Best Free Body Fat Calculator Online

Body fat percentage is a far more useful health metric than weight alone because it distinguishes between fat mass and lean muscle mass. Our free body fat calculator uses the US Navy circumference method to estimate your body fat percentage from simple tape measurements of your neck, waist, and hips.

Enter your height, weight, and circumference measurements to get your estimated body fat percentage, fat mass in pounds or kilograms, lean body mass, and your fitness category. The calculator classifies your result into essential fat, athlete, fitness, average, or obese ranges based on established health guidelines.

For a well-rounded fitness assessment, pair the body fat calculator with our BMI calculator for weight classification, our ideal weight calculator for goal setting, our waist-to-hip calculator for visceral fat risk, our macro calculator for nutrition planning, and our calorie calculator for energy balance.