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Free BMI calculator. Calculate your Body Mass Index using height and weight. Supports imperial and metric units.
Body Mass Index (BMI) is a simple screening measure using height and weight. It does not measure body fat directly. BMI categories: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (30+).
The BMI calculator estimates your Body Mass Index from your height and weight, then places that number into a recognized health category — underweight, normal, overweight, or obese. It works in both imperial and metric units.
It is for adults who want a quick screening estimate of whether their weight falls within a healthy range relative to their height. Coaches, trainers, dietitians, and clinicians also use BMI as a starting point in conversations about general health.
It helps users translate a height and weight pair into a single, comparable number, which makes it easier to track progress over time or compare against population norms. It also flags potential weight-related health risks worth discussing with a healthcare provider.
It answers questions like "Is my current weight within the normal range for my height?", "How far am I from the upper edge of healthy BMI?", and "What does my BMI work out to in metric units?"