BMI Calculator
Calculate your Body Mass Index (BMI) to understand where you fall on the weight spectrum. BMI is a simple screening tool that uses your height and weight to estimate body fat and categorize your weight status.
What is Body Mass Index?
Body Mass Index (BMI) is a numerical value calculated from your weight and height. The formula divides your weight in kilograms by your height in meters squared (kg/m²). This measurement has been used since the 1800s as a quick way to assess whether someone is underweight, normal weight, overweight, or obese.
While BMI is widely used in clinical settings and population health studies, it has limitations. It doesn't distinguish between muscle mass and fat mass, meaning athletes with high muscle mass may be classified as overweight despite having low body fat.
BMI Categories
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obesity: BMI 30 or greater
Limitations of BMI
BMI is a useful starting point, but it doesn't tell the whole story about your health. For a more complete picture, consider using our Body Fat Calculator or TDEE Calculator to understand your body composition and energy needs.