Enter your height and weight to calculate your Body Mass Index and see which standard category it falls into.
BMI is a general screening measure, not a diagnosis. It doesn't account for muscle mass, bone density, or body composition. Consult a healthcare provider for personalized health assessment.
Body Mass Index (BMI) is a simple screening calculation that relates a person's weight to their height, producing a single number used as a general population-level indicator of whether someone falls within a typical weight range. It's calculated as weight in kilograms divided by height in meters squared, and is the same formula used by health organizations worldwide, including the World Health Organization, for population health screening and research.
This calculator accepts either metric (centimeters and kilograms) or imperial (feet, inches, and pounds) input, converting internally so the result is identical regardless of which unit system you use. Once calculated, the result is placed into one of the four standard WHO categories: underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), or obese (30 and above) — the same thresholds used in most standard medical references.
BMI is useful as a quick, standardized reference point, but it has well-documented limitations: it doesn't distinguish between muscle and fat mass, so a very muscular person can show a higher BMI without carrying excess fat, and it doesn't account for factors like bone density, age, sex, or where fat is distributed on the body, all of which matter for actual health risk assessment. For that reason, this tool (like BMI generally) is best used as a general screening reference point rather than a diagnostic tool — a conversation with a healthcare provider is the right next step for a personalized assessment.