Fitness Calculators: Body Mass Index BMI Calculator BMI Calculator To determine body mass index, input your height and weight into the body mass index calculator below. BMI is an easy-to-use calculation designed to assess your relative fitness but it is NOT a calculation of body fat percentage. Input your data below Enter your height: Feet: 1 2 3 4 5 6 7 8 Inches: 0 1 2 3 4 5 6 7 8 9 10 11 Enter your weight: Pounds: Your body mass index: Note: These calculations are based on averages. A BMI of 20-25 is considered good; a higher or lower BMI may increase health risks. Click on a link below to select a different Fitness Calculator Body Fat BMI Caloric Needs Ideal Weight Nutrition Pace Target Heart Rate