The BMI calculator estimates body mass index from weight and height using metric or US customary inputs, then maps the score to adult underweight, normal, overweight, and obesity categories based on widely cited WHO thresholds. Results include a compact numeric readout and a vertical gauge that fills the viewport while keeping labels left-aligned for readability.

Enter 82 kg and 1.78 m to obtain a BMI near 25.9, often labeled overweight for adults, or switch to 180 lb and 5 ft 11 in for the same measurement system used on US clinic forms. Copy the formatted index with one click to paste into a fitness log, though coaches may prefer body-fat or waist measures for athletes with higher lean mass.

BMI ignores age, sex, pregnancy, and ethnicity-specific cutoffs used in some clinical guidelines. It is not a diagnosis tool—consult licensed professionals for health decisions. Successful calculations persist inputs locally so you can update weight monthly on the same phone without retyping height.