Calculates Body Mass Index
Total Score
Underweight (< 18.5). Assess for malnutrition, eating disorder, or chronic disease. Nutritional support may be required.
Disclaimer: The clinical scoring and algorithms on this platform are intended strictly for professional informational purposes. They do not constitute a definitive medical diagnosis, treatment, or clinical decision. The final judgment and responsibility lie with the treating physician.
Yasal Uyarı: Bu platformdaki klinik skorlamalar ve algoritmalar yalnızca sağlık profesyonellerini bilgilendirme amaçlıdır. Herhangi bir kesin tıbbi teşhis, tedavi veya klinik karar yerine geçemez. Nihai karar ve sorumluluk hastayı yatak başında değerlendiren hekime aittir.
Body Mass Index (BMI) is a foundational anthropometric tool used to categorize individuals into weight classifications (underweight, normal weight, overweight, and obesity classes I-III). It is widely used in epidemiological studies and clinical screening to identify potential risks for metabolic syndrome, cardiovascular disease, and specific surgical complications.
BMI is a population-level metric, not a direct measure of adiposity. It cannot distinguish between fat mass and muscle mass. Therefore, a highly muscular athlete and a sedentary individual with high central adiposity may have the exact same BMI, despite vastly different metabolic risk profiles.
World Health Organization. Obesity: preventing and managing the global epidemic. Report of a WHO consultation. World Health Organ Tech Rep Ser. 2000;894:i-xii, 1-253.
Disclaimer: The clinical scoring and algorithms on this platform are intended strictly for professional informational purposes. They do not constitute a definitive medical diagnosis, treatment, or clinical decision. The final judgment and responsibility lie with the treating physician.
Use BMI as a first-line population-level adiposity screening tool in adults (≥ 18 years). WHO and NICE obesity management guidelines use BMI as the primary entry criterion: intervention thresholds are ≥ 25 (overweight), ≥ 30 (obesity), and ≥ 35 (considering bariatric surgery with comorbidities). For individuals of Asian ethnicity, the WHO recommends lower thresholds (overweight ≥ 23, obesity ≥ 27.5) due to greater metabolic risk at lower BMI.
BMI systematically misclassifies body composition in two important populations. Athletes and body builders have high muscle mass that elevates BMI into the "obese" range despite low body fat — a Dual-energy X-ray absorptiometry (DEXA) scan is the gold standard for accurate fat mass quantification in these individuals. Conversely, sarcopenic elderly patients may have a normal BMI while carrying dangerous central adiposity and very low muscle mass ("normal-weight obesity"). In these patients, waist circumference (> 94 cm men, > 80 cm women per IDF criteria) or waist-to-height ratio > 0.5 is more predictive of cardiometabolic risk.
Do not use standard BMI thresholds in children and adolescents. Pediatric obesity is defined using age- and sex-specific BMI-for-age percentiles (WHO growth charts for < 5 years; CDC or IOTF references for 5–19 years), not the adult cut-offs of 25 and 30. Applying adult thresholds to children will misclassify their adiposity status and lead to inappropriate counseling.
World Health Organization. Obesity: preventing and managing the global epidemic. Report of a WHO consultation. World Health Organization Technical Report Series. 2000;894:i–253.