Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
Formula: BMI = weight (kg) ÷ (height (m))²
Or in imperial: BMI = 703 × weight (lb) ÷ (height (in))²
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 – 34.9 | Obesity Class I |
| 35.0 – 39.9 | Obesity Class II |
| ≥ 40.0 | Obesity Class III (Severe/Morbid) |
Height (cm) vs Weight (kg). Green = Normal, Blue = Underweight, Yellow/Orange/Red = Overweight/Obese
| Height (cm) | ft/in | Weight (kg) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 | ||
Note: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or body composition. Athletes and elderly individuals may have misleading results.