BMI Calculator
Free Online BMI Calculator
Our free BMI calculator helps you quickly determine your Body Mass Index using either metric or imperial units. Enter your height and weight, and instantly see your BMI value, health category, and the healthy weight range for your height. BMI is one of the most widely used screening tools for assessing whether a person is at a healthy weight relative to their height.
How to Use
Select your preferred unit system (metric or imperial) using the toggle at the top. Enter your weight and height in the appropriate fields, then click the "Calculate BMI" button. Your BMI result will appear below along with your health category and the healthy weight range for your height. The visual scale bar shows exactly where your BMI falls relative to standard health categories.
FAQ
What is BMI?
Body Mass Index (BMI) is a numerical value calculated from your weight and height. It is defined as weight in kilograms divided by the square of height in meters (kg/m²). BMI is used as a simple screening tool to categorize individuals into weight categories: underweight, normal weight, overweight, and obese.
What is a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered to be within the "normal" or healthy weight range for most adults. A BMI below 18.5 is classified as underweight, 25 to 29.9 as overweight, and 30 or above as obese. These ranges apply to adults aged 20 and older.
What are the limitations of BMI?
BMI does not distinguish between muscle mass and fat mass, so athletes or highly muscular individuals may have a high BMI without excess body fat. It also does not account for age, sex, bone density, or fat distribution. BMI should be used as one of several indicators of health, not as a standalone diagnostic tool. Consult a healthcare professional for a complete assessment of your health.