BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see your category.
About this tool
Body Mass Index is a simple screening measure that relates weight to height. It is calculated as weight in kilograms divided by height in meters squared, and it gives a quick indication of whether weight falls in a range associated with good health outcomes.
BMI has well known limitations: it does not distinguish muscle from fat, and healthy ranges can differ by age and ethnicity. Treat the result as a starting point for a conversation with a healthcare professional, not a diagnosis.
Frequently asked questions
What are the standard BMI categories?
Under 18.5 is underweight, 18.5 to 24.9 is the healthy range, 25 to 29.9 is overweight, and 30 or above is classified as obese.
Is BMI accurate for athletes?
Often not. Muscle is denser than fat, so muscular people can register a high BMI while carrying very little body fat.