Step-by-Step BMI Calculation: Convert Weight/Height, Square Height, Divide

Steps

1. Weight to kg: lbs × 0.4536. (150 lbs → 68.04 kg)
2. Height to meters: inches × 0.0254. (5'10" = 70 in → 1.778 m)
3. Square height: 1.778 × 1.778 = 3.161 m²
4. Divide: 68.04 / 3.161 = 21.5

WHO Categories

• Underweight: <18.5
• Normal: 18.5–24.9
• Overweight: 25–29.9
• Obese: ≥30

Online calculators automate this; ensure correct unit conversion.