Math
BMI Calculator
Calculate BMI (Body Mass Index) by entering your height and weight. Displays obesity classification, standard weight, and normal weight range.
Result
BMI
{{ result.bmi }}
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| Standard weight (BMI=22) | {{ result.standardWeight }} kg |
| Normal weight range | {{ result.minWeight }} ~ {{ result.maxWeight }} kg |
Tips
- BMI = Weight (kg) ÷ Height (m)²
- WHO classification: BMI <18.5: Underweight, 18.5–24.9: Normal weight, 25–29.9: Obesity Grade 1, 30–34.9: Grade 2, 35–39.9: Grade 3, ≥40: Grade 4.
- Standard weight is derived from BMI=22, which is associated with the lowest disease risk.
- BMI does not account for muscle mass, bone density, or body fat percentage, making it less suitable for athletes with high muscle mass.
Note — The Limits of BMI and the "Overweight Paradox"
BMI (Body Mass Index) was devised by Belgian statistician Adolphe Quetelet in the 1830s. It was originally designed for statistical analysis of populations, not for individual health assessment. It was only adopted as a standard for obesity classification in medicine during the latter half of the 20th century.
Epidemiological studies have frequently reported that people with BMI 25–30 (overweight) have the lowest mortality rates — a phenomenon known as the "obesity paradox." This is especially true for the elderly and patients with heart disease, where some extra weight may be associated with better prognosis. This does not mean "being heavier is healthier" — it is evidence that BMI alone cannot fully describe one's health.
For a more accurate body composition assessment, it is important to combine body fat percentage, waist circumference (an indicator of visceral fat), and muscle mass.