Printed on 2/13/2026
For informational purposes only. This is not medical advice.
Body Mass Index (BMI) is a simple measurement that uses your height and weight to estimate whether you are underweight, normal weight, overweight, or obese. While BMI does not measure body fat directly, it correlates with more direct measures of body fat and is widely used as a screening tool.
Formula: BMI = weight (kg) / height (m)²
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
Calculate your ideal body weight using multiple formulas (Devine, Robinson, Miller, Hamwi). Find a healthy weight range based on your height and sex.
Body MetricsCalculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat and understand your fitness category.
Body MetricsCalculate your body surface area using Du Bois, Mosteller, and Haycock formulas. BSA is used in clinical medicine for drug dosing and medical calculations.
A BMI between 18.5 and 24.9 is generally considered a healthy weight range for most adults. However, BMI is a screening tool and does not directly measure body fat or account for factors like muscle mass, bone density, or ethnicity.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight (kg) / height (m)².
BMI has limitations. It may overestimate body fat in athletes or people with muscular builds, and it may underestimate body fat in older adults who have lost muscle mass. It also does not account for differences in fat distribution.
A BMI of 30 or higher is classified as obese according to the World Health Organization (WHO). Obesity is further divided into Class I (30–34.9), Class II (35–39.9), and Class III (40+).