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BMI Calculator (Adult)
Calculate Body Mass Index for adults. Assess healthy weight range and obesity category.
⚠️ For educational purposes only. Always consult a qualified healthcare professional.
About This Clinical BMI Calculator
This free clinical BMI calculator computes Body Mass Index for adults and provides interpretation of results according to WHO classification standards used in clinical practice.
BMI is used as a screening tool in clinical settings to identify patients who may be at increased risk of weight-related health conditions. While BMI has limitations, it remains a widely used and accessible metric for population-level assessment.
Clinical Interpretation of BMI
WHO BMI classifications: <18.5 Underweight; 18.5-24.9 Normal weight; 25-29.9 Overweight; 30-34.9 Class I Obesity; 35-39.9 Class II Obesity; ≥40 Class III Obesity. Note that Asian populations may have increased health risks at lower BMI thresholds (≥23 overweight; ≥27.5 obese).
Frequently Asked Questions
What are the limitations of BMI in clinical practice?+
BMI does not differentiate between fat mass and lean mass, does not account for fat distribution, and may misclassify muscular individuals as overweight and sarcopenic individuals as normal weight.
What additional measurements complement BMI?+
Waist circumference, waist-to-hip ratio, waist-to-height ratio, and body fat percentage provide additional information about metabolic risk that BMI alone cannot capture.
Is BMI interpreted differently in Asian populations?+
Yes — WHO and many guidelines recommend lower BMI thresholds for Asian populations. Overweight is often defined as ≥23 and obesity as ≥27.5 in Asian adults.
How does BMI relate to cardiovascular risk?+
Elevated BMI is associated with increased cardiovascular risk, but the relationship is complex. Central adiposity (measured by waist circumference) may be a stronger predictor of cardiometabolic risk.
Should BMI be used as a sole diagnostic criterion?+
No — BMI should be interpreted alongside clinical history, physical examination, and other investigations. It is a screening tool, not a diagnostic criterion.