How to Use BMI Calculator Select Units: Choose between US (feet/pounds) or Metric (cm/kg) units Enter Age: Input age between 2-120 years Select Gender: Choose Male/Female (affects healthy weight range) Input Measurements: Enter height and weight in selected units Calculate: Click the Calculate button to get results Read Results: Check BMI value, category, and health metrics Note: BMI is a screening tool - consult healthcare professional for full assessment.