The 1830s formula on every health form — what it can say, who it misreads, and the better measures, all free.
Body-mass index for adults with the WHO reference bands shown neutrally, plus the substituted formula step by step.
BMI plus an honest read-out of why the index misclassifies muscular athletes, and which measures to use instead.
BMI against the WHO Asian-Pacific reference points (23 / 27.5), which differ from the standard bands.
BMI using the lower Indian cut-offs (23 overweight, 25 obesity) adopted from ICMR and Ministry of Health guidance.
The 'keep your waist below half your height' screen — simpler than BMI and better at flagging central fat.
The 2013 eccentricity-based shape index that went viral in 2024 after JAMA mortality data — computed properly here.
Trefethen's 'New BMI' (1.3 × kg / m^2.5) which corrects the classic formula's bias against tall people.
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