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Omrekenen & Gezondheid5 min•2026-10-29•Compute-Hub Health & Fitness Desk
Understanding BMI: Formulas, Health Categories & Limitations
How Body Mass Index is calculated, WHO weight classifications, and what BMI doesn’t tell you.
Key Takeaways
- BMI Formula: Weight (kg) / [Height (m)]² or [Weight (lbs) × 703] / [Height (inches)]².
- WHO Classifications: Underweight (< 18.5), Normal (18.5 – 24.9), Overweight (25 – 29.9), Obese (30+).
- BMI is a screening tool, not a diagnostic measure of body fat percentage or cardiovascular health.
- Athletes with high muscle mass can register as "overweight" despite having very low body fat.
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How BMI is Mathematically Calculated
Body Mass Index evaluates body mass relative to stature. It was devised in the 19th century by Belgian mathematician Adolphe Quetelet to gauge population-level weight trends.
Mathematical Formula:BMI = kg / m²
💡 Practical Real-World Example:An individual weighing 75 kg with a height of 1.78 meters has a BMI of 75 / (1.78 × 1.78) = 23.67, falling within the healthy Normal weight bracket.
Limitations of BMI
BMI does not differentiate between fat mass, lean muscle, bone density, or water retention. Waist-to-hip ratio and body fat calipers provide more nuanced individual assessments.
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Frequently Asked Questions
FAQ: Understanding BMI: Formulas, Health Categories & Limitations
Is BMI different for men and women?
Standard adult BMI categories apply equally to men and women over age 20, though women naturally carry higher essential body fat percentages.
How can I find my healthy weight range?
Use Compute-Hub’s BMI Calculator to see your exact healthy weight range and category.