Body Mass Index (BMI) Calculator (WHO & Asian-Indian Consensus Cut-offs)
Calculates BMI (kg/m²) and classifies nutritional/metabolic status under both WHO international and Asian-Indian consensus thresholds.
⚠️ Educational Calculation & Clinical Safety Safeguard: Asian-Indian consensus guidelines define Normal BMI as 18.0–22.9 kg/m², Overweight as 23.0–24.9 kg/m², and Obesity as ≥25.0 kg/m² due to higher cardiometabolic risk. Educational calculations do not replace clinician assessment, patient-specific laboratory monitoring, or institutional prescribing protocols.
Interactive Calculator
Allowed physiological/compounding range: 10 to 300 kg
Allowed physiological/compounding range: 80 to 240 cm
Calculated Output (kg/m²)
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Step-by-Step Mathematical Derivation & Explanation:
Validated Formula & Conversion Rules
BMI (kg/m²) = Weight (kg) / [Height (m)]² where Height (m) = Height (cm) / 100Worked Clinical Example
72 kg, 165 cm (1.65 m): BMI = 72 / (1.65)² = 72 / 2.7225 = 26.45 kg/m² (Overweight by WHO ≥25; Obese Class I by Asian-Indian Consensus ≥25).
Rounding Rules, Assumptions & Source References
- Rounding Rule: Round BMI to 1 or 2 decimal places (kg/m²).
- Clinical Assumptions & Limitations: Validated only within the stated physiological input boundaries. For paediatric, renal (Cockcroft-Gault), and critical-care infusion calculations, always cross-check against official product labelling and institutional guidelines.
- Source References: Indian Pharmacopoeia (IP 2022), National Formulary of India (NFI), British National Formulary (BNF), and NCBI Bookshelf Clinical Pharmacology Compendia.