Body Composition Tracker

The Body Composition Tracker gives you a detailed breakdown of what makes up your body weight: fat mass, lean mass (muscles, bones, organs), BMI, and hydration percentage. Unlike a simple scale, it helps you understand changes in fat versus muscle — crucial for fitness, weight management, and overall health. The calculations use the US Navy Method for body fat (based on neck, waist, hip and gender) and combine with BMI and estimated water content. Ideal for athletes, gym enthusiasts, or anyone on a wellness journey.

Our tool adapts instantly to metric or imperial units. Simply enter your age, gender, and body measurements. The tracker then estimates body fat percentage, fat-free mass, and total body water (using commonly accepted formulas: for males body fat % = 86.010 * log10(waist - neck) - 70.041 * log10(height) + 36.76; for females = 163.205 * log10(waist + hip - neck) - 97.684 * log10(height) - 78.387). These are validated equations used in health assessments. Lean mass is derived by subtracting fat weight from total weight; hydration is estimated as a percentage of lean mass (about 73%).

Use this tracker weekly to monitor progress. Remember that readings are estimates — always consult a professional for medical advice. The tool is entirely free, with no account needed. Bookmark it for quick access. We continuously refine algorithms to match scientific guidelines. All major devices are supported, and the interface adjusts from mobile to 4K screens. For feedback, visit our Contact Us page. Track smarter, achieve your body composition goals with precision!