BMI calculator
Height + weight → BMI and category. Metric (kg/cm) or imperial (lb/in). Informational only.
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How it works
BMI = weight(kg) / height(m)². Imperial: (703 × lb) / in². Categories follow the common WHO bands (underweight <18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥30).
BMI is a screening number, not a diagnosis — muscle mass and frame change its meaning.
Examples
175 cm, 70 kg → BMI 22.9 (normal) 5 ft 10 in (70 in), 160 lb → BMI 22.9
FAQ
Metric or imperial? Switch units in the dropdown; values are re-read on each run.
Is BMI accurate? Useful for population screening; less meaningful for athletes, children, elderly. Not medical advice.
Height in feet? Convert to inches first (1 ft = 12 in) or use the unit converter.
Pregnant? BMI is not validated for pregnancy; discuss with a clinician.
Stored? No — all math is local.