Understanding Your BMI Breakdown
Body Mass Index establishes four primary categories for adults aged 20 and over. Because stature is squared in the denominator, small changes in height produce noticeable shifts in the final score.
Select Your Preferred Units
Toggle between metric measurements (centimeters and kilograms) or imperial standards (feet, inches, and pounds).
Enter Stature & Body Weight
Provide your barefoot height and morning body weight for the most accurate baseline assessment.
Evaluate Target Healthy Range
The tool automatically calculates your personalized healthy weight target (BMI 18.5 – 24.9) based on your height.
World Health Organization Adult Classification Tiers
- Severe Thinness: Below 16.0 kg/m²
- Moderate Thinness: 16.0 – 16.9 kg/m²
- Mild Thinness: 17.0 – 18.4 kg/m²
- Normal / Healthy Weight: 18.5 – 24.9 kg/m²
- Overweight (Pre-obese): 25.0 – 29.9 kg/m²
- Obesity Class I: 30.0 – 34.9 kg/m²
- Obesity Class II: 35.0 – 39.9 kg/m²
- Obesity Class III (Severe): 40.0 kg/m² and above
Clinical Limitations of BMI
BMI is a screening metric, not a comprehensive medical diagnosis. It does not measure body fat percentage, visceral fat around internal organs, or muscular density. Competitive bodybuilders and strength athletes frequently classify as "overweight" or "obese" despite extremely low body fat percentages. Always consult healthcare professionals and consider complementary metrics such as waist-to-hip ratio and lipid panels.