BMI Calculator
Body mass index with category guidance and metric or imperial units.
ages: 2 – 120
Result
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Enter age, gender, height, and weight, then click Calculate.
BMI is weight divided by height squared. Categories follow WHO adult ranges: underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), obese (≥30).
Metric (kg/cm) or imperial (lbs/ft+in).
Use current measurements.
See BMI value, category, and healthy weight range for your height.
Calculate BMI using metric units.
BMI = 24.9 (upper end of normal range).
Treating BMI as a diagnostic tool
Fix: BMI is a screening metric, not a medical diagnosis.
Using BMI categories for children
Fix: Pediatric BMI uses age- and sex-specific percentiles.
Mixing unit systems
Fix: Always convert all inputs to one system before calculating.
Body mass index with category guidance and metric or imperial units.
ages: 2 – 120
Result
—
Enter age, gender, height, and weight, then click Calculate.