CI = (BPD / OFD) × 100 Units must match (mm or cm).
Anthropology / Craniometry — Cephalic Index (Classical)
A concise HTML reference showing the classical anthropological classification of head shape using the Cephalic Index (CI).
Definition
Cephalic Index (CI) = (Maximum biparietal diameter / Maximum occipito‑frontal diameter) × 100. Measurements must use the same units (mm or cm).
Classical classification (craniometry / anthropology)
| Range (CI %) | Term | Meaning |
|---|---|---|
| < 75 | Dolichocephalic | Long-headed (narrow) |
| 75 – 80 | Mesocephalic | Intermediate / average head shape |
| > 80 | Brachycephalic | Short/wide-headed |
Formula & example
CI = (BPD / OFD) × 100 Example: BPD = 140 mm, OFD = 175 mm → CI = (140 / 175) × 100 = 80.0 → Mesocephalic
Usage: This classification is widely used in anthropological and forensic craniometry. Be aware that medical/fetal sonography publications sometimes use slightly different cutoffs.
References / notes
- Classic anthropometric texts (e.g., Martin & Saller) and many population studies use the 75/80 cutoffs.
- For fetal/neonatal cephalic index, published sonography ranges can differ — always check the source if using clinically.
Cephalic Index — Quiz
सिफालिक इंडेक्स — क्विज़
10 MCQs — choose the best answer (A–D)
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